SARAH SEARCH EQUIPMEMT PROVISIONAL MAINTENANCE INSTRUCTIONS (TRANSMITTER-RECEIVER TYPE BR1082)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A000500010001-3
• Release Decision: RIFPUB
• Original Classification: S
• Document Page Count: 57
• Document Creation Date: December 27, 2016
• Document Release Date: September 13, 2012
• Sequence Number: 1
• Publication Date: November 1, 1956
• Content Type: REPORT

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PUBLICATION No PM 1016
DATE
COPY No
November 19D6
SECRET
SARAH
SEARCH EQUIPMENT
PROVISIONAL
MAINTENANCE INSTRUCTIONS
(TRANSMITTER-RECEIVER TYPE BR1082)
ULTRA ELECTRIC LIMITED
LONDON, W.3 ENGLAND
'ci:to C?...:=21 to pat of co fotrocka
Sibf operated from the file It toad bo
?ablated to individaal systematic racial.
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? SARAH SEARCH EQUIAIDENT
Amendment No. 1
to
Ultra Manual Ref. PM1016
PROVISIONAL MAINTENANCE INSTRUCTIONS
Transmitter-Receiver Units Type 11425 & R625
The above manual covers Transmitter-Receiver Unit Type R825 comprising
Transmitter-Receiver Type BR1082 (243 Mc/ s), Power Unit Type BP105 and
Visor Type I3R1081-5.
This Amendment provides information on test frequencies and type numbers
for Transmitter-Receiver Units Type R425 and R625, which operate on
frequencies of 235 Mc/ s and 213. 5 Mc/ s respectively. The data given in the
following tables should be substituted for the corresponding data relating to Type
R825 in the manual.
1. EQUIVALENT FREQUENCIES
Test Frequencies, Mc/ s
Type R825
Type R425
Type R625
243 .. .. ..
.. .. ..
? ?
235
? ?
.. ? .
.. ? .
..
213. 5
241 .. .. ..
.. .. ..
..
233
.. ..
.. ..
.. ..
211. 5
242 .. .. ..
.. ? .
..
234
.. ..
..
.. ..
.
. 212.5
244 .. .. ..
.. .. ? .
..
236
.. ..
..
.. ..
?
. 214. 5
245 ,.. .. ..
.. .. ..
..
237..
.. ..
..
.. ..
215. 5
NOTE :- In Fig. 3, Signal Generator coverage should be 200 'to 250 Mc/ s.
2. EQUIVALENT TYPE NUMBERS
Description Type No. ,
Transmitter-Receiver Unit .. .. .. .. .. . ? R425 .. R625
consisting of:
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Transmitter-Receiver
?
?
?
?
?
?
?
?
?
?
.. BR1042.. BR1062
Power Unit ? ? , ? ? ? . .. ? ? . . BP105. . BP1G5
Visor .',. BR1081-5.. BR1081-5
Sub-assemblies of
Transmitter-Receiver
??
??
??
??
?? ..
. . BR1042 .. BR1062
.Chassis Assembly
??
??
??
.. BR1042-1.. BR1062-1 -
Transmitter Unit
? ?
? ?
? ?
? ? BR1042-7.. BR1062-7
RF/ IF Unit
??
??
??
.. BR1042-30. BR1.062-30
All other sub-assemblies are identical with the corresponding sub-assemblies
of Transmitter-Receiver Type BR1082.
NOTE:- The Chassis Assembly, which carries the main label for the
Transmitter-Receiver, differs from BR1082-1 in Type No. only.
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SARAH SEARCH TRANSMITTER-RECEIVER TYPE BR1082
PROVISIONAL MAINTENANCE INSTRUCTIONS
Contents
Page
Intritidifaion & General Notes .. ? ? 2
CHAPTER :1 - Dismantling & Reassembly.. ? ? 5
CHAPTER 2 - Tests & Adjustments ? ? ? ? ? ? 11
Appendix 1 - Recommended Spare Parts A. 1
Illustrations .
Fig.
Transmitter-Receiver Partly Dismantled (L. H. Side) ..
Transmitter-Receiver Partly Dismantled (R. H. Side):.
Test Rig Connections for Second-line Servicing .
. ?
..
?
? ?
..
? ?
?
.
?
? ?
..
..
1
2
3
Connections for Junction Box Type TJ211 ? ?
? ?
? ?
? ?
?
? ?
?
..
..
3A
Test Circuit for Aerial Switching
? ?
?
? ?
?
? ?
4
Test Point - Oscillator Tuning Circuit..
? ?
? ?
?
?
5
CRT Display - Timebase Correctly Adjusted
. ?
? ?
..
..
6
Timebase Unit Waveforms - Beacon ..
. ?
? ?
? ?
?
? .
?
..
..
7
Timebase Unit Waveforms - Speech . ?
? .
?.
?.
?
? ?
.
..
..
8
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INTRODUCTION8i=GENERAL NOTES
The term second-line servicing" used in this manual may be interpreted thus,
in relation to the SARAH Transmitter-Receiver Unit:-
Maintenance of the equipment to normal operational standards by (a) renewal
of defective sub-assemblies and (b) application of the appropriate tests and adjugt-
ments necessitated by such renewal.
At "first-line servicing" level the Transmitter-Receiver Unit would merely be
renewed as a complete assembly.
To ease the problems of second-line servicing, each section of the Unit has
been designed as a complete sub-assembly which is separately removable from the
main Chassis Assembly. It is nevertheless important to remember that faults are
sometimes created during servicing processes and great care should be taken
when 'removing and fitting sub-assemblies. In particular, the notes marked
CAUTION in the following chapters should be strictly observed.
WARNING: SINCE VOLTAGES OF UP TO 1500V ARE PRESENT IN THE UNIT,
GREAT CARE SHOULD ALSO BE TAKEN WHEN HANDLING THE UNIT WITH THE
SIDE-PANELS REMOVED.
A complete schedule of the sub-assemblies comprising the Transmitter-
Receiver Unit Type R825 (which consists of Transmitter-Receiver Type BR1082
and Power Unit Type BP105) appears in Appendix 1 to this manual.
NOTE: The references in Appendix 1, and all information on tuning procedures,
etc., apply only to a Unit operating on the distress frequency, i. e., 243 Mc/ s +
2 Mc/ s approximately. To cater for Units operating on other frequencies within
the band 200 to 250 Mc/ s, an amendment sheet covering the differences in sub-
assembly references and test procedure will be included in the manual.
Sub-assemblies as supplied by the manufacturer are tested before dispatch
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against a standard Transmitter-Receiver and should require little, if any, adjust-
ment. Permissible power supply tolerances may, however, necessitate some
alignment procedure and this is best confirmed by tests on the complete Transmitter-
Receiver when a new sub-assembly has been fitted.
-NOTE-:_The,.information given in Chapter 2 (TESTS & ADJUSTMENTS) is intended
for the guidance of users in general. Where special arrangements have been
made with particular users involving specific test equipment, Chapter 2 should be
disregarded and reference made to the instructions issued by the appropriate
authority.
The following special notes on particular sub-assemblies should be carefully
read:-
(a) Power Unit Type BP105
The Power. Unit should never be switched on unless it is fully loaded by.
the complete Transmitter-Receiver, with all sub-assemblies connected, or
by the Power Unit Voltage Tester Type QT179. Failure to observe this
precaution may cause capacitor or transformer breakdown, the off-load
voltages being much higher than the working voltages.
(b) Transmitter Unit Type BR1081-7
Particular care should be taken when fitting or refitting, a Transmitter
Unit sub-assembly, to ensure that the tuning control driving dog is correctly
aligned with respect to the quadrant gear on the Transmitter Unit. Incorrect
alignment can result, in the worst case, in fracture of the RF tuning coil
slugs.
(c) Timebase Unit Type BR1081-12
This unit determines the synchronising of the incoming SARAH Beacon
pulses to the CRT timebase, therefore the setting-up instructions in
Chapter 2 should be carefully followed. The setting-up of timebase duration
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should be given particular attention to ensure that signals from all beacons,
irrespective of their coding, will be visible on the CRT trace. For example,
? if too much suppression is applied, an "A"-coded beacon signal may not
appear on the trace. Similarly, if the timebase duration is too short a "D" -
coded beacon signal may be missed.
(d) RF/IF Unit Type BR1082-30
It is emphasised that in the RF/IF Unit the manual tuning and automatic
, tuning are interrelated. Automatic tuning always takes place about the fre-
quency selected on the manual TUNE RX control. The manual control must
therefore be set to the correct mid-frequency, as detailed in Chapter 2,
Section 3, before the function switch is turned to the SEARCH position.
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.;
Chapter
DISMANTLING & REASSEMBLY
The spares listed in Appendix 1 are recommended to meet second-line
servicing requirements.
The instructions given in this Chapter cover separation of the Transmitter-
Receiver Unit into its major sub-assemblies, and subsequent reassembly.
