SUMMARY OF RS-6 SPECIFICATION DEVIATIONS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A000700130061-2
• Release Decision: RIFPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 23, 2016
• Document Release Date: September 11, 2013
• Sequence Number: 61
• Publication Date: January 1, 1952
• Content Type: MISC

Declassified and Approved ForRelease2013/09/11 : CIA-RDP78-03535A000700130061-2
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SIMMARY OF RS-6 SPECIFICATION DEVIATIONS
PARA COMENT
3.3.2. Approval of the RS-6 against this paragraph awaits correlation of our
drop test data with the contractors.
3.6.1. Approval of the RS-6 against these paragraphs awaits results of RS-6
3.6.2.
3.6.3. life test cycle test and cold test.
4.4.1. The RR-6 tuning indicator is required to swing through an arc of 10?
4.4.3.5.
the RR-6 indicator swings through an arc of 8.5?.
The RR-6 receiver calibration accuracy does not meet the requirements
of the specification. The contractor is not agreeable to hand cali-
bration and shall submit argument in the form of excessive number of
man hours necessary and doubtfulness of accuracy in accomplishing it.
The contractor claims the best condenser he can obtain in the required
size is calibrated to uuf., at each 10% roational point. Under these
circumstances the mathematical? error is greater than 100kc at 15 mcs.
Statistical data shows that .03% calibration accuracy is not had with
this condenser. Data on ten sets calibrated at 5% initial rotation and
phased at 15 mcs was requested.
4.4.4.1. The condenser which the contractor, wishes to use in RR-6 shall not be of
such precision as to allow .03% calibration accuracy.
4.6.8.1. A figure of 50 uv/meter with the field strength meter antenna at a distance
of one foot is cited by the specifications for the high frequency oscillator.
-A figure of 3 uv/meter is cited by the specification for the B.F.0 oscil-
lator. As the field intensity drops off as the cube of the distance from
DOCUMENTN
NO CHANGP IN A-igne oot. The field intensity of the BR) signal at 50 feet is extremely
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the radiating receiver, the radiated signal at a distance of 50 feet would
have a field intensity of .4 uv/meter since the maximum measured was 50k uv.
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4.6.8.1. low. Recommended values of field intensity of oscillator at 1 foot -
50k uv, of BFO oscillator at 1 foot 15k uv/meter.
4.6.10.1. The contractor can made 90db on cross modulation. The specification
says, Quote, "shall not exceed 100db". The specification should be
changed to read: "shall exceed db.
4.6.13. The RS-6xx receiver did not meet the .03% drift figure. Contractor
,indicated the RS-6 shall beproperly compensated. Tests data on RS-6
shall be necessary before the equipment can be approved in this respect.
4.6.15. This paragraph specifies that the receiver high frequency oscillator
shall not be pulled more than 100 cy. between gain control settings of
maximum Sensitivity and 200 k uv sensitivity. The RS-6xx sensitivity
range was from max. to 2 v. such that the oscillator was subject to .
greater loading than was called for by the specification. This sensi-
tivity range has been reduced on RS-6 and test data on R3-6 shall reveal
whether this requirement has been met.
5.2.1.2. The transmitter oscillator condenser and tank coils are not dual mounted
as required by this paragraph.
5.2.6. This paragraph requires that sufficient storage space shall be provided
for the transmitter power plug. This has not been done on RT-6xx. Con-
tractor states that he has redesigned the plug retainer to allow more
effective cord length and eliminate damage to the cord.
5.3.2. Approval has been given for a B current max of 82 ma on RS-6xx. Speci-
fications require that RS-6 B current be limited to 75 ma.
Transmitter RF. power output at specified frequencies and impedances as
per table in para 5.3.4. are not met by RT-6xx. The contractor has stated
that his minimum power output shall be 7 watts.
5.3.7. The keying characteristics of the RT-6xx did not meet the specifications;.
5.3.4..
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5.3.7.. RS-6 test data shall be required before approval can be given.
6.1.3.1. The transformer does not contain a separate 6x4 filament winding.
The contractor claims that because of the high input current on
vibrator operation a 20% regulation of such a winding with change in
B load would make it impractical for filament supply of 64.
The RS-6x does not comply with para. 6.1.3.5. with respect to adequate
fusing at all times. The contractor claims he has done the best he
can under the space limitations and also that a gross overload damages
the 6x4 before the transformer.
6.1.3.7. Whether the neon bulb input voltage indicator of RP-6 lights at the
recommended voltage or not depends on the limits of breakdown voltage
6.1.3.5.
re
and the percision with ehich the transformer is wound. The problem is
more with the bulbs and if we desire to retain this feature we must write
a tight production test speck.'
6.2.2.5. The contractor has given no indication that the RP-6 power transformer
is to be potted according to specifications although they claim they have
been working with various transformer manufacturers in an effort to
accomplish this.
6.2.2.6. Approval depends on transfolmer being coated.
6.2.2.8. The RP-6 case approval is pending data on drop test.
6.3.1. B current max. of 82 ma. has been approved for RS-6xx. A B current max.
of 75 ma. is required of RS-6.
6.3.2. With an increase of filter capacity in RS-6 power supply tests shall have
to determine the new regulation.
6.3.3.2. The conducted noise on the battery cables, according to the specification,
between 100kc and 40 mc, shall not exceed 10 uv or 2uv in the receivers
tuning and BFO ranges. The contractor measures a maximum at 150 kc'of
4.5oo uv and a 28 uv maximum in the receiver's range. Since operational
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6.373.3.
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the battery is an isolated generator this voltage is not likely to
cause interference.
The radiated noise from the battery cables as called for in para.
6.3.3.3. between 100kc and 40 mc is uv/meter except in the receiver
tuning and B.F.0 range where the maximum allowed is .2uv/meter. Below
the receivers tuning range the hash runs up to 15 K uv/meter at 150kc.
In the receivers tuning range the hash is so-weak it cannot be measured.
Since the I.F, rejection ratio exceeds 90db and the cross modulation
figure exceeds 90db the front end rejection to this noise is excellent.
In practice these deductions are born out as the hash pick up (the
receiver antenna as much away from the battery cables as is feasible)
4
is belola the site noise.
6.3.3.5. The contractor claims he has not found the means or the space to filter
to the extent required in the specifications.
6.5. The contractor has not submitted complete test data.
7.2.1. RS-6xx B current has been approved at a maximum of 82 ma. RS-6 re-
quirement states 75ma as B current maximum.
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