RESULTS OF HRT-2 BEACON TESTS CONDUCTED 7-8 SEPTEMBER 1961

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03153A000700030012-1
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 8
• Document Creation Date: December 23, 2016
• Document Release Date: May 12, 2014
• Sequence Number: 12
• Publication Date: September 10, 1961
• Content Type: MEMO

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CIA-RDP78-03153A000700030012-1
ROUTING SLIP
RAK
GIS
*AISew
?OW
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Release 2014/05/14:
CIA-RDP78-03153A000700030012-1
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1-1 ONLY Lurint.ri 1AL
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ROUTING AND RECORb SHEET
SUBJECT: (Optional)
FROM:
'
NO.
DATE
TO: (Officer designation, room number, and
building)
DATE
OFFICER'S
INITIALS
COMMENTS (Number each comment to show from whom
to whom. Draw a line across column after each comment.)
RECEIVED
FORWARDED
1.
--r7
/./444
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2. 1
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3.
4.
5.
6.
7.
8.
9.
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FORM
1 DEC 56
61 0 USEDTIEJIII7US ID SECRET 1:1 CONFIDENTIAL El luNsTEE ROA UNCLASSIFIED
G. S. GOVERNMENT PRINTING 08.8TEE 1958 0-476731
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SECRET
Ire MN MIR
3,0 Shiptember 103.
moor : ilesalto et 111ff..2 leases Tests Ceedhieted 7.6 Serberber 19d1.
1. Aelse et air te meth, hewing toots were seem-
Wahl* sei I$& Saw Woks loam 50X1
Eatosadas Vie operatices3. acosptalidlti, ot the OM 5UX1
tressaitter wit* both the kilet ase the Ads edema. $AT 406 vat
? i.0111343ie vete um& ae basin siren". The 0444 vas eluilelPet
vttkeme MINI rattle eargare. ft lit* a Lear 1014.11. both
toy eat opeNativail tests vivre asesigilieles? lbe weather ea 50X1
Agyis leas vatareeraIte ter higher atilitsie toots. ?NUM sae-
dioetivitr is Ike tete area VW millishoei NW at ra "Oa" IA
tho USW litotes. US* vow 50X1
saili 111,00. 50X1
2.ftnevatifinez test results aro stteshoi. Sew general
chearvatiea -Wiavl sift ihtriag teatiag that eboalA be acted, hoverer: 50X1
a. titilisiss 4 *tip esteems is the terseessitter redoes.
IllegliptiOn swop hew 1111 to 1/2. (M: Ti. au* swim et
eogsassit toots shoat be mob vilth the We est the At Wow*
the 'shim is siiidositoi tem easatisostioa tor opiestioosi U.S.)
b. Sigma r000ptioe vow in the Mello ittilising the Lear
Atst-lt receiver vas vierahle that et the C.47 littlAtiegag the 1IN-4.
e. Wag the leap pesitisa ienr.tbikJial.6 v231 lured*, 41*..
tames et siva reeeptlea sheet 1/3.
4. la the flat terrain at the testing site reeeptiea
marl loaf aillreedelately Vas seas in ill guaireerbs.
e. Right eiperatlea redeeeill raseptien abort ,00.
f. A ratio eaves. wane latisattea Is ?wafte* ea the
? Iveg Wore a *lima to *Wale. 2ho ofsellle listieotiett sat
sirs Own otioltasoons vith tile low siP44.
g. aispmsege laillootion on botik soceivors vas
elSolotiostaly IOW smoso.1 all woo* tho soon* vouNik loggia to
flustoote wow .tho Ototteo 1.1 to It oosesto 3atert (heptestiag
imps repeeivier) the alseAke vivid etabilive la the
leo? ? point**. ibe Leer 011?11 teak IA to 1 seeferA Ion 00111?
plate the eittvg la shit awe.
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10
tiSbORANDUM FOR TM RECOILS
SUM= : Results of mr.2 Beacon Tests Conducted 7.8 September 1961
1. Ger.1740 A series of air to ground homing tests were accom.
pliahed on . September 1961 These teats were to 50X1
determine the operational acceptability of the 110.2 50X1
transmitter using both the A-42 and the whip antenna* C- b7 #75 and
Helio 04143D were used as booing aircraft. The C.47 yes equipped
with an ARM*6 radio compass. The hallo with a Lear ADF-412. Both
day and night operational tests were accomplished. The weather on 50X1
both days was unfavorable for higher altitude tests. Ground con-
ductivity in the test area vas 2 millimhos, one of the lowest in
the
United States.
Parsonnal pondUcting_taAtA_Iimrit
50X1
TUN
TOD
TOD and
DWASS.
50X1
2. Observations: Test results are attaehed. Some general
observations were made during testing that should be noted, however:
a. Utilizing the *whip antenna on the tranamitter reduces
the reception range froa1/3 to 1/2. (ATB: Two more series of
comparison tests *Wild be made with the whip and the A-42 before
the 'whip is eliminated from consideration for operational use.)
b. Signal reception range in the Belie utilizing the Lear
ADW-12 receiver vas double that of the C.47 utilising the ABN-6.
c. Using the logy position on the.. ABS-6 will increase die-
tanee of aural reception about 1/3.
d. In the flat terrain at the testing site, reception
range was approximately the same in all quadrants.
e. Night operation reduced reception about 50%.
f. A radio covens needle innication is received on the
ARN-6 long before a signal is sudible. The needle indication and
signal audibility are almost simultaneous with the Leer 010.42.
G. Station passage indication on both receivers was
approximately the sane. In all eases the needle would begin to
fluctuate over the station and 2.5 to 11 semomoislater (depending
on altitude and type receiver) the needle 'mould stabilize in the
180? position. The Leer ABF-12 took 1/2 to 1 second less to co
plots the swing in most cases.
