TRIP REPORT NO. 2 - RADIO CIRCUIT DEVELOPMENT

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001100010017-2
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: September 19, 2011
• Sequence Number: 17
• Publication Date: November 28, 1958
• Content Type: MEMO

Sanitized Copy Approved for Release 2011/09/19: CIA-RDP78-03424AO01100010017-2
STANDARD FORM NO. 64
UUN IIUU tl !AL
Office Memorandum UNITED STATES GOVERNMENT
T00.5
suBJECT: Trip Report No. 2 - Radi lopment-?
a. The output was distorted when the BFO was
set to produce a frequency below 2.5 kco
Above this frequency a signal could be passed
through the receiver without distortion.
b. Receiver drift was excessive and prevented
frequency measurements*
c. Spurious oscillations were noted when there
was no input signal applied and they appeared
to be periodic. Because of slippage of the
tuning dial, no measurement was made to
determine at what periodic rate these oscil-
lations appeared.
CO DEN
1. On 24 November 1958 a visit was made to the R&D Laboratory
to observe the malfunctions of the receiver test vehicle and the
selective call system.. Persons present during these observations were:
25X1
25X1
OC-E/R&D-IP 25X1
- OC-E/R&D-IP (part time)
-/- 25X1
2. The receiver teat vehicle was just returned fro 25X1
where general inspection was made to e25X1
spurious oscillations reported by this Agency, project 25X1
engineer, stated that he could not make the receiver act as it had in
the EP office during his last visit. During that time, thumping or
pressing of its sides would create howls and squeals and one could
hear general oscillations in the ear phones.
3. Upon my arrival at the R&D Laboratory, stated that 25X1
the receiver still had spurious oscillations and that because of these
oscillations he could not make an efficient evaluation. He also stated
that the selective call system did not perform when using the code
indicated in the Final Report 25X1
4. Using a signal generator and an oscilloscope with the receiver
set for the CW mode of operation, the writer observed the following:
I A L
DATE: 28 November 1958 25X1
Sanitized Copy Approved for Release 2011/09/19: CIA-RDP78-03424AO01100010017-2
 Sanitized Copy Approved for Release 2011/09/19: CIA-RDP78-03424AO01100010017-2
Co
NF
DEN1fAL
d. In the AM mode of operation the incoming
signal with 30% modulation at 400 cycles
was distorted and harsh to the ear,
e. Spurious oscillations were also noted in the AM
mode of operation.
f. The ON/OFF, GW and AM switch was difficult
to place on a particular mode of operation
because of mechanical slippage.
5. When inspecting the encoder of the selective call system,
the operation was noted to follow a decaying action. This decaying
action was such that the start pulse, after several firings, would drop
out. Continuing the firing without adjustments, the last pulse would
also drop outaof the.pulse or code sequence. From this point on,
any one of the remaining pulses may or may not drop out. It was noted
that by resetting the insert button on the encoder after each firing
sequence, full pulse information was restored and the equipment
operated satisfactorily. The decoder of the selective call system
would.not even function. It was later determined that a 2N165
transistoh in the Schmitt trigger oscillator was defective. Having
none of the 2N165 transistors in stock, no further effort was made to
place the device in operation.
6. The writer called and requested that several 2N165 25X1
transistors be, supplied to reps decoder. In discussing the
decaying action of the encoder, stated that the multiplier 25X1
circuit, which counts by thirteen, may be affected by temperature
and thus cause this, decaying action. He further stated that a very
slight adjustment could be made by removing one or two of the windings
on T--l which can be located in Figure 7 of the Final Report.
CONFIDENTIAL
Sanitized Copy Approved for Release 2011/09/19: CIA-RDP78-03424AO01100010017-2