1. SEPARATING THE POWER UNIT FROM THE TRANSMITTER-RECEIVER
(a) Withdraw the six 2 BA screws securing the Power Unit faceplate to the
casing.
CAUTION:- DO NOT ATTEMPT TO REMOVE THE POWER UNIT
WITHOUT USING THE EXTRACTOR TOOIL PROVIDED. SCREW-
DRIVERS OR LEVERS ARE CERTAIN TO DAMAGE THE NEOPRENE
SEALING GASKET.
(b) Fit the extractor tool by Placing the main plate over the Plessey plug
and socket and screwing on the dust covers.
(c) Pull the extractor tool handle down and draw the Power Unit firmly
away from the Transmitter-Receiver.
(d) The Power Unit casing may now be removed, if desired, by undoing
the four 2BA countersunk screws securing it to the rear of the
Transmitter-Receiver casing.
2. REASSEMBLING THE POWER UNIT TO THE TRANSMITTER-RECEIVER
(a) Refit the Power Unit casing (if removed) by inserting and tightening the
four 2BA countersunk screws securing it to the rear of the Transmitter-
Receiver casing. Lock with suitable varnish.
(b) Ensure that the strips of insulating sheeting are in position inside the
Power Unit casing.
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(c) Push the Power Unit gently home, taking care to see that the locating
dowels, if fitted, are aligned with their holes or slots on the 18-way
socket.
(d) Secure by tightening the six 2BA fixing screws. Lock with varnish.
3. REMOVAL OF SIDE-PANELS
NOTE: Renewal of a defective sub-unit of either side-panel is most con-
veniently carried out by renewing the appropriate panel complete as des-
cribed below.
CAUTION:- NEVER PULL ON CONNECTING WIRES TO DISENGAGE
SOCKETS OR DAMAGE WILL CERTAINLY RESULT. USE THE
LOOPS PROVIDED.
(a) Right-hand Side-panel
The RF/IF Unit is attached to the Right-hand Side-panel, which should
be removed as follows:-
(i) Unscrew and withdraw the six cheesehead screws securing the
Side-panel to the main casting. Ease the Side-panel off, taking care
not to damage the neoprene sealing. DO NOT use blades or levers.
DisConnect plug PL201 connecting the Unit to the Chassis Assembly.
Unscrew the retaining ring of the cable-mounte-d coaxial socket on the
RF input lead and disconnect the socket from the plug on the Unit.
(b)J Left-hand Side-panel
The Timebase Unit is attached to the left-hand side-panel, which
should be removed as follows:-
(i) Unscrew and withdraw the six cheesehead screws securing the side-
panel to the main casting. Ease the side-panel off, taking care not to
damage the neoprene sealing. DO NOT use blades or levers.
(ii) Disconnect the plug connecting the unit to the socket on the
Chassis Assembly.
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111P
REMOVAL OF INDIVIDUAL UNITS
The individual units should be removed as follows:-
(a) RF/IF Unit
(0 Remove the Right-hand Side-panel as detailed above.
(ii) Unscrew and withdraw the three special 2BA retaining screws
securing the Unit to the Side-panel.
(iii) Withdraw the Unit in a direction at right-angles to the Side-
panel.
(b) Timebase Unit
(i)
Remove the Left-hand Side-panel as described above.
(ii) Unscrew and remove the two special 2BA retaining screws
securing the Timebase Unit to the side-panel and withdraw the Unit.
(c) Transmitter Unit
. (0 Remove the Lefi-hand Side-panel as described above.
(ii), Withdraw PL401, the twelve-way. plug, from its socket on
the Chassis Assembly and remove the aerial coaxial plug from the
top rear of the main casting.
(iii) Loosen the 4BA hexagonal-headed fixing bolts securing the
Transmitter Unit to the casting, using an angled 4BA flat spanner of
width not exceeding 7/16 in. across the outside of the jaws.
(iv) Turn the Transmitter-Receiver Unit upside down and swing
the rear end of the Transmitter Unit gently outwards until the inner
rear corner is just clear of the bolt.
(v) Draw the Transmitter Unit towards the rear, of the casting
until the driving dog is free and the front fixing bolt clear of the
fixing lug.
(vi) Withdraw the unit sideways.
(d) Cathode-ray Tube
CAUTION:- HANDLE THE TUBE VERY CAREFULLY DURING THIS
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OPERATION, TO AVOID RISK OF DAMAGE TO THE TUBE AND
SOCKET CONNECTIONS. DO NOT ALTER THE POSITION OF THE
RING MAGNETS, IF 'FITTED.
(i) .Unscrew the two spring-loaded 4BA retaining screws and remove
the CRT clamp. Withdraw the socket from the tube.
(ii) Disconnect the post-deflection accelerator lead.
(iii) Gently rotate the tube until the open ends of the shield are access-
ible. Contract the shield by pressing upon it with the fingers until it
clears the centre fixing lug on the main casting and move the tube and
shield carefully backwards to clear the front cushion ring. Withdraw
the tube from the Chassis Assembly.
REASSEMBLY OF INDIVIDUAL UNITS
(a) RF/IF Unit
Place the Unit on the loCating pillars on the Right-hand Side-Panel.
Refit the special 2BA fixing screws and lock with varnish.
(b) Timebase Unit
Secure the Timebase Unit to the Left-hand Side-panel with the two 2BA
-special'screws. Lock with suitable varnish.
(c) Transmitter Unit
(i) Verify that the TUNE TX knob on the front panel is in the fully
? counter-clockwise position, so that the slot in the driving dog points at
"five minutes to five".
(ii) Move the quadrant gear on the Transmitter Unit into full mesh, so
that it is down against the fixing lug and the pin in the collar is at "five
minutes past seven".
(iii) Turn the Transmitter-Receiver Unit upside down and slide the
front (straight) fixing lug between the spacing washer and main casting,
at the sarne time inserting the driving dog on the flexible shaft into the
collar on' the Transmitter Unit.
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(iv) Verify that the TUNE TX knob can' be moved through approximately
330?, thus turning the quadrant Shaft through nearly 900 in its usual arc.
(v) Swing the Transmitter Unit inwards until the bolt enters the fixing
slot. The spacer will now fall into the depression provided.
(vi) Tighten both fixing bolts and lock with varnish
(vii) Reconnect plug PL401. Reinsert the TX AERIAL coaxial plug and
. screw_ home the retaining nut.
(d) Cathode-ray Tube
(i) Position the shield so that the open ends are accessible and push
the tube gently back into place, pressing the shield sufficiently to clear
the centre fixing lug on the main casting. Ease the tube forward until
the front end enters the rubber cushion ring and is as close as possible
to the graticule.
(ii) Reinsert the tube base into the socket. Take care not to move the
Ring Magnets or Seating Ring, if fitted.
(iii) Carry out the adjustment detailed in Chapter 2 Section 8.
(iv) Reconnect the post-deflection accelerator lead.
(v) Refit the clamp and insert the two spring-loaded 4BA retaining
screws.
6. REASSEMBLY OF SIDE-PANELS
(a) Right-hand Side-panel
(i) Reinsert plug PL201 into its socket and reconnect the coaxial
socket to the plug on the RF/IF Unit.
(ii) Refit the Side-panel, ensuring that no leads are trapped. Loop
the coaxial lead around the post-deflection accelerator terminal.
Secure with the six 2BA screws.
(b) Left-hand Side-panel
Ensure that the insulating sheet opposite S502 is in position, reinsert
PL301 and refit the Side-panel. The Timebase Unit cable should be
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placed over the relay housing and under the CRT clamp retaining screws.
Secure the panel with the six 2BA screws.
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Chapter 2
TESTS & ADJUSTMENTS
When a sub-assembly of the Transmitter-Receiver Unit has been renewed, or
removed for any reason, and refitted, appropriate tests should be applied to the
complete Transmitter-Receiver as detailed in the relevant section of this chapter,
and any necessary adjustments made. Each section covers the procedure applic-
able to one particular sub-assembly.
A simple test rig for this purpose is shown diagrammatically in Fig. 3 and
the following list of test equipment is recommended as a minimum:-
1. EQUIPMENT REQUIRED
(a) UHF Signal Generator, frequency coverage to include the range 200 to
250 Mc/ s, with attenuation down to 1i1V. (E. g., Marconi Signal
Generator Type TF801A, Signal Generator Type 53 ref. lOSB/189, or
Signal Generator Type TS-497A/ URR).
(b) Pulse Generator of p. r. f. 10 kc/ s, pulse width 7ps approximately.
(c) Indicator Electrical ref. 10Q/92.
(d) Cathode-ray Oscilloscope.
(e) Two SARAH Beacon Assemblies, one with Coding A (colour coded red),
one with Coding D (colour coded green).
(f) Wavemeter, frequency_ coverage 200 to 250 Mc/ s.
(g) Stop Watch.
(h) Power cable, 6-way (e. g., sextometvin), fitted at one end with a
Plessey Mk IV 6-way free socket, the opposite end being terminated in
flying leads of suitable length for connection to power supplies.