50X1
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SiGild
b, Heavy static was noted on the ARM4 beyond three miles.
The Lear ADP-12 filtered out most static at all ranges. Lightning
flashes were Observed frequently during night tests. Oeoasional
light precipitation was encounted during all tests.
1. Modification to the recording form are required. Forms
should include:
(1) 'city in area of tests.
(2) Frequency of breast.
(3) Type transmitter used.
(10 More spice is needed for remarks.
3. Conclusion: Reception range of the BRT-2/ARR-6 is poor,
especially at -night. In the present confimation (based on these
tests), this combinstion is not acceptable. The Lear A1F42/ARN.6
comparison tests indicate that the weak pert of the system is the
receiving equipment.
4. Pmeomesn4oicm4 Recommend that the Beacon Panel consider
one of the la/owing actions as the next step in the testing prOgrem:
\vs, Modifications to the AR3-6 be soconplished that will
ingrate* reception range to within acceptable stendeards.(CIQ-
b. A new receiver be developed.
A wore powerful transmitter be developed..
d. A new transmitter antenna be developed to increase
signal strangthato within acceptable standards.
e* Investigate the availability of an off-the-shelf
receiver thst would prothase better results.
testing
f. Atter correcting presently known deficiencies, repeat
during more favorable weather conditions.
Distribution:
243:401POSR
2-TSD/ADB
1-AC!DPD
1-WB/DPD
1-MB/DPD
1-COMMO/dpd
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--7,pQrT
Major
USAF
50X1
50X1
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' r
AOB TEST EVALUATION REPORT
10????? anew
The tests of the HRT-.2 Engineering Prototype were conducted on the
14th and 15th of September 1961 Attending as representatives
of TSD/A0B were and was
present for DPD.
The tests were preceeded by a preliminary investigation of the aircraft
ADF sensitivity. The aircraft involved was a C-47 equipped with ARN-7
Medium Frequency ADF and a Helio Courier on which a Lear Model 12E
system was installed. No check of antenna performance on either craft was
possible under the circumstances, so receiver sensitivity was the only
parameter tested. A signal of approximately 2. 5 microvolts at 1700 Ws
was supplied to the SENSE antenna input of both receivers, and satisfactory
indications with similar sensitivities were observed in both cases. The
beacon transmitter was set up by the ground party at
a frequency of 1720 kc/s.
The prescribed tests were run with results that differed widely between
the two aircraft involved (see data). With the C-47, stronger
signals were received with the ARN-7 ADF in the LOOP rather than the
SENSE mode, an unusual condition indicating inefficiency of the SENSE antenna.
The Helio Courier, on the other hand, received stable homing signals over
approximately twice the range received by the C-47 at distances in excess of
the specified requirement in the Test Directive. After the test was concluded,
discussions were held with maintenance personnel at Bolling Air Force Base
who provided the information that the Air Force has modified all C-47's to
use a "Blade" type SENSE antenna rather than the more efficient "long-wire'
previously employed. In order to more conclusively determine the capabilities
of the HRT-2 Beacon with the ARN-7/C-47 combination, it is recommended
that further tests be made. Any tests of this nature must involve the same
aircraft receiver and a long-wire SENSE antenna. The results from the present
test are, therefore, not considered conclusive.
The ground party found certain points where they felt improvement could
be made to ease installation and simplify operatioa el tam Season Teammatator
owl ANA/42 sateone. These were as isllerres
1. Captive lessive owl Womberet All oeveive *ad moslores on
removable pertlans of as traoseekter we sksoldi be et the "Captive"
type to prevent the loss of such parts and the defective waterproofing
which would result.
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2. Antenna Connections: Color coded, insulated sleeving should
be used to cover the braided cables which are provided on the base of
the ANA/42 antenna to prevent them from accidentally shorting.
Matching, color coded terminals should be provided on the transmitter.
3. Ground Rod and Cable: The ground rod buckles too easily when
driven into the ground and should be reinforced. The ground cable should
be easily detachable from the ground rod, or attached by some means
other than a soldered connection which pulled loose from the ground rod
when an attempt was made to remove it from the earth. An agent ground
party would not be able to re-connect the cable and rod in tht field under
the present circumstances.
4. Pilot Light: At night there is no way of reading the meter face
for tuning purposes. It is recommended that the small light adjacent to
the meter be directed at the meter face.
5. Battery: The battery case should have the correct insertion
position marked on the case in some manner. Perhaps a red dot on the
transmitter case to line up with a red dot on the battery would be helpful.
This measure is recommended because the battery plug in the transmitter
cannot be twisted to fit the battery regardless of position.
6. Antenna Lug (ANA/42): The band change lug on top of the ANA/42
loading coil should be of the sliding type. The present band-change lug
is difficult to move, and may not make positive contact unless care is
taken.
7. Meter Reading: It is recommended that an arrow pointing in the
appropriate direction be stenciled or otherwise marked on the transmitter
case directly above the tuning meter so that anyone tuning the device will
know that he is adjusting for a maximum indication.
8. Rf Energy Present on Transmitter Case: While using the ANA/42
antenna with the HR T-2, it was noted that the output meter reading
increased slightly when the ground lead was touched to the case, indicating
a slight difference of rf potential. Are these two points supposed to be at
the same potential? When using the 16' whip, the case was quite "hot''
for rf. Is it possible to improve the loading of the whip to minimize this
condition?
-2-
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1
9. Meter Reading Change: In the first few minutes after inser ing
a fresh. battery into the MR T-2, a slight decrease (about 15%) was
detected in the reading of the output power meter. Since mercury
batteries are noted for their constant voltage output despite rather heavy
loading. is there some explanation for this condition?
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