TRIP TO(SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A002400020045-6
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 22, 2016
• Document Release Date: September 20, 2011
• Sequence Number: 45
• Publication Date: February 26, 1954
• Content Type: MEMO

Sanitized Copy Approved for Release 2011/09/20: CIA-RDP78-03424AO02400020045-6
Files, Rs-6
26 February 1954
RRRSNCB: Contract P8C-148-UAV
1. Purpose of trip:
a. To discuss the means to be taken to reduce HFO radiation
and oscillator pulling in both the RR-6 and the RR-6A.
b. To evaluate whatever steps had been taken at the con-
tractor's plant to correct the above faults on the
production line.
c. To evaluate the method of test used in connection with
the measurement of RFD radiation.
d. To discuss any production problems with the contractor
and the Navy Inspector.
2. On arrival at the plant we were met by the Navy Inspector and
were escorted to the RS-6 production line. The following observations
were noted:
a. The critical oscillator lead was not being dressed out of
the RF coapartment.
b. It was found that the 11 and the 5% tests (this includes
the RFD radiation test) had been waived by the Government.
c. The Navy Inspectors had two complaints found in an average
of one unit out of twenty. These were : low audio output
of crystal calibration beats and attenuation of received
signals on break-in operation.
3. Regarding the RS-6&, the contractor exhibited the steps he has
taken to correct oscillator pulling and 8FO radiation. These include
the recommendations of the Government and additional isolation of the
variable bias line. Stops had not been taken to correct the trouble in
the RS-6. The improvements in both the above cases were explained in
terms of the magnitude of the oscillator pull rather than in terms of
oscillator radiation.
Sanitized Copy Approved for Release 2011/09/20: CIA-RDP78-03424AO02400020045-6
 Sanitized Copy Approved for Release 2011/09/20: CIA-RDP78-03424AO02400020045-6
4. An investigation of the test used to measure oscillator radi-
ation at the contractor's plant shows that the method is not adequate
for measuring the radiation properties of a "Front end" deluged with
oscillator voltage. The present method apparently effectively measures
case radiation. The early Rs-6 3 and the corrected units shoe that
this is true. Sven with a 27' antenna directly over the Stoddart loop,
a corrected unit will not indicate antenna radiation above care radia-
tion. The only reasonable method is to measure the oscillator directly
on the receiver antenna terminals and to isolate the measuring instru-
ment (receiver) from the case induction field. The method must be
standard. The use of a Stoddart unit in a field check will be helpful.
5. As the amount of oscillator voltage found on the RF grid is
directly proportional to the oscillator pulling, a shift of not more
than 3 kc will be allowed taaporarily, as a measure of oscillator radi-
ation. This is good insurance, but is not a guarantee that the radiation
is within limits. It is felt that a direct method of s surement is
required. We propose taking the following steps:
a. We are sending the contractor a previously submitted
prototype of the RR-6& for modifications to reduce BFt)
radiation and oscillator pulling.
b. After he has modified this unit in accordance with our
recaammndations and his further study, 'e,asurenents
will be taken here on the returned unit as per para-
graph (d) below.
c. Institute a simple 100% factory cagWison check, using
the 8toddart if possible, to show that antenna radiation
does not exceed ease radiation.
d. We request that the 1% and 5% checks be performed by
the contractor. For oscillator radiation tests we
recommend the application of MIL-16410 and Amsa t nt #2
(Fig. 39). It would be well to have the contractor
set up for the above checks and have one of our people
witness measureoents on at least tee units from which
a production limit in microwatts an the receiver pri-
mary antenna coils can be net. The oscillator pull
should not be greater than 2 ke.
e. Institute a study at the laboratory to measure radiation
in the field in order to study the effect of antenna
radiation, case radiation, and BF0 radiation of present
agent oquiperent. Evaluate ease of DF.
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 Sanitized Copy Approved for Release 2011/09/20: CIA-RDP78-03424A002400020045-6
6. The following items were erentioned by the Navy Inspectors as
sources of trouble found in about one in twenty units:
a. The crystal calibration beats do not come through with
sufficient audio power at the high end of the high band.
suggests by-passing the audio
stage ca a resistor with a .001 of condenser. This
was found to be the solution for obtaining higher cali-
bration oscillator output on the RR-6A#
b. There is an abnormal attenuation of signal fed through
the transmitter relay on break-in operation in the re-
ceive position. The NavyInaDector will bring these
units to the attention of for evaluation.
c. The die cast receiver cases are coning in from the sub-
contractor with a small surface crack on the bass cast-
ing just over the opening for the power plug stooge
area. It was suggested to the Navy that these cases
be rejected before the receiver is asseabled, and that
the subcontractor be further consulted and, if necessary,
grind dawn the die in this area to build up the corner
wall thickness.
OC -E/R&D/AJS/ljm
cc: OC -E
R&D
Chrono
Dev/s
Sanitized Copy Approved for Release 2011/09/20: CIA-RDP78-03424A002400020045-6