* (j) Audio cable, 6-way (e. g., sextometvin), fitted at one end with a
Plessey Mk IV free plug and at the opposite end with suitable jacks
for connection to the microphone and telephones of the headset.
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. **
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(k) Headset, Tels. and Mic.
Telephone impedance: 100 to 2002
Microphone impedance: 100 to 2002
Three SRIC Sockets, ref. ZA540155.
One plug ref. ZA540151 or ZA540152.
RF cable, 522, (e. g., Uniradio 43), length approximately 3 ft.
Resistor, 1 M2.
Two resistors, 100 k2.
Accumulator or dry cell (2 to 6V).
NOTES:
If Junction Box Type TJ211 is fitted cables (h) and (j) should be re-
placed by Connectors ref. CP1240 and CR1225 respectively. These are
**
normally supplied with installations which incorporate the Junction Box.
A connector suitable for connection to the American-type Receptacle
ref. AN-3102A-14S-2P on the Junction Box 'should also be provided.
See Fig. 3A.
This does not apply when the Junction Box is fitted, since carbon micro-
phones are then used.
SPECIAL NOTE: Some inconvenience i caused by the aerial switching
action during certain adjustments to the Transmitter-Receiver, when a test
signal is injected via the port aerial plug only, as specified in the following
tests. To overcome this, a special Matching Pad (Type No. to be issued
later) is available which converts the single output from the signal generator
into two identical outputs which are injected via the port and starboard plugs
respectively. For Timebase Unit tests only, since no absolute RF sensitivity
figures are required, a dual output can be obtained by connecting a second
SRIC socket, in parallel with the existing socket, to the starboard aerial
plug.
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. PRELIMINARY INSTRUCTIONS
Interconnect the Transmitter-Receiver Unit and Test Equipment as
illustrated in Fig. 3 and make connections as shown to the power and audio
sockets at the rear of the Power Unit Type BP105. If the Junction Box Type
TJ211 is fitted connect as shown in Fig. 3A.
The tests and adjustments required will depend upon the particular sub-
assembly which has been renewed or refitted. For the relevant procedure,
refer to the instructions given under the appropriate section heading below.
3. CHASSIS ASSEMBLY TYPE BR1082-1
When a complete Chassis Assembly has been renewed, tests should be
carried out on the associated RF/IF Unit, the Timebase Unit and the Trans-
mitter Unit as detailed below. Adjustment of the CRT Assembly will also be
required after refitting (see Section 7).
Since the Aerial Switching and automatic tuning circuits are contained
in the Chassis Assembly, the timing of the Aerial Switching should be
adjusted and the receiver tuning tested, in accordance with the following
procedure. All sub-assemblies must be connected before the mains supply
to the Transmitter-Receiver Unit is switched on.
(a) Aerial Switching
The test circuit shown in Fig. 4 is required for adjustment of the Aerial
Switching rates.
(i) Turn the SEARCH/ HOME 'switch of the Trilsmitter-Receiver
to the HOME position and the function switch to the RX B position.
(ii) The six preset controls mounted at the right-hand side of the
Chassis Assembly are identified on a transfer located on the inner
surface of the Right-hand Side-panel. Adjust the HOMING control
(RV152) to obtain unity mark/ space ratio of the waveform shown on
the oscilloscope (30 to 80 milliseconds each side).
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(iii) Turn the SEARCH! HOME switch to the SLOW position.
(w) Turn the function switch \to the XTAL CHECK position and adjust the
GAIN control so that the amplitude of the crystal-controlled pulses is at a
convenient level.
(v) If necessary, adjust the SLOW OFF (RV151) and SLOW ON (RV153)
controls so that each aerial is connected for a period 5 ? 0. 2 seconds in
turn, as shown by the pulse display appearing at the left and right-hand
side of the vertical trace alternately. A stop-watch should be used to
measure the time intervals.
(vi) Turn the SEARCH! HOME switch to FAST and verify that each aerial
is now connected for a period of 0. 3 to 0. 8 sec in turn.
NOTE: No independent adjustment is provided for FAST switching.
(b) Receiver Tuning
Switch on the Signal Generator (connected to the port aerial plug on the
Transmitter-Receiver) and Pulse Generator. Adjust the Signal Generator
and apply a modulation pulse of width 71-L s and p. r. f. 10 kc/ s from the
Pulse Generator, in accordance with the instructions supplied by the
? makers of these instruments.
-Adjust the Signal Generator frequency to 243 Mc/ s and the output level to
approximately 20t1V. Apply the following adjustments and tests to the
Chassis Assembly:-
(i) Turn the SEARCH/HOME switch to the'SLOW position.
(ii) Set the TUNE RX control to its midway position and adjust the GAIN
- -Control to a convenient level. The signal should consist of three pulses,
plus the initiating pulse at the extreme top of the trace.
(iii) If necessary adjust the MANUAL PRESET .(RV156) control for
maximum signal amplitude on the Transmitter-Receiver CRT screen,
readjusting the GAIN control as required to maintain a convenient signal
level.
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(iv) Adjust the Signal Generator frequency to 241 Mc/ s and verify that
it is possible to tune to this frequency by adjustment of the TUNE RX
control near the low frequency end of its travel.
NOTE: The TUNE RX control may actually cover a range greater
than 241 to 245 Mc/ s, thus it may not be necessary to set the control
to the extreme end of its travel.
(v) Adjust the Signal Generator frequency to 245 Mc/ s and repeat the
test given in paragraph (iv) with the TUNE RX control set to the high-
frequency end of its travel.
(vi) Measure and record the anode voltages of V153 (see Fig. 5) corres-
ponding to frequencies of 241 Mc/ s and 245 Mc/ s respectively, as
established by manually tuning the receiver to the Signal Generator
at these frequencies..
(vii) Adjust the Signal Generator frequency to 243 Mc/ s and readjust
the TUNE RX control for maximum signal amplitude.
(viii) Turn the SEARCH! HOME switch to the SEARCH position. The
anode voltage of V153 will now vary cyclically, in synchronism with
the aerial switching, between an upper and a lower limit. Measure
this voltage and record the extreme upper and lower values observed
during the excursion. These values should correspond with the voltages
measured in paragraph (vi) above.
(ix) If the voltage limits are incorrect, adjust the SEARCH. CENTRE
preset control (RV154) and SEARCH WIDTH preset control (RV157) on
the Chassis Assembly (these are identified on the transfer on the
Right-hand Side-panel) to obtain the required voltage sweep.
4. RIGHT-HAND SIDE-PANEL ASSEMBLY TYPE l3R1082-16
Tests after fitting a Right-hand Side-panel Assembly are required to
determine:-
(a) RF Sensitivity
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It is necessary to verify that the receiver tunes over the correct fre-
quency band on both manual and automatic tuning, since the characteristics
of the magnetic reactor (TR252) vary from one RF/IF Unit to another.
Two methods of test are given in this section. The first method provides
a rapid, approximate test for verification of the general performance
standard. Following this, a detailed analytical test is appended for units
which fail the first test, or on which further data is required.
(a) RF Sensitivity - Approximate Test
(i) Switch on the power supply to the Transmitter-Receiver Unit and
allow two minutes for the Unit to stabilise.
(ii) With no signal input to the Transmitter-Receiver, turn the function
switch to the RX B 'position.
(iii) Turn the SEARCH/ HOME switch to the SLOW position.
? (iv) -Turn the GAIN control clockwise and verify that a normal amount
of "grass" appears on the CRT screen.
(v) Adjust the GAIN control so that "grass" just appears on the trace,
? slowly rotate the TUNE RX control and verify that the "grass" varies
slightly as the receiver is manually tuned.
(b) RF Tuning - Approximate Test
(i) Turn the function switch to the XTAL CHECK position and the
SEARCH/HOME switch to the SLOW position.
(ii) Adjust the GAIN control to a convenient level and the TUNE RX
control for maximum signal amplitude, readjusting the GAIN control as
? required.
(iii) The TUNE RX control should now be near its midway position. If
the control is off centre, adjust the oscillator frequency by turning the
tuning slug of L256 (see Fig. 2.) in the required direction until maximum
signal is obtained with the TUNE RX control centred. See Chapter 1
Section 3 (a) for method of removing R. H. SideTpanel. Cover,
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(c) RF Sensitivity - Analytical Test
(i) Turn the function switch of the Transmitter-Receiver to the RX B
position and the SEARCH/ HOME switch to the SLOW position.
? (ii) Adjust the Signal Generator frequency to 243 Mc/ s, and the carrier
level to approximately 20?V.
(iii) Adjust the TUNE RX control on the Transmitter-Receiver for
maximum signal amplitude. Adjust the GAIN control to a convenient
level.
(iv) Reduce the Signal Generator output until the signal pulse amplitude
is twice that of the "grass" on the CRT trace. Note the input required
from the Signal Generator for this output level.
