SOVIET TECHNICAL DOCUMENTS ON THE KV-0.25 SHORT-WAVE RADIO, THE 10-RT RADIO, AND THE BRUM ARMORED RECONNAISSANCE AND PATROL VEHICLE

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80T00246A064500200001-3
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 119
• Document Creation Date: December 22, 2016
• Document Release Date: December 6, 2011
• Sequence Number: 1
• Publication Date: September 25, 1962
• Content Type: REPORT

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I 'W K IV
~'~ RI~t'1~ 7-T~' ~Fa
Chapter IV
MAItTENANCE AND OPERATING INSTRUCTIONS OF THE KB-O. 25
TRANSMITTING RADIO STATION
P E R A T I N G T H E R A D I O S T A T I O N
1. Preparation for Turning
rhe:.-station is 'prepared following the procedure below:
(l) 2..5- 3 hours prior to operation, swito1 on the
heating of the oscillator. thermostat operating the thermostat
heating toggle switch located on the front panel of
transmitter unit No.1; this time is siffioient for all the
circuit components of the first stage, which determine the
frequency of the transmitter, to attain the temperature at
which the oscillator was calibrated at the factory, If the
thermostat heater operates normally, the signal lamp on the
front panel of unit No.1 should go on and out periodically.
At the same time the characteristic noise of the thorraostat
fan motor should be heard. If for some reason the thermostat
cannot be switched on, then the frequency settin., accuz iqy
of the- operating station will be below that guaranteed by the
factory.
P It
PfIrT
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When operating on crystal-controlled frequencies,
thermostatheater of unit No.5 and the preliminary
crystal:heating 'elementshould bo.switched on from 2 to
:3".'`h'ours before- operation, with the devices B inserted
beforehand into the thermostats, If the ambient temperature
not lower.-than ?20o,, a' preliminary heating period of 1
is sufficient. Witii the thermostat heating
sritohed off, the frequency accuracy of devices B is
(3').\hon the station is supplied by a D.C. mains, the
next stage In. ' the 'preparation of the radio station for
operation should be the starting of the converter.
For. this proceed as follows:
(a) 'set the knob for emergency starting of the motor
at the starting station to the position STOP (CTOf);
(b) set the knob of the manual excitation control PD
or P35 to the extreme position to onsure all--in
resistance LESS (HMiE);
(o' set the mains switch of the rectifier assembly to
the middle position OFF (B itl~ `~~L-.;O) .
(d') on the supply switoliboard, set the ship's m,^ ins
switch to one of the positions STARBO:?,RO (fll !E
EOPT) or PORT (Jt B)H,",, ;;0} T) if volta ,e i;; pre sc nt ,
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,switchboard and keep it pressed for 1 - 2 seconds.
er, should: read the voltage of the D. C.
the push-button START (HYCH on the supply
hand until the cause of'the fault is discovered.
obtained, then the converter can be started by
na''I;;'-lamps should light up and the
If.for some reason automatic starting fails to be
do. this,switoh the emergency starting knob
from the position STOP. to the position START
pausing at each oontaot*for 2 - 3 seconds,
With the converter started,-the A.C. generator should
become excited, When the voltage stabilizers BPTIT-2.5
and _PYH :are' used,,. the generator voltage should be automatioal-
ly -adjusted to.read almost the nominal value, i.e. 220 volts.
In case of the AIIHT-85 generators which are not provided
with full. automatic stabilization, the voltage is set with
the manual regulator P3B,according to the voltmeter located
in the rectifier assembly.
When employing the generator of converter rT-2,5 the
generator voltage is regulated as follows in oaso . the
automatic voltage regulators PYI{ fail to operate. The
rotary switch of the regulator PB is turned to the position
at which the resistance of the carbon pile is shunted.
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After the switch is operated, the knob of the PB regulator
is turned to set the required generator voltage, using the
voltmeter located on the rectifier assembly.
Regardless of the value of the external loads when the
current stabilizer is operating, no further adjustment of
the generator voltage will be necessary.
The speed'of the converter motor should not be adjusted
uring.service.
During,. operation of the converter it is necessary to
monitor the value of the current consumed from the mains
by means.of the mmeter.mounted on the supply switchboard
(the ammeter installed in unit No;l of the rectifier assembly,
S
monitors the current supplied by the generator').
