TRIP REPORT - CONTRACT RD-161, TASK ORDER 1 (SANITIZED) - CR-17 COLLECTION RECEIVER

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001200010002-7
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: August 2, 2012
• Sequence Number: 2
• Publication Date: March 31, 1961
• Content Type: MEMO

Declassified in Part -Sanitized Copy Approve~d~f~o~r~yRyelease 2012/08/02 :CIA-RDP78-03424A001200010002-7
STANDARD FOAM NO. B4 ~ ^~ ~'
C~ ~,+~~ ~ ~ ~~~~ ITED STATES GOVERNMENT
0 ce Meynorundu~ U N
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TO The Fil@8 DATE: ~. b~hrCh 1967.
rg~,~ ..a "~ O ._..~
[~ 29 March 1961 the undersigns v s e
COVering the frequency range
1. The CR-17 is a
teristics of s ec e ~
- CR-1'( CO11eC~lOII 1[scsavsr j
collection receiver
to discuss operating charae-
Yarticipating personnel xeret
25X1
25X1
25X1
25X1
2? Daring the R+D Laboratory's evaluation of GR-17 prototype
equipsent, channel 1 (of one of the receivers) became inoperative.
mceept for this malfunction, the equipment operated uniformly
throughout the tests; however, it was noted that although the
specifications called for reception of signal intensities up to
-20 dbm, the receiver xould saturate at well below this level,
with subsequent increases in input power resulting in reduced
output level. This effect xas so pronounced that xhen a -ZO dbm
sigtasl input level was infected into the receiver, the output level
was effectively blanked.
3. project engineer on the CR-17 program,
demonstra ? ~ lea a model 80 signal generator xas used input
levels up to b-'dbm xould not cause blanking. He the connected
the output of a pulsed Hewlett-taak?-~rd Model 6a8 to the input of
the CR-17 end deaonstrated that blanking does indeed occur when
this particular generator is used as the input source. His ex-
planation was that the circ~nitry deslsn of the Model 608 is such
that the CW is nrvsr completely cat off by an external puller.
This CFI leakage is rectified and at high inpa~t levels constitutes
the mayor part o! the total. DC energy being put int? the CR-17
receiver. 'flhen viewed on a scope, the pulse level appears to be
decreasing with Increased input; actually, the base line of the
output is moving gradually to the peak of the pulses. This is
not readily apparent to the observer because of the AC aoapling
which is used in the receiver. At any-rate, the CR-17 apparentlar
does have a capability for accepting input signals xith intensities
up to 0' dbm, although- limiting x111 be prsaent.
a
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Declassified in Part -Sanitized Copy Approved for Release 2012/08/02 :CIA-RDP78-03424A001200010002-7
 Declassified in Part -Sanitized Copy Approved for Release 2012/08/02 :CIA-RDP78-03424A001200010002-7
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3fJBJEG'T s Trio Revort -Contract RD-161. Task Oirder 1
Eft-17 Collection Receiver
4. who built the helical resonator bandpaas
filters for the CR-17, checked ont the inoperative cbannel of the
receiver and found the problem to be due to an extremslq high
insertion loss in the band one filter. Upon taking the receiver
apart, the cause of the high insertios- loss-vas obvious. One of
the tuning capacitors had been rea~usted sometime after leaving
the contract?r's plant. She plates of this capacitor vere actus].ly
touching and shorting out the filter. Read~ustaent of the filter
was readily aecw~7.ished and ve vere back in business again with
all four channels.
5. The sensitivity at low temsperatures reported in the A+A
evaluation is lase than would be desired; however, the receiver
now seems to meet all specifications in the most imporxeu~t areas
of consideration, and the units will be turned over to the customer
for operational e~l.oyment.
Distribution:
~AfD b`ub~ect Fil~
R+D Lab
Monthly ~2
EP Chrono
SPS
eFC~O-Tj L 1
CC~p~~ ~~~~TiAL
-2
Declassified in Part -Sanitized Copy Approved for Release 2012/08/02 :CIA-RDP78-03424A001200010002-7