NOTE: The GAIN control setting for this test should be such that "grass"
just appears on the trace.
? (v) Repeat the procedure in paragraphs (iv) and (v) with the Signal
Generator frequency adjusted to 242 Mc/ s and 244 Mc/ s respectively.
(vi) The following sensitivity figures should be obtained at these fre-
quencies:-
243 Mc/ s : input not greater than 6. 3?V
242 Mc/ s : " 9pAT
244 Mc/.s : " 9V
(vii) Transfer the Signal Generator connection from the port aerial plug
of the Transmitter-Receiver to the starboard aerial plug and repeat
the tests for RF Sensitivity given in paragraph (c) above. Sensitivity
figures should be within 1 dB of those obtained in paragraphs (c) (iv)
? and (v).
NOTE: Some allowance has been made in the sensitivity figures for
the degree of mismatch which may occur between the output impedence
of the signal generator and the input impedance of the SARAH receiver
(nominally 522). In practice, the figures quoted should be met with
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signal generators designed to match into loads of any impedance between
302and 702.
(d) Frequency Coverage - Manual - Approximate Test
(i) Adjust the Signal Generator frequency to 241 Mc/ s.
(ii) Adjust the TUNE RX control on the Transmitter-Receiver for
maximum signal on the CRT. The signal pulses should show no visible
distortion.
(iii) Repeat this procedure with the Signal Generator frequency/adjusted
to 245 Mc/ s.
(e) Frequency Coverage - Automatic - Approximate Test
(i) Set the TUNE RX control to its midway position, corresponding to a
frequency of 243 Me/ s.
(ii) Turn the SEARCH! HOME switch to the SEARCH position.
(iii) Adjust the Signal Generator frequency to 241 Mc/ s.
(iv) Verify that the pulse signal just reaches peak amplitude and is then
s? witched to the opposite side at a rate of approximately twelve times per
minute. Slightly vary the setting of the Signal Generator frequency con-
trol to ensure that the peak signal is actually reached at 241 Mc/ S.
(v) Repeat the above procedure with the Signal Generator frequency
adjusted to 245 Mc/ s.
If the Transmitter-Receiver Unit fails to -meet these tests, remove the
? Right-hand Side-panel as detailed in Chapter 1, leaving the RF and power
cables connected, and readjust the RF Tuning as detailed below.
(f) Adjustment of RF Tuning - Analytical Test
(0 Adjust the Signal Generator frequency to 243 Mc/ s at a carrier level
of between 10 and 20pV pulse-modulated by 7gs pulses at 10 kc/s p. r. f.
(ii) Turn the function switch to the RX B position and the SEARCH! HOME
switch to SLOW.
? (iii) The display should take the form of three pulses, plus an initiating
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pulse at the extreme top of the trace. Adjust the GAIN control to
a convenient level and the TUNE RX control for maximum signal
amplitude.
(iv) The TUNE RX control should now be in its midway position.
If the control is off centre, adjust the oscillator frequency by turn-
ing the tuning slug of L256 (see Fig. 2) in the required direction
until maximum signal is obtained with the TUNE RX control
centred.
(v) Adjust the Signal Generator signal to 241 Mc/ s, tune the
receiver for maximum signal and measure the anode voltage of
V153 (see Fig. 5). (This voltage will be approximately 110V, but
will vary considerably from one unit to another.)
(vi) Adjust the Signal Generator frequency to 245 Mc/ s, tune
the receiver for maximum signal and measure the anode voltage
of V153. (This will be approximately 60V.)
(vii) ' Adjust the Signal Generator frequency to 243 Mc/ s and the
TUNE RX control for maximum signal. -
(viii) Turn the SEARCH/ HOME switch to SEARCH. The anode
voltage of V153 will now vary cyclically, in synchronism with
the aerial switching, between an upper and a lower limit. Measure
this voltage and record the extreme upper' and lower values
observed during the excursion. These values should correspond
with the voltages measured in paragraphs (v) and (vi) above.
(ix) If the voltage limits are incorrect, adjust the SEARCH
WIDTH preset control (RV157) on the Chassis Assembly (these
are identified on the transfer on the Right-hand Side-panel) to
obtain the required voltage sweep.
4. ? TIMEBASE UNIT TYPE BR1081-12
Two methods of test after renewing or refitting a Timebase Unit
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? are given in this section. The first is a rapid, approximate method using
two Beacon Assemblies one coded A and the other coded D.
Following this is a more detailed analysis, with instructions for
adjustment of the TRIGGER and CODING controls and, finally, a complete
setting-up procedure for the timebase.
(a) Approximate Test
/With the Test Rig connected as shown in Fig. 3 (and Fig. 3A if
the Junction Box is fitted), carry out the following test procedure:-
(i) Place the two Beacon Assemblies a short distance from the
Transmitter-Receiver, erect the Beacon aerials and pull the
switch plungers forward.
(ii). Switch on the power supply to the Transmitter-Receiver
Unit and allow two minutes for the Unit to stabilise.
(iii) Turn the function switch to the RX B position. Adjust the
TUNE RX control for maximum signal amplitude, and the GAIN
control to maintain the tips of the pulses at the outer vertical lines
of the graticule. ?
? (iv) Verify that the signal from the A-coded Beacon (colour-
coded red) appears on the lowest quarter.of the CRT trace and the
signal from the D-coded Beacon on the uppermost quarter of the
trace. Also verify that both pulses are firmly "locked" i. e.,
that they are stationary on the CRT trace.
(b) TRIGGER control
(i) , Connect the Signal Generator output to the port aerial plug
? on the Transmitter-Receiver. Switch on the Signal Generator 4xid
Pulse Generator.
? (ii) Adjust the Signal Generator frequency to 243 Mc/ s and the
Pulse Generator output accurately to a p. r. f. of 10 kc/s and
7s pulse width.
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(iii). :Adjust the output ,:of the Signal Generator to a convenient level.
Turn. the SEARCIVIIOME,sWitch.on the Transmitter-
Receiver to the SLOW position.. Adjust the TUNE RX control for
.maXimum .signal.amplitude..
:(v). ., Adjust the GAIN control to obtain a:.moderate amount of "grass"
on the. CRT. trace-.,- Reduce the. Signal Generator outputuntil the
-pulse- amplitude is twice that of the "grass"- -
Under these :conditions the ,pulses should be firmly locked.
If ?the pulses appear to free run or slip-, Switch 'off the power supply
to .the Transmitter-Receiver and remove the Left-hand Side-panel
as ;detailed in Chapter-I, le.aving the multiway..plug connected.
.(vii) 'Switch on the power supply and turn :the function switch to
.the TX B pOsition. .:Turn.the GAIN. control fully counter-
-- clockwise.-
,....(Viii)...--;AdjuSt the preset control marked. TRIG on the Timebase
:Unitso that: the timebase just fails to free run.:
(i20,::.-..,-Turn.theifunction switch to .RX B. Increase the gain until
the Signal Generator pulses reappear.above the "grass" and
readjust the: TUNE RX..control_for..maximUm signal.
pulses should now be fully- locked.. ';If: there is still any
sign of instability, readjust the .TRIG control-until satisfactory
locking
(xi) Switch off the power supply and...refittlie_.Side-panel.
(c). ::iTimebaSe Duration, Velocity' and Suppression
S5,vitch
on the .poWer?supplyJO the Transmitter-Receiver.
'Increase-the:Signal Generator output until the pulses reach
-'theouter.verti:CaLlirfeS.-.of...the.'graticule, ;With no "grass" visible
Ori the trace:-.; (Some adjustnient of :the: GAIN'. control will be
necessary to achievethiscondition,.) ?
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(in) Provided that the Pulse Generator has been accurately set to
10 kc/ s at a pulse width of 7s, a correctly-aligned timebase
should show four pulses, including the first pulse at the extreme
top of the CRT trace. The distribution of the pulses down the trace
should correspond with Fig. 6. In addition, when the lowest pulse
is placed midway between the central horizontal cursor lines by
rotation of the SHIFT control, the pointer on the SHIFT control
should be in line with the left-hand mark of the A sector on the
CODING scale. Similarly, when the third pulse from the bottom
of the trace is placed midway between the central horizontal cursor
lines, the pointer should be in line with the right-hand mark of the
D sector on the scale.
(iv) If there is an alignment error of approximately the same
amount in the same direction at each of the above positions,
remove the knob by unscrewing the coin-slotted insert and lifting
off the knob body. Reposition the pointer in line with the correct
mark and refit the knob. Verify the alignment at the opposite end
of the pointer travel.
(v) If the pulse distribution does not conform with that shown
in Fig. 6, switch off the power supply and remove the Left-hand
Side-panel as detailed in Chapter 1. The timebase should now be
set up as detailed in the following sub-section (d).
