TRIP REPORT - (SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03300A002300060006-3
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 23, 2016
• Document Release Date: May 8, 2014
• Sequence Number: 6
• Publication Date: August 23, 1957
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2014/05/08: CIA-RDP78-03300A002300060006-3
tiNFIDENTIAL
SE 23 AOgust 1957
P..
lW49 50X1
MEMORANDUM FOR: THE RECORD
SUBJECT : Trip Report -
50X1
1. TIME AND PLACE OF MEETING:
The meeting was
held 15 August
at
50X1
2. ATTENDANCE:
50X1
3. DISCUSSION:
a. P-144A -
Carrier Current System
Fifteen (15)of the Mark III prototypes
were returned to
Radio Receptor for modification. An investigation by
has 50X1
revealed that certain minor circuit changes in both
the transmitter and
receiver greatly improve the system
performance. These modifications
were discussed and it was agreed
that
would
send to the 50X1
undersigned a complete
list of
modifications made to the units
along with
suggestions
for future modifications and/or improvements. 50X1
In general the modifications to be made are:
(1) Transmitter:
(a) Change value of R213 to 5.6 K
(b) Change value of R216 to 56 K
These changes allow clipping circuit to clip symetrically
instead of only positively as was the case.
(2) Receiver:
(a) Physically relocate C112 to reduce oscillations
(b) Insert a "twin T" to block RF from the audio
circuits.
(c) Punch holes in
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Declassified in in Part - Sanitized Copy Approved for Release 2014/05/08: CIA-RDP78-03300A002300060006-3
Declassified in Part - Sanitized Copy Approved for Release 2014/05/08: CIA-RDP78-03300A002300060006-3
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(c) Punch boles in receiver case to reduce
operating temperature 200 C. The official
go ahead for this particular modification was
not given by the undersigned since it was
felt that members of APD should discuss this
in light of possible operational installations,
whereby the holes may prove disadvantageous. A
sample case was brought back to APD for dis-
cussion purposes.
(d) Remove from headset circuit. A different
headset jack is being considered and will be
incorporated, if possible.
All fifteen systems are to be modified and
on or before 30 September.
The proposal covering the general task for
was mailed from p 13 August 1957.
b. P-191A -VHF, Low Band, ASR-1
The first unit may be available by the latter part of
October. has selected a commercial standard "B" battery
for the receiver, but have been unable to locate a suitable commercially
available filament source. This problem will be investigated further
by and discussed with of APD during his next
visit. Several commercial batteries are presently undergoing life tests
at
returned to APD
the modifications
II.. GENERAL:
A Revere T-700 Recorder, Serial #11648, was delivered to 50X1
on an indefinite loan basis for their use while testing equipment 50X1
under development.
50X1
50X1
50X1
50X1
50X1
Distribution:
Orig. - P-144A
1 - P-191A
1 - Chrono
(23 Aug 57)
TSS/APD/EB
SVRET
CONFIDENMI-1.
50X1
50X1
Declassified in Part - Sanitized Copy Approved for Release 2014/05/08: CIA-RDP78-03300A002300060006-3