(4) Turn the supply knife switch of the rectifier'
to the position PORT or STARBOARD, depending on where the
A.C. voltage of the converter or the A.C. ship's mains is
fed to. If:thero is voltage in the 'mains, the neon signal
lamps located under the knife switch will light up.
(3) Check the value of the mains voltage with the
voltmeter in rectifier unit No.l (198 - 242 volts are normal
for a 220 -V -.mains and 342 - 418 for a 380 V mains), Use
the same voltmeter to check the +24 V auxiliary circuit
(24 to 30 volts are normal'); should the voltage be loss
check the fuses flP-5 and I1P-4 in the first rectifier unit.
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;Note: The ship's mains knife switch of the rectifier
may be switched off only during prolonged
interruptions in the transmitter operation. This
is due to the fact that with the knife switch
off,the +24 V circuit supplying the automatic
system is broken thus making impossible remote
switching on of the station from the control unit,
the remote communication post or the radio opera-
tor's post,
(6) Set the switch of the series-connected capacitors
of the? antenna circuit. SWITCH OF ANTENNA CIRCUIT,SERIES
(IIEPEHJI.AHT.HOHT.rIOCJI. ) of transmitter unit No.3 to posi-
tion 5 (earth). The antenna is now earthed thereby preclud-
tng inadvertent transmission provided the station has been
first prepared for operation.
(7) From 5 to 10 minutes prior to tra n. mis: ion, s%-,,itch
on the heaters of the transmitter valves with the aid of
the push-button START (HyCK) of the control unit, the
green lamp of the control unit;. should now light up. Pro-
liminary switching on of the heater supply is necessary in
order to increase the frequency setting -accuracy.
(8) Set the high voltage toggle switch of unit 1 of
the rectifier to the position TUNING ( HACTPO FA the
signal lamp of unit No.3 of the rectifier should light up,
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With, the aid of the toggle switch RADIO-INTERCOM.
control unit,switoh on high voltage by setting the
toggle switch in the upper position RADIO. The emergency
sw., toh'''of ..the second. rectifier unit should be in the position
ON.(BKJI. .:The emergency switch should be used only in case
of emergency or when it`is neoossary to preclude switching
,left n the OFF position unintentionally, may cause an
interruption in communication.
If high voltage is switched on immediately after switching
on the'heator voltago,.it will be automatically delayed for
20 to 40 seconds, This is the time of operation of the valve
.time relay,
(10) Liake 'sure that the rectifier functions normally and
then switch off high voltage by setting the toggle switch
RADIO - INTER0M. to the position INTERCOM. The red lamp of
the control unit will go out. This operation completes
the procedure for preparing- the transmitter for tuning.
(11) To switch off the station, press the push-button
STOP on the control unit. The transmitter valve heaters will
now be switched off, and the green signal lamp of the control
unit will go out.
(12) The converter is stopped as follows:
(a) -in case of manual oontrol, remove the generator
voltage by setting the knobs of the regulators PB or P3B
to the position- LESS (H
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(b) by pressing the pushbutton STOP on the supply
switchboard (when the 'automatic system operates) stop the
electric motor; if the electric motor was started.: with
the manual emergenoy nwitoht then the knob of this switoh
should be turned rapidly from the position'START to the
position STOP and the push-button STOP on the supply
switchboard pressed again;
(o) ,turn the ship's mains switch on the supply switch-
board to the middle position; the signal lamp will go out.
After -stoppingthe motor, the ship's mains switch should
not be. left `1n ':the ON position.
Tuning, the Transmitter in the Continuous Range
Without Tables
Preparation of Tuning Tables
The dooume'nts'supplied with the station include a calibra-
tion book. This.bo.ok Is not filled in completely at the
,factory, as the transmitter is checked at the factory not
with an antenna but with a dummy antenna formed by a
wire-wound resistor of 70 ohms.
The tuning of the antenna circuit, the value of the
coupling to the antenna, and the tuning of the output stage
depends on the type and characteristics of the antenna in
conjunction with which the transmitter will be instahled.
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This accounts for the fact that the corresponding columns
of the tuning tables of the book are not filled in at the
factory. These entries should be made after the power
unit, the oscillator and the intermediate stages of the
transmitter have been chocked.
Tuning tables should be compiled beginning with the
frequency 1.5 Mc/s of the first band. To do this proceed
as follows:
(a) start the converter and make sure that there is
mains voltage;
(b) switch on the power knife switch of the rectifier;
(o)' switch on the valve heaters with the aid of the
push-button of the control unit;
(d) operate the band selector switch to set the first
band ;
(e) set the antenna coupling knob to position 1;
(f) set the given frequency (1.5 Mc/c,) accordin; to the
optical tuning dial;
(g) set the function switch of unit No.5 to the position
CONTINUOUS RANGE (HJVBWi AMAIIA30H).