(d) Setting Up the Timebase
(i) Switch on the power supply to the Transmitter-Receiver
Unit. Adjust the Signal Generator output (modulated by 7tAS
pulses at 10 kc/ s p. r. f.) and Transmitter-Receiver GAIN
control to obtain pulses on the CRT of sufficient amplitude to
reach the outer vertical line on the port side of the trace, with
no "grass" visible on the trace.
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? (ii) Turn the SUPP preset control on the Timebase Unit fully
counter-clockwise (suppression completely removed).
(iii) Set the TB VEL preset and SCAN AMP preset to their mid-
way positions.
(iv) Turn the SUPP preset slowly clockwise until the lowest pulse
is dimmed out, then turn the control back sufficiently just to
brighten Up the lowest pulse.
(v) Adjust the SCAN AMP preset so that the clearance between
the ends of the trace and the top and bottom of the CRT face
respectively is approximately 1/8 in. when the screen is viewed
directly, i. e., without the visor.
(vi) Adjust the TB VEL preset to obtain three pulses on the
trace, not including the initiating pulse visible at the extreme
top of the trace. The third pulse (counted from the bottom of
the trace) should be approximately 1/8 in. from the initiating
pulse at the top of the trace.
(vii) Adjust the SHIFT control on the front panel so that the
bottom pulse is midway between the central horizontal cursor
lines. The pointer of the SHIFT control should now be in line
with the left-hand mark of the A sector of the CODING scale.
If the pointer is out of alignment, reposition it as detailed in
(c) (iv) above.
(viii) Adjust the SHIFT control to bring the third pulse from
the bottom midway between the cursor lines. The pointer
should now be in line with the right-hand mark of the D sector
on the CODING scale. If the pointcr is out of alignment, place
it in line with the right-hand mark and adjust the VERT preset
on the Tirnebase Unit so that the pulse is centred between the
. ' ?
cursor lines.
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(e) Speech Test
(i) Remove the Signal Generator connection from the port
aerial plug on the Transmitter-Receiver and switch off the Signal
Generator.
(ii) Turn the function switch to the RX B position.
Place a SARAH Beacon Assembly which is known to transmit
satisfactory speech signals, near the Transmitter-Receiver.
Erect the Beacon Aerial and pull the switch plunger forward.
(iv) Tune the receiver exactly to the Beacon frequency and turn
the function switch to the RX R/ T position. Verify that satis-
factory speech reception is obtained in the Transmitter-Receiver
headset when the TALK button on the Speech Unit is pressed and
speech modulation is applied to the latter. Switch off the power
supply to the Transmitter-Receiver and refit the Left-hand Side-
panel.
TRANSMITTER UNIT TYPE BR1081-7
Tests after renewing or refitting a Transmitter Unit sub-assembly
are required to determine:-
(a) Crystal Check Performance
(b) Transmitter Frequency and Beacon Output
(c) ? RF Output on Speech
(d) Performance on Speech
(e) ? Transmitter Tuning ?
(f)? Frequency Coverage
This section describes a series of functional tests of the above
items suitable for second-line servicing. ?
Make the Test Rig connections as shown in Fig. 3 (and 3A if the
Junction Box is fitted), but disconnect the Signal Generator from the port
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25
aerial plug, switch off the Signal Generator and connect Indicator Electrical
ref. 10Q/ 92 to the Transmitter plug (coded white on the Transmitter-
Receiver). The Indicator should remain connected for all Transmitter Unit
tests.
(a) Crystal Check Performance
(i) Turn the function switch to the XTAL CHECK position.
(ii) Turn the SEARCH/ HOME switch to the SEARCH position and
tune the receiver, at the same time advancing the GAIN control.
A series of pulses should now appear on the CRT trace.
(b) Transmitter Frequency and Beacon Output
(i) Turn the function switch to the TX B/ TUNE TX position and
adjust the TUNE TX control until an undistorted pulse is obtained
on the CRT trace, adjusting the GAIN control as required to obtain
a reasonable pulse amplitude on the CRT trace.. (The TUNE RX
control should be left in the position set during (a) above.)
(ii) Adjust the TUNE TX control for maximum pulse amplitude.
The white line on the TUNE TX knob should now be in line with
the calibration mark on the front panel. If the knob is out of
alignment, remove it and realign it with the calibration Mark.
(c) RF Output on Speech
(i) Turn the function switch to the TX R/ T position. The
indicator lamp should glow.
(ii) Apply speech modulation by speaking or whistling into the
headset microphone. The Indicator lamp should now glow more
brightly.
(d) Performance on Speech
The following functional test should be made in conjunction with
a SAH Beacon Assembly placed near the Transmitter-Receiver
Unit:
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(i) Erect the Beacon aerial and pull the switch plunger forward.
(ii) Turn the function switch on the Transmitter-Receiver to the
TX R/ T position if no Press to Talk facility is available. Other-
wise, leave the function switch in the RX R/ T position.
(iii) Speech modulation applied via the headset microphone should
be clearly heard in the Speech Unit of the Beacon Assembly when
the LISTEN button is pressed.
(iv) If necessary, carry out the Transmitter Tuning procedure
detailed in (e) below.
(e) Transmitter Tuning
The following procedure should be adopted for tuning the Trans-
mitter Unit accurately to the incoming beacon signal:-
(i) Switch on the test Beacon Transmitter.
(ii) Turn the function switch to the RX B position. Turn the
SEARCH! HOME switch to the HOME position and, with the GAIN
control set to a convenient level, adjust the TUNE RX control
for maximum signal amplitude. Adjust the GAIN control so that
the signal pulses just reach the outer vertical lines of the
graticule.
(iii) Turn the function switch to the TX B/ TUNE TX position
and adjust the TUNE TX control for maximum signal amplitude,
(f)
reducing the gainS as required.
NOTE: A certain amount of deviation in the TUNE TX knob cali-
bration is permissible when a Beacon is used for a functional
test, since the Beacon frequency tolerance is ? 700 kc/s.
Frequency Coverage
The Transmitter frequency range should be 241 to 245 Mc/ s
inclusive. The coverage can be verified by turning the function
switch to the TX R/ T position and measuring the Transmitter
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frequency, at the, extreme ends of the range, on a suitable wave-
meter. The input circuit of the wavemeter should be closely
'coupled to Indicator. Electrical ref. 10Q/ 92.
POWER UNIT TYPE BP105
When a Power Unit has been renewed or refitted, the overall per?
of the Transmitter-Receiver should be verified as detailed in
the appropriate sections above.
If a Power Unit Voltage Tester (Ultra Type QT179) is available,
the Power Unit output voltages under load should be measured before
assembly to the Transmitter-Receiver, as detailed in the instructions
supplied with the Tester.
_ 7. CATHODE-RAY TUBE ASSEMBLY TYPE X854-1000
(a) CRT Adjustment
When an existing CRT Assembly has been refitted, without
removal or disturbance of the Ring Magnets and Seating Ring, or
a new CRT has been fitted which does not require magnetic
correction, the following adjustment will ensure that the tube is
correctly. positioned:-
(i) Insert the tube into its socket and ease into position in the
Chassis Assembly. Do not fit the clamp or post-deflection
accelerator lead (see Chapter I, Section 5 (d) ).
(ii) Switch on the power supply to the Transmitter-Receiver
Unit and allow two minutes for the Unit to stabilise.
(iii) Turn the functionswitch to RX B and the SEARCH/ HOME
switch to SLOW. Adjust the GAIN control to a suitable level
and rotate the TRIG preset control on the Timebase Unit until
the timebase runs freely. Reduce the gain to obtain a trace
free from "grass".
(iv) Rotate,the tube until the trace is aligned with the vertical
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lines of the graticule.
(v) Fit the CRT clamp and connect the post-deflection accelera-
tor lead. Verify that the trace is still vertical.
(vi) Reset the TRIG control as detailed in Section 4 (b) of this
Chapter.
(b) Magnetic Correction
When a new CRT is to be fitted, magnetic centreing of the trace
may be required. This can be determined by the method detailed
below. If the magnet assembly of an existing CRT has been
removed or disturbed during removal of the tube; the Ring Magnets
will require repositioning and the same procedure applies to this
operation as to the fitting of magnets to a new CRT:,
(i) Raise the front end of the Chassis Assembly on a suitable
support to a height of approximately four inches above the surface
of the bench. Rest the detached Left-hand Side-panel, with plug
,PL301 connected, against the Chassis Assembly.
(ii) Insert the tube into its socket and support the front of the
tube on the upper edge of the Left-hand Side-panel at a convenient
angle for viewing.
(iii) Switch on the power supply to the Transmitter-Receiver Unit
and allow two minutes for the Unit to stabilise
(iv) Turn the function switch to RX B and the SEARCH/ HOME
switch to the HOME position.
(v) To determine whether a replacement tube requires magnetic
correction adjust the GAIN control to a suitable level and rotate
the TRIG preset control on the Timebase Unit until the timebase
runs freely: RedUct the gain to obtain a trace free from "grass"
and inspect the trace. If any displacement of the trace from the
centre of the screen can be detected, visually under these
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conditions, magnetic correction is required. Apply this correction
as detailed in the following paragraphs.
