TAILOR TRANSMITTER MODULE EVALUATION

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A004200040007-0
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 5
• Document Creation Date: December 23, 2016
• Document Release Date: April 10, 2014
• Sequence Number: 7
• Publication Date: September 23, 1960
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2014/04/10: CIA-RDP78-03330A004200040007-0
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Office Memorandum � UNITED STATES GOVERNMENT
To : The Files
FROM :
SUBJECT: TAILOR Transmitter Module Evaluation
DATE: 23 September 1960
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1. TAILOR transmitter modules were received at the R&D
Laboratory for prototype acceptance tests. Enough modular units
were provided to assemble approximately seven complete systems
with A-1, A-2, and A-3 modulation with 0.5 and 5.0 watt RF output.
Three of these systems were assembled as plug-in versions for A-I
mode only. These three were subjected to tests first. Also, the
wire-together units were tested starting with the RF oscillator.
2. During the early phase of the evaluation, the test re-
sults showed serious shortcomings and as a result the tests were
stopped. A summary of test data obtained, up to the time the
tests were stopped, follow. Figures 1 and 2 show keyed waveforms
typical of Bands I and III.
3. Plug-in, 5 Watt, A-1, System
3.1. Test Results of System with Serial #125, Band
RF Power Output:
4.0 watts @ 3 mc
5.1 watts @ 5 mc
2.4 watts @ 7.5 mc
Keyed Waveform: Poor, 12 millisecond delay
Tuning:
Side Tone:
3.2. Test
Very difficult to tune from the
points of manipulation of knobs
and peaking of circuits.
Excessive earphone key click.
Results of System with Serial #128, Band II
RF Power Output: 4.3 to 5.8 watts 0 7.5 mc
6.1 to 6.9 watts 0 10 mc
5.4 to 6.5 watts @ 15 mc
Keyed Waveform: The RF oscillator ceases to key
when 1/2 watt amp. is peaked for
max. output.
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/10: CIA-RDP78-03330A004200040007-0
Declassified in Part - Sanitized Copy Approved for Release 2014/04/10: CIA-RDP78-03330A004200040007-0
CONFIDENTIAL
SUBJECT: TAILOR Transmitter Module Evaluation
3.3. Test Results of System with Serial #121, Band III
RF Power Output: 2.0 to 3.2 watts @ 15 mc
3.7 to 5.0 watts @ 20 mc
2.5 to 3.9 watts @ 30 mc
Keyed 'Waveform: Poor, 12 millisecond delay
Tuning: Difficult to tune to the correct
frequency.
4. Mire-together Systems
4.1. RF Oscillator Test Results, Band I (Comments)
a. Four out of five oscillators would not key at
the low end of the band.
b. All units exhibited delayed waveforms which
varied from 2 to 12 milliseconds.
c. One unit had 10 millisecond rise time at 7.5 mc
and 8 millisecond rise time at 5.0 mc.
d. One unit ceased to operate after short-time use.
e. Only one unit provided rated power output across
its band.
4.2. RF Oscillator Test Results, Band II (Comments)
a. All oscillators operated satisfactorily when
loaded with a 51 ohm resistive load except for
low power output.
b. The oscillator, when operating in conjunction
with the 0.5 watt amplifier, did not operate
satisfactorily. At the low end of the band
there was a delay in the keyed waveform which
varied from 2 to 4 milliseconds (unstable);
three out of seven would not key at the low
end of the band.
c. Only one unit exhibited satisfactory performance
as a 1/2 watt A-1 mode transmitter.
CONFIDENTIAL,
Declassified in Part - Sanitized Copy Approved for Release 2014/04/10: CIA-RDP78-03330A004200040007-0
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/10: CIA-RDP78-03330A004200040007-0
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CONFIDENTIAL
SUBJECT: TAILOR Transmitter Module Evaluation
4.3. RF Oscillator Test Results, Band III (Comments)
a. Four out of seven units failed to operate because
of voltage arc-over at the oscillator tuning capac-
itor. Two units exhibited low power output and
excessively delayed keyed waveforms. One unit
would not operate because of improperly assembled
band switch.
� 5. Conclusion: It is felt that time and effort would be
wasted to continue with the evaluation of this equipment unless it
Is desirable to hand-pick, say, one operable system from each mode
and power requirement. Even this selection is likely unobtainable
in some areas unless just barely operable units could be considered
acceptable.
The shortcomings of these units are felt to be primarily design
difficulties. The excessive delay in the keyed waveform is believed
to be caused by insufficient feedback. The stoppage of oscillation
of the RF oscillator when the 0.5 watt amplifier is peaked for maximum