(h) 'sot the H.V. toggle switch to the position TUNING
(HACT'P01JiKA ); set the function switch of the control
? unit to the position CW (H3T )~ switch'on high voltage
and prosy the key;
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tn~ngknob' of the third and fourth
e' 6ircuits to maximum current in the
:,control grid circuit of the fourth stage; the
Iread-ings of the third and fourth stage dials should
oorr%spond to those indicated in oalibration
book (small divergence within-1 - 2 divisions is
permissible);
(.1') operate the tuning knob of the fourth stage to tune
the intermediate circuit to minimum anode current
of the fourth stage valve;
(k) increase antenna coupling by several positions and
tune the antenna circuit to maximum reading of the
antenna indicator or maximum reading of the anode
milliammotor of the fourth stage valve. If the antenna
circuit fails to be tuned at once, :yet the knobs
controlling the series -? and parallel-ooonected
capacitors of the antenna to the variou's positions;
(1) having tuned the antenna circuit, adjust the antenna
coupling in such a gray that the anode current of the
fourth Otago attains approximately 0.2 ampere and a
slight dotuning of the antenna circuit to the right
and left of the resonance position causes the anode
current of 'the fourth stage to decrease;
(o') switch off high voltage with the to'g,5le : switch of
the control unit. Sot the high voltage toggle switch of
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the rectifier to the position OPERATION ( PABOTA)
Switch high voltage an again;
(n) press the key, ohock how accurately the antenna
and intermediate circuits are tuned.
(o) by adjusting the coupling, bring the anode cur.cent
of the fourth stage valves to. the normal value of
about 0.4 ampere (the pointer of the voter should
not go beyond the limits of the coloured sector).
The grid current of the fourth stage valves should be
0
within 12 - 30 mA. The operating conditions of the First,
second and third stages should correspond to the table of
operating conditions compiled by the factory. Deviations
within 20 - 25 per cent are permissible.
The heating of the 11-A-71 valve anodes should not
exceed the permissible value (dark anodes).
If the above conditions are fulfilled, the positions
of the tuning knobs and dial divisions are entered in the
tables of the calibration book, and the next higher. frequency
can be tuned to. In this way all the tables of the calibration
book are filled in.
Tuning the Antenna Circuit when Operating with
Various Typos Antennas
As was alroady mentioned, the positions of the antenna
circuit knobs when tuning to a given frequency have to be
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or at minimum value;
(c) tuning to resonance is sharpest;
(d) the continuous tuning knob of the antenna circuit
is not at the. end or beginning of the dial} i.e. It
is possible to tune to left and right of resonance;
(e) the anode current load of the flj-71 valve, is
greatest, while anode heating is the least (the
anodes are dark).
With series feed of the antenna (series connection of
the condensers) the readings of.tho antenna indicator are
proportional to the current in the antenna proper and in this
case it is necessary to tune to maximum reading of the
indicator.. With parallel antenna feed (parallel connection
of the condenser;) the reading of the antenna indicator
is proportional to the current in the antenna circuit. The
looser the ccupling of the antenna to the antenna circuit
the greater the current and the more power lost in the
antenna circuit proper and less fod into the antenna. For
this reason, whon tuning the antenna circuit to ;iaximum
or of maximum value;
(b) the parallel-connected capacity is disoonnectod.
oaltlons may be found at which the antenna
tunes. That combination should be chosen with which:
:`the. series-oonnected capacity is short-circuited'
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e-; antenna ndioator with parallel antenna
reduce the: value of this maxi
b
d
y
mum rea
ing
:the oapaoitanoe oonneoted in parallel with the
hon tuning the antenna circuit, the following order
observed;
tune with decreased-anode voltage of the fourth
stage (position TUNING);
(o) without changing the tuning of the fourth stage
increase the antenna coupling by turning the knob
tune the fourth stage with antenna coupling at
the minimum value;
(d) it is recommended to be-in tuning the antenna
circuit from the position whon one inductance iz
connected.in the antenna circuit (the left-hand ;,:itch
of the antenna circuit is in position 4, the rig;ht-
hand switch a in position 1). Switch on corio3
capacitors begining with the highest (positions 3,2,1)
then as the need arises connect the parallel
capaoitors beginning with the lowest (position 2,
snd than 3, 4, otc.)j
(e) having tuned the antenna circuit to the maximum
ANTENNA COUPLING (CB.ff3b C AHTEHHO,) one
positions to the'right;
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readings of the indicator (or to maximum glowing
of the neon lamp and to maximum reading of the
anode current meter of the fourth stage), increase
the antenna coupling still more till the load of
the fourth stage valves reaches a current of aboat
0.2 ampere (with reduced anode voltage). Coupling
should be increased gradually with simultaneous
tuning.of the antenna circuit. If the tuning is
correct, detuning of the antenna oirouit unloads the
output stage. Decreasing coupling unloads the output
stage, without greatly detuning it.