(vi) Reset the TRIG control as detailed in Section 4 (b).
(vii) Connect the Signal Generator output to the port "aerial plug,
switch on the Signal Generator and Pulse Generator. Adjust the
Signal Generator frequency to 243 Mc/ s and the output level
(modulated by 7s pulses .at 10 kc/s p. r. f.) so that no "grass" is
visible on the trace.
(viii) Set the GAIN control to a convenient level and adjust the
TUNE RX control for maximum signal amplitude, readjusting the
GAIN control as required.
(ix) Coat the inner surface of the magnet Seating Ring with a
suitable silicone compound, such as Releasil 7, to facilitate
assembly and adjustment. Place the magnet assembly carefully
over the front end of the tube, approximately 3/8 in. from the
-
screen.
(x) Observing the display on the CRT screen, rotate the
Seating Ring to a position where a central vertical trace, with
undistorted horizontal pulses, is obtained.
(xi) If a satisfactory display cannot be obtained by rotation of
the Seating Ring, rotate one of the Ring Magnets relative to the
other. With some tubes, only one Ring Magnet may be required
to obtain the best result.
(xii) The tube should be rejected if the trace cannot be centred
by the amount of correction provided by the magnets.
(xiii) When the magnet assembly has been correctly positioned,
align and refit the CRT Assembly as detailed in (a) above and
Chapter 2, Section 5(d). Take care not to disturb the magnet
'assembly during refitting.
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DESCRIPTION
Appendix 1
RECOMMENDED SPARE PARTS
ULTRA TYPE A. M. TYPE & REF.
Transmitter-Receiver Unit .. R825
consisting of:-
Transmitter-Receiver . . .. BR1082 .. .. Type 8971 Ref. 10D/ 20749
Power Unit . ? ? ? ? .. .. BP105 .. Type 8094 Ref. 10R/18240
Visor .. ? ? ? ? ? ? .. .. BR1081- .. Type 300 Ref. 10AT/1557
The following sub-assemblies
of Transmitter-Receiver
Type BR1082:-
Chassis Assembly .. .. .. . . BR1082-1
Transmitter Unit .. .. BR1081-7
Timebase Unit .. ?
? ? ? .. .. BR1081-12
RF/IF Unit ..
BR1082-30
Cathode-ray Tube Assembly .. X854-1000
consisting of:-
CRT .. ? ? ? ? ? ? ? (G. E. C. Type)
CAHA401.. .. Type CV389
Ring Magnet(s) ? ? B418-17
Seating Ring ? ? ? ? ? ? Y626-1023
NOTE: Sub-assembly BR1082-10 (Search Unit), consisting of Oscillator Unit
BR1082-31 and Switch Unit BR1082-32, is also available as a spare part. It
is not recommended, however, that this item be renewed at second-line ser-
vicing level. Faults should be remedied by renewing the Chassis Assembly,
of which the Search Unit forms an integral part.
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POWER UNIT
REMOVED FROM
CASE
PORT AERIAL
PLUG
STARBOARD
AERIAL PLUG
PL401
CHASSIS
ASSEMBLY
TRANSMITTER
AERIAL PLUG
TIME BASE
UNIT
PL 301
NSULATING 1S5O2
LEFT-HAND SHEET
SIDE- PANEL
UNING CONTROL
FLEXIBLE SHAFT
TRANSMITTER
FRONT FIXING
LUG
H742 FIG.1 TRANSMITTER -RECEIVER PARTLY DISMANTLED (LEFT-HAND SIDE)
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PL201
V
PRESET CONTROL
PANEL
RF/IF UNIT
FIXING
SCREWS(3)
COAXIAL
SOCKET
COAXIAL ,
PLUG(PL 251) L256
RF/IF UNIT
INSULATING
SHEET
RIGHT-HAND
SIDE-PANEL
H741 FIG.2 TRANSMITTER-RECEIVER PARTLY DISMANTLED (RIGHT-HAND SIDE)
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?
INDICATOR ELECTRICAL
REF. 10 0/ 92
PLESSEY MK.IV
6-WAY
FREE PLUG
AUDIO CABLE
TRANSMITTER-
RECEIVER
UNIT
TYPE R815
OR R825
PULSE GENERATOR
(10 kc/s p.r.f., 7s WIDTH)
0
-et--PULSE MODULATION INPUT
0
SIGNAL GENERATOR
(200Mc/s TO 250 Mc/s)
PLESSEY MK. IV
6-WAY FREE SOCKET
r POWER CABLE
LEAD CONNECTIONS
LEAD CONNECTIONS
PIN REF.
COLOUR
CONNECT TO:
PIN REF.
COLOUR
CONNECT
TO:
A
RED
TEL +
A
RED
AC COMMON
B
BLUE
TEL -
*B
s BLUE
80.V AC
C
GREEN
MIC-.*C
BLACK
115V AC
D
YELLOW
MIC + ,
D
BLANK
**E
WHITE
PRESS TO TALK+
E
GREEN
24V DC-'AT
F
BLACK
PRESS TO TALK-
F
YELLOW
24V DC +
0-5A
**IF PRESS TO TALK TYPE MICROPHONE
IS USED, LEAVE FUNCTION SWITCH
OF TRANSMITTER-RECEIVER AT
?RX R/T. OTHERWISE, OPERATE
FUNCTION SWITCH BETWEEN TX R/T
& RX R/T AS REQUIRED.
*EITHER 80V OR 115V AC,
400 c/s OR 800 TO 2,400 c/s,
75 VA, CAN BE USED.
NOTE :- SPEECH OUTPUT IS DESIGNED TO OPERATE TELEPHONES
OF 100 TO 200_n_ IMPEDANCE.
MICROPHONE INPUT IS DESIGNED FOR DYNAMIC MICROPHONES
OF APPROXIMATELY 20on_ IMPEDANCE. ?
L770
FIG.3. TEST RIG CONNECTIONS FOR SECOND ?LINE SERVICING
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?
? AUDIO CABLE
CONNECTOR REF
CP 1240-Y
TO TRANSMITTER -RECEIVER UNIT
PLESSEY MK IV 6-WAY
SOCKET TYPE Z560261
(PIN CONNECTIONS AS
FOR AUDIO SOCKET ON
FIG.3)
FREE SOCKET
Z56052I
FREE PLUG
Z560301
JUNCTION BOX
TYPE TJ2Il
TELEPHONE JACK
TYPE JK44
(JAN JJ-034)
POWER CABLE
CONNECTOR REF
CR I225-Y
PLESSEY MK IV 6-WAY
PLUG TYPE 256058I
(PIN CONNECTIONS AS
FOR POWER SOCKET ON
FIG .3)
4 WAY SOCKET
AMERICAN-TYPE
AN-3102A-14S-2P
MICROPHONE JACK
TYPE J K34
(JAN JJ -033 )
LEAD CONNECTIONS?POWER CABLE
? PIN REF.
A
CONNECT TO:
115V 400 c/s
22 TO 28V DC+
115V 400 c/s
22 TO 28V DC-
TO MAINS FUSES
AND SWITCHES.
L 775
FIG.3A CONNECTIONS FOR JUNCTION BOX 'TYPE TJ 211
(APPLICABLE TO TRANSMITTER? RECEIVER UNIT
TYPE R825 IN AMERICAN?TYPE INSTALLATIONS)
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TO EARTH ON
OSCILLOSCOPE
-4(
IM 100K 100K
CONNECTION MADE
TO INNER CONDUCTOR
ONLY. PLUG REF.
ZA 540151 OR
ZA 540152
TO OSCILLOSCOPE
Y AMPLIFIER
FLYING LEAD TO
R/F UN IT
REAR VI EW OF T/R UNIT
_ FIG. 4 TEST CIRCUIT FOR AERIAL SWITCH
CONNECTIONS MADE TO
INNER CONDUCTOR ONLY
ST BD. PORT ?
SOCKETS-TYPE
SR IC
BATTERY* OF
LOW' VOLTAGE ( NOT
TO BE GREATER
?, . ,
THAN 6V )
FIG. 5.
11
MEASURE V153 ANODE
VOLTAGE HERE
0 0 0
0.0.
0 0
L. 779
J
L720
TEST POINT - OSCILLATOR TUNING CIRCUIT
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? ?
INITIATING -
PULSE__
3rd PULSE ? ?
In. APPROX.
_
in. APPROX.
2nd PULSE - ? ? ? AP
i
1st PULSE ? ?
L 776
t 7
w an. APPROX.
_
TRACE CENTRED
TRACE RAISED
TO'
L.H. END OrAZ.BAND
TRACE LOWERED
TO"D"
R.H. END OF
"D" BAND
G : 6. CRT .DISPLAY? TIM EBASE CORRECTLY ADJUSTED
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PULSE ON
[80V1
V301 ANODE
PULSE ON
0.V. - ?
C/O ? ? ? ? ?