3. Tuning the Transmitter in the Continuous Range
according to Tables
After preparation of the station, the transmitter is
-tuned according to the tables of the calibration book in
the following way:
(a) Set the band selector switch to the required band;
W A R N I N G. Switch bands with the high voltage o-f`..
?(b) set the given frequency in the optical dial with
the knob TUNING I-Il STAGES (HACTPOIiKA 1-II K);
(o) set the function switch of transmitter unit No.5
in the position CONTINUOUS RANGE ( IIJIABIIiyi A fA11A3OH);
(d) set the high voltage switch of rectifier unit No.1
in the position TUNING (IIACTPC!AKA);
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according to the calibration table set the
following transmitter tuning knobs TUNING OF III-IV
STAGES (HACTPO fKA III-1-T RACK.) of unit No.2;
TUNING OF IV STAGE (HACTPOiKA Iv HACK. ) of unit
No.2; ANTENNA COUPLING ( CBfi3b C AHTEHHOIi)
of unit No.2; ANTENNA CIRCUIT INDUCTANCE (IT YKTIIB-
HOCTb AHTEHHOI'O KOHTYPA. ) of unit No.3;
ANTENNA CIRCUIT SWITCH (nEPERA.AHT.KOHT.)
SERIES (flOCJL) and PARALLEL ( ITAPAJIJI.) of unit No. )#
(f) make sure that the appropriate antenna is connected
to the transmitter via the transmitting-antennas
switchboard;
(g) switch on high voltage by setting the toggle Switch
of the control unit in the position RADIO ( PAA1IO);
(in) press the key or the push-button KEY (KJIM) of
unit No.5 and tune the antenna circuit (ANT NNA
CIRCUIT INDUCTANCE) to maximum reading of the antenna
indicator;
(1) switch off high voltage; setthe high voltage switch
of unit No.1 in the position OP Ri:TION ( PA.BOTA)
and switch high voltage on again. This concludes
preparation for operation.
4. Tuning the Transmitter with the Crystal- Gontrolled
Oscillator
With the crystal-controlled oscillator, the transmitter should
be tuned e.3 follows:
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(a) select the devico B according to the given frequency
and insert it in unit No.5;
(b') set the function switch of transmitter unit No.S
in the position CRYSTAL LAVES - AMPLITUDE KEYING
(KBAPU.BOJI IbI - AMIIJI. MAHIIIII.) f or amplitude keying or in
the position CRYSTAL WAVES - FREQUENCY-SHIFT
KEYING ( KBAPIj.BOJ1H - uACT.IYIAH.) f or printing
telegraphy;
(o) set*the band selector switch in accordance with tho
given frequency;
(ii' ae?t the toggle switch of the rectifier unit No.1
in the position TUNING ( HACTPO"riA);
(e) switch on high voltage from the control unit by
setting the toggle switch RADIO - INTERCOM. ( PI.jIiO-
BHYTP. flEPEI'OBOP1) in the position RADIO;
(f') with the tuning knob of transmitter unit No.1 tune
the second transmitter stage coarsely by settiag
the given frequency on the optioal dial;
The second stage is tuned finely according to minimal
anode current as measured by an external milliammeter connected
to the Jack ANODE OF II STAGE (AHOJL II It) of transmitter
unit Ifo.l1 Often tuning by the dial does not coincide with
tuning by the milliammeter. This is due to the faot that the
dial is calibrated by the frequency generated by the fir.-,t
stage, and absolutely exact tracking of the second and first
stages is not always obtained;
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(g1 switch off high voltage by setting the toggle snitch
RADIO - INTERCOM. in the position INTERCOM;
(h) set all the tuning knobs of the third and fourth
stages and the antenna circuit according to-the tables
of the calibration book;
(I) set the toggle switch of rectifier unit No.1 in the
position OPERATION;
(j') switch on high voltage by setting the toggle switch
of the control unit in the position RADIO;
(k) tune the antenna circuit to maximum reading of the
indicator.
0
5. Switching Modes of Operation
For CW telegraphy proceed as follows:
(a) tune the transmitter to the given frequency;
(b) sot the function switch of the control unit in
in the position C`,Y (H)T);
(o' depending on the communication conditions (distance,
time, season, otc'.) set the power regulator of the
control unit in the required position;
(d) switch on high voltage with the toggle switch
RADIO - INTERCOM.
The operation of the 'transmitter can be monitored with
the aid of the receiver headphones oonnoctod to the control
unit$ or with the handset of the control unit. Volume is
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;nodulator unit of the oontrol utiit.
d'ustad with the monitoring volume oontrol knob of the
Fortcne-modulated tole av it is necessary to tune
the transpitter in the come way as for C!'/ tolography and to
`se:"t the funotion switch of the control unit in the position
''TONE (TOH).
For telephone operation proceed as follows:
(a) set the function switch of the oontrol unit in the
position TELEPHONE ( TJI');
(b) sot the power regulator in the position 5 correspond-
ing to 100 per oont output (in telephone operation
power must not be decreased as this may cause
oonsidorable distortion due to overmc.dulation);
(o) switch on high voltage with the toggle switch
RADIO -INTERCOM by setting it in the position RADIO;
(d) lift the handset, press the handset press-to-talk
lever and transmit by miorophono, listen to the
answer of the other. station when the handset prosy-to--
talk lever is released.
The presence of modulation can be monitored by the modula-
tion meter of the oontrol"tlnit. In order to avoid distortion
caused by overmodulation, oare should be taken that the
depth of modulation during transmission does not oxcood
100 per oent, for which Purpose the knob DEPTH OF MODULATIOA
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(1'JI~SNHA MOAYJIHWII) of the control unit is sot in the
appropriate position.
For external modulation' it is necessary to connect the
source of external modulating voltage to the lines I and 0
of the transmitter.
The transmitter is tuned in the same way as for CW
operation.
$ot the function switch of the control unit in the post-
tion EXTERNAL MOD. (BH111.MOA. )
6. Operation From Remote Posts
?
When omployinZ the remote oommunioation posts proceed
as folldws:
(a) set the toggle switch RADIO - INTERSOM. of the ro-
mote communication post in the position INTERCO1.1 then
lift the handset and press the push-buttoaCALL (BU30B);
the call signal lamp of the switchboard should light
up;
(b) on hearing the response of the switchboard, request
the party to be oalled, and hand up the handset;
(o) on being told by the switchboard attendant that the
equipment is readyp press the pus}-button START (IIYCK).
After this goon lamp should light up signalling that
the heators of the transmitter valves are ewitohed on;
(d) set the togble.switch.RADIO - INT RCOM., in the posi-
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tion RADIO. From 30 to 40 seconds after the heaters
have been switched on} the red lamp will light ups
signalling that high voltage has been applied to
the transmitter valves;
(o) after high voltage has been applied to the transmit-
ter, begin transmitting. Telegraph communication is
conducted by means of the key. For telephone opera-
tion lift the handset, press the handset press-to
talk lover and speak into the microphone. For recap-.
tion release the handset press-to-talk lever and
listen to,the anovier of the party being called;
(f) under conditions of poor audibility, or if it is
desired to conduct loudspeaker reception, switch on
the amplifier by setting the toggle switch in the
position ON (BI{.I.). Volume is controlled with the
knob on the front panel of the amplifier;
(g) having completed communications, hang up the handset
(in telephone operation). Switch off high voltage
by setting the toggle switch in the position INTERCOM.
The rod signal lamp should now go out. Switch off
the amplifier. Press the pushy-button STOP ( CTOn
a;:tor which the green signal lamp should go out.
When operating from the radio operator's post:
(a) set the toggle switch of the radio operator's
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(e) telegraph communication is conducted by means of,the
has boon switched on;
signalling that the high voltage of the transmitter:.
tion RADIO, the red signal lamp should light up
(d) set the toggle sv,itch RADIO - INTERCOM, in the posi-
poot in the position INTk!COM.; set the monitoring
toggle switch in tha,'.0p0;sition ON (B .)