TRIGGER 1
LEVEL
80V
1
1.:?.1:HALV I NG PERIOD
? SOO AiS
i
te----330 kis 1
SCAN I
-AMP -- ?
LEVEL -1? ? -
(RV 304)
1 SLOPE VARIED
BY 41V303
180V
V302: ANODE' ' ?:
GRID
. 80AI
SOV
PULSE INPUT AMPLITUDE --r? v PEAK
FIG.7. TIMEBAE UNIT WAVEFORMS BEACON
V303
ANODE
V303
? ANODE -
V305
SUPPRESSION
WAVEFORM "
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411/ ?
6 KO (ZERO MODULATION)
MEAN
LEVEL
1190V
PULSE AT V302
ANODE
V303. GRID
V303 ANODE
12 -Ike (mAximum MODULATION)
FIG. 8. TIMEBASE UNIT WAVEFORMS-SPEECH
MEAN
LEVEL
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?
Issued by Technical Publications Department
Messrs. ULTRA ELECTRIC LIMITED, LONDON, W.3
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?
PUBLICATION No
?
PM 1011
DATE SEPTEMBER 1956
COPY No
SECRET
SARAH
SEARCH EQUIPMENT
PROVISIONAL
OPERATING INSTRUCTIONS
(TRANSMITTER-RECEIVER TYPE BR1082)
ULTRA ELECTRIC LIMITED
LONDON, W.3 ENGLAND
This document Is part of an integrated
111c. If separated from the file it must ho
Subjected to individual systematie nylon.
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SARAH TRANSMITTER-RECEIVER TYPE BR1082
PROVISIONAL OPERATING INSTRUCTIONS
Contents
Page
1.
Preparation for Use .. ? ? ? ? ? ? ? ? ? ?
3
2.
Long-range Search . ? ? ? ? ?
4
3.
Confirmatory Action . . . ? ? ? ? ? ? ? ? ?
4
4.
Initial Homing Phase ? ? ? ? ? ? ? ? ? ? ?
.
5
5.
Second Homing Phase ? ? ? ? ? ?
6
6.
Final Approach and Speech Communication _ ? ?
7
7.
Stand-by Operation . . . . ? ?? ? ? ? ? ? ? ? ? . ? ?
8
Appendix 1 - Marine Installations ? ? ? ? ? ? ? ? A. 1
Illustrations
Fig.
Transmitter-Receiver Unit and Visor
?
?
?
?
?
?
1
Front Panel Controls . . . . ? ? ? ? ?
?
?
?
2
Guide to Operation ? ? ? ? ? ? ? ? ?
?
?
?
?
?
?
?
?
?
3
Radiation Data .. . . ? ? ?
?
?
?
?
?
?
?
?
?
4
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INTERCONNECTINO
CABLES TO -
JUNCTION BOX
POWER UNIT JUNCTION BOX
OPTIONAL ACCESSORY)
FIG I
TRANSMITTER-RECEIVER UNIT AND VISOR
(1')(HiI \ S
1)
TxB
m
O F
E S
T
A
W C
0 R
S E
L A
\
H
\ TUNE TX
XTAL-------r
CHECK MELQ,111
....'
YT T
U U
N N
E E
Tx Rx
CODING
Tx Fix
R/T
TRANSMITTER
RECEIVER
FIG.2 FRONT PANEL CONTROLS
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CONDITION'
TYPICAL
ALTITUDE
RECEIVER
PICTURE
REMARKS
Search phase before reception
of Beacon signal.
Aircraft
10,000 feet
Helicopter
3,000 feet
Surface vessel
aerial height
25 ft.
Arib.
Centre switch on SEARCH.
GAIN set for appearance of green trace,
and increase until "grass" just reaches
inner graticule lines.
Left-hand (function) switch to RX.B.
i?
MN
i?&
-MN
I?I
IF
Imoupr
? Search phase on reception
of Beacon signal.
Beacon on port side.
Aircraft
10,000 feet
Helicopter
3,000 feet
Surface vessel
aerial height
25 ft.
i/91\
k
Cen'tre switch to SLOW
TUNE TUNE RX control tuned
manually for maximum signal.
Centre switch to FAST.
1!?
MILIIMIW
W
luitiappi
II?W
? ??
Beginning of homing phase.
Aircraft
5,000 feet
Helicopter
1,500 feet
Surface vessel
aerial height
25 ft.
agfill
I
bi
II?a
L
.
SHIFT adjusted to bring beacon pulse
between horizontal graticule lines. Turn
towards larger signal to equalize.
MENEM
1
II
.
Imin
mpir
Transmitter tuning.
I
..ii.
N?It
During early homing set function switch
to TUNE TX. Tune transmitter to
receiver for maximum signal, adjusting
GAIN as necessary.
Return function switch to RX."
ICHMV
'MI
IP'
Late homing phase.
800 feet
Alith.
GAIN control adjusted during homing to
keep signal between outer graticule lines.
Centre switch to HOME for accurate
homing display.
I?II?II
MMIn-A-MIE
1
II
V
'MI
OP'
Aircraft goes through null
and obtains fix.
500 feet
441Elb
Beacon signal increases rapidly and suddenly
vanishes as aircraft passes overhead.
I
C
II
MIME
1
I
V
'IMP'
Beacon signal reappears after null.
500 feet
AdIll
\
L
Aircraft orbits to port around
survivor ready for speech reception. Thus,
Beacon signal on port side.
I?II
1
EllEMMEI
111
II
V
144111,"
Speech from Beacon
(received on port aerial).
500 feet
AAR
\
L
P.R.F. of Beacon modulated by voice.
Function switch at RX.B To listen,
turn switch to RX.R/T.
Arra"
a
MMI1Ml.
IIEN?V
'WV
Beacon on LISTEN.
(Signal received on port aerial).
500 feet
404111.
Function switch at RX.B.
Searcher clearly knows that
he can talk and be heard. Turn left .
hand switch to TX.R/T.
(or press P. to T. switch) and talk.
I
1?I
OM
MIN
1
1
II
'MOW
NOTE: If the craft cannot rescue survivors the receiver may be switched
longer-ranged signal. Aircraft should climb to a higher altitude
to TX.B. Other rescue craft can then home on the
to increase range of transmission.
Three Beacons: 1 on port,
2 on starboard.
C
B
A
Aillillbk
Pulse spating characterizes
3 different Beacons.
..
I
IMMERMEI
!P_IL
Imre
`q11
-1-Pr
V
Three Beacons: 2 on port.
Aircraft homing on Beacon 'A.'
C
B
A
AM-UW,
Homing may be done on one
Beacon at a time ? approx. range
indication (relative amplitude of pulse)
shows which one to " fix " first.
ANNIIII
MIZE-MIN
1
N
I
NNW
FIG. 3.?GUIDE TO OPERATION?TRANSMITTER-RECEIVER TYPE BR1082
1_750
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180
160
140
120
100
80
60
BEACON RADIATION PATTERN
1.0 1.25 1 5 1.75 2 0 2.25 2
TIME IN SECONDS
207
184
161
138
115
92
69
.5
SPEED OF SEARCH AIRCRAFT PLOTTED AGAINST TIME
FOR PASSAGE OF NULL ZONE OVER BEACON AT 500ft.
Speed in knots at L.H. side; in M.RH. at R.N. side.
Inset, shows Beacon Radiation Pattern
TI. ISO.
FIG.4: RADIATION DATA
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? ? ? 3
OPERATIONAL PROCEDURE DURING AN AIRBORNE SEARCH
Fig. 3 (Guide to Operation) shows the sequence of events during an airborne
search and Fig. 4 the characteristics of the beacon radiation around the null point.
The search operator should be well exercised on these diagrams before undertaking
a search.
1. PREPARATION FOR USE
(a) Place the main distribution switch at SARAH and switch on the
relevant power supplies.
(b) Allow approximately two minutes for the Transmitter-Receiver to
stabilise.
(c) Turn the left-hand (function) switch (Fig. 2) to the RX B position.
(d) Turn the GAIN control clockwise until a green trace appears on the
CRT screen. Adjust the SHIFT control to bring the whole of the
trace on to the screen.
(e) Adjust the FOCUS control to obtain a bright and sharp trace.
(f) Adjust the GAIN control so that "grass" just appears on the trace,
but do not allow the grass to swamp the screen.
(g) Turn the SEARCH/HOME switch to SLOW. The port and starboard
aerials are now being selected at a rate of six cycles per minute,
i.e. , each is connected in turn to the receiver for 5 seconds,
followed by a rapid changeover to the other.
(h)
Turn the function switch to the XTAL CHECK position. A series
of crystal-controlled pulses should now appear on each side of
the trace, indicating that the Transmitter-Receiver is functioning
on the correct frequency. Adjust TUNE RX control for maximum
and reduce GAIN control as necessary.
(j) Turn the function switch to the SEARCH position and ensure that?
the automatic frequency, sweep is operating. This is visible as a
regularly-recurring change in the pulse amplitude, as
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displayed on the screen, twelve times per minute. The frequency sweep
ensures that a beacon is not missed because of some small discrepancy in
its nominal frequency.
(k) Return the function switch to the RX B position. The. Transmitter- s
Receiver is now correctly adjusted.
(m) Carry out the Long-range :Search procedure detailed below.
2. LONG-RANGE SEARCH
A search should initially be made at the highest possible altitude', to ensure
maximum range of reception. At an altitude of 10, 0000 ft, for example, the
beacon signal can be detected at a range of more than 70 statute miles, over sea.
The aerials have been positioned specifically to provide maximum search
coverage on each beam, with an adequate forward-looking range for homing
purposes. Thus, standard search patterns such as "Creeping Line Ahead" can be
followed with advantage.
Throughout the search, carefully observe the trace on the CRT screen as
the port and starboard aerials are alternately selected. A beacon signal, when
first detected, will appear only momentarily as the receiver tunes through it and
confirmatory action should immediately be taken as described in the following
section.
3. CONFIRMATORY ACTION
Assuming that a "Creeping Line Ahead" Search is being carried out, and
that the beacon signal appears on the port side, the aircraft should maintain its
present heading. When the signal reappears (after 10 seconds) its amplitude will
be greater as the point of maximum search aerial sensitivity is approached.
This may give a sufficiently positive identification of the signal to enable Homing
to proceed (see Section 4).
If there is difficulty in identifying the signal, the aircraft should turn
through 1800 (in this case, to port) and arrive on a course about five miles -
inwards towards the suspected position of the beacon. Watch for the momentary
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?
reappearance of the signal (in this case, on the starboard side). Should there be
no positive identification of a beacon signal, resume the original course and
continue the search.
When a beacon signal has been identified, turn the SEARCH! HOME switch
to the SLOW position and adjust the TUNE RX control for maximum signal
amplitude.
NOTE': If the beacon signal appears on both port and starboard sides, the
aircraft should be directed towards the larger signal until the signal pulses are
equal on both sides of the CRT trace. The procedure given in Section 4,
paragraphs (a), (b), (c), (g), (h), and (j) below can then be followed.
4. INITIAL HOMING PHASE
The operating procedure during this part of the search is given below:-
(a) Turn the SEARCH! HOME switch to FAST. The port and starboard
aerials are now being selected at a rate of 30 cycles per minute., i. e.,
each is connected in turn to the receiver for one second, followed by a
rapid changeover to the other.
(b) Check that the receiver is tuned exactly to the beacon signal.
(c) If more than one beacon signal is observed, rotate the SHIFT control
to centre the selected signal between the horizontal graticule lines.
(d) At this stage the signal may appear only on the port or starboard side of
the vertical trace. The aircraft should therefore turn through 90? - to
port if the signal is on the port side or to starboard if the signal is on
the starboard side - while the trace is carefully watched.
(e) During this manoeuvre, the signal will gradually fall on the side at which
it was first seen and begin to rise on the other side as the aircraft turns
towards the direction of the beacon. When the signals appear equal on
both sides, the aircraft heading should be steadied and this course
maintained.
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(f) Alternatively, at extreme range, the signal may disappear as the aircraft
approaches the 900 bearing. If the signal is lost, the aircraft should fly a
weaving course 450 to either side of the new line of flight as a confirmatory
check on the presence of the signal.
(g) When a useful signal amplitude has been obtained on the CRT screen, direct
the aircraft on to the correct course as indicated by the relative signal
amplitudes alternately displayed to port and starboard of the trace..
(h) If the amplitude is greater on one side than the other, the aircraft should
fly in the direction of the larger signal, in steps of 10? from the original
line of flight, until the displayed pulses are equal on both sides.
Carry out the close-range homing operation detailed in the following section.
5. SECOND HOMING PHASE
(a) Turn the SEARCH/ HOME switch to HOME. The port and starboard aerials
are now being selected at a rate of 600 cycles per minute and, because of
the long persistence of the CRT screen, the signal will now appear on both
sides of the trace simultaneously.
(b) Throughout the homing phase, an equal signal amplitude should be maintained
on each side of the trace.
(c) Adjust the GAIN control as required, so that the signal amplitude just reaches
the outer vertical lines of the graticule.
(d) During the horning phase, the aircraft should gradually reduce altitude to the
final approach height of approximately 500 ft.
CAUTION: If the aircraft reduces altitude too quickly, the beacon signal
may be lost.
(e) When a signal of sufficient amplitude has been obtained, tune the transmitter
as follows:-
(1) Check that the receiver is correctly tuned, as described in
section 3 above.
(2) Turn the function switch to the TX B/ TUNE TX position.
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(3) Adjust the TUNE TX control so that the amplitude of the
displayed signal is a maximum, reducing the gain as
necessary.
(4) Return the function switch to the RX B position.
(f) The transmitter is now tuned to the beacon ready for speech transmission.
6. FINAL APPROACH AND SPEECH COMMUNICATION
(a) Continue the homing procedure, always maintaining a display of equal
amplitude on each side of the trace and readjusting the GAIN control
as required.
(b) As the final approach is made to the beacon, the signal display Will
rapidly increase to a maximum amplitude and then as rapidly decrease
to zero (see Fig. 4 for Beacon Radiation Pattern).
The beacon is now immediately below the aircraft.
At this point the aircraft's position should be fixed, using Gee, visual
means or any available navigational aid, and transmitted to the
appropriate rescue authority.
(c) The signal will reappear as the aircraft continues on course.
When this occurs, the aircraft should turn to port and orbit around the
position where the zero signal was obtained.
NOTE: In the RX R/ T position of the function switch, aerial switching
ceases and the port aerial is continuously connected to the receiver for
speech reception. A port orbit places this aerial nearer to the beacon.
(d) At this stage, the survivor may decide to use the Speech Unit of his
beacon to make R/ T contact with the aircraft. When speech trans-
mission begins, the single pulse displayed during normal beacon trans-
mission will change to two or three pulses, which will "jitter" about
their relative positions on the trace in accordance with the speech
modulation.
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) Immediately these characteristic signals are seen, turn the SARAH! NORMAL
INTER-COM. switch in the aircraft to SARAH and the Transmitter-Receiver
function switch to RX R/ T, to receive the survivor's message.
NOTE: If Junction Box Type TJ211 is fitted, insert the microphone and
telephone plugs into the jacks on the front of the Junction Box then turn the
function switch to RX R/ T.
(1) To reply when the survivor's message ends, turn the function switch to TX
R/ T and speak into the headset microphone.
Alternatively, if the press-to-talk facility is incorporated in the SARAH
installation, leave the function switch at RX R/ T and operate the press-to-
talk switch on the microphone before replying.
NOTE: When the survivor has pressed his LISTEN button for speech
reception, the CRT display will consist of several small signal pulses
equally spaced down the trace. This can be verified by turning the function
switch to the RX B position and observing the display.
7. STANDBY OPERATION
The search aircraft may not be equipped to rescue a survivor. In this event,
the aircraft may stand by until a suitably-fitted aircraft or surface vessel arrives.
? To assist in directing a rescue craft to the survivor, turn the function switch
to TX B/ TUNE TX The Transmitter Receiver is now transmitting a pulse signal
of similar type to that emitted by the beacon, with the advantage of greater range
conferred by the height of the aircraft. A rescue craft, even if based a considerable
distance from the survivor's position, will thus be able to use its SARAH equipment
to,pinpoint this position.
For example, a launch can receive signals over a range exceeding 40 miles
from an aircraft circling at 5, 000 ft., and will home on these signals until it
approaches within 6 to 7 miles of the survivor. At this point the launch will begin
to pick up signals from the survivor's own beacon transmitter and will thenceforward
home directly on to him.
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IMPORTANT NOTE: When the survivor has been rescued, switch off his
beacon at the earliest opportunity to prevent further radiation of the pulse
signal.
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APPENDIX 1
MARINE INSTALLATIONS
A. 1.
The foregoing operational procedure also applies, in general, to the
Transmitter-Receiver Unit as fitted to marine craft, provided that the references
to altitude and overhead null are disregarded.
During homing, the amplitude of the beacon signal displayed on the CRT
screen should be maintained equal on both sides of the vertical trace. The ship
is thus directed towards the beacon until the survivor is actually seen (refer to
Fig. 3, "Guide to Operation").
Where the DF Homing Aerial is fitted, and in conditions requiring its use
(e. g., fog, darkness or rough sea), the survivor's position is found by rotating
the Aerial to the null signal position (in which the plane of the Aerial is at right-
angles to the survivor's bearing) and reading off the bearing on the Indicator Unit
at the operator's position.
NOTE: Full information on Marine Installations will be included in
another publication at a later date.
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,a9101:M".4-4- ?
? .0.4.
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?
Issued by Technical Publications Department
Messrs, ULTRA ELECTRIC LIMITED, LONDON, W.3
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