(b),lift the handset and press the CALL button. On
hearing the response of the switchboard or
transmitter, report that you are ready to transmit
and hang up the handset;
(o) if the radio operator'3 post is switched to the
transmitter which is ready for operation, then in
order to transmit, switch on the heaters of the
transmitter valves with tho push-button START, the
green signal lamp should light up;
key. For telephone operation lift the hand-set,
press the handset press-to-talk lever and speak into.
the microphone. Having spoken release the,handaet'
press-to-talk lever and wait for the'answer._;During
lengthy reception, sot the monitoring toggle snitch
in the position OFF (&-ItJI. );
(f) having oomploted operation, hang up the handset
(in telephone operation) and switch off the high
voltage of the transmitter by setting the toggle
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switch RADIO - INTERCOM. In the position INTERCOM;
the red signal"lamp should now go out;
(g) switch off the heaters of the-transmitter valves
with the push-button STOP (CTOII ), after which the
green-signal lamp should go out and the transmitter
be switched off.
When omploying remote posts (remote communication post
and radio operator's post) for internal communication:
(a) set the toggle switch in the position INTERCOM.
0 When 3porating from the radio operator's post it- i3
also necessary to set the monitoring switch in the
position ON (BKJI.);
(b) lift the handset and press the CALL push-button;
the call signal lamp of the switchboard should now
light up. The switchboard attendant should connect
and call the required subscriber, after which
internal communication can be oonduoted;
(c) if a call comes through to the radio operator's
post or the remote communication post (the CALL
lamp lights up or the call signal is heard in the
telephone or the dynamic loudspeaker of the remote
communication post amplifier, if it is snitched on),
then switch on the toggle switch INTERCOM, and at
the radio operator'3 post also set the monitoring
to-Ye switch in the position OtS, lift the handset
and ansvior the c:iil;
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(d) on completing communication hang up the handset;
at the radio operator's post switch off the monitor-
ing toggle switch.
7. Semi-Duplex Operation
Semi-Duplex Operation with Two Antennas
0
9
When two antennas (rooelvint; -:nd transmitten ') are
employed, the receiver at the oontrol unit of the radio
operator's post should be connected to the terminals P,$I,O,
according to the circuit of the receiver (depending on which
circuits of the receiver should be effected by the contacts
of the semi-duplex relay for outtin, off the receiver).
For reception on the transmitter frequency or near to
it, set the semi-duplex toggle switch of the control unit
and the radio operator's post in the position ON (i3KJi.)
Reception is conducted with the key released, because with
the key pressed, the receiver is out off. In telephone
oporation, reception is oondootod with the press-to-talk
lover released. With the pro.ss-to--talk lever pressed, the
receiver is out off and supply volta;;e is applied to the
microphone of the handset.
In reception and transmission on different frequencies,
3r during prolonged reception, the semi-dupl::x toggle switch
is act in the position OFF ( .1. Reoeption can be oon-
duoWed simultaneously with tranumis.,ion.
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Somi-.Duplex Operation with One Antenna
0
In this oase the transmitter and the receiver operate
into one antenna, switched by a special antenna relay, in.-
stalled at the transmitter. The antenna terminal of the
receiver is connected to the antenna relay by a radio-frequency
oable.
In ono-wa;l communication (transmission without reception)#
the semi-duplex toggle switch of the control unit is set in
the position OFF ( ;KJI.)- In this case the antenna is connected
to the transmitter as soon as mains voltage is applied.
In two-way telegraph communication, sot the semi-duplex
tog;;le switch of the control unit in the position ON ( BKJI.I
For reception, the togle switch RADIO - INTERCOM. of the
oontrol unit or the radio operator's post is set in the
position INTERCOM. In this case the antenna is connected to
the receiver. For transmission, set the togl.le switch in the
position RADIO, high voltage is applied to the transmitter and
the antenna is connected to the transmitter.
For two-way .telephone communication, set the semi-duplex
tO.ile switch of the control unit in the position ON. For
transmission press the press-to -'talk lever which connects the
antenna to the transmitter. On concluding transmission,
release the press-to-talk lever; the antenna will now be
connected to the receiver' nakin ; reception possible.
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8. Printing by Radio
Printing by radio is carried out with the aid of
telegraph sets,
To do this proceed as follows':
?
(a) connect the output of the telegraph set to the radio
station, as indicated below;'
(b) select the device E corresponding to the given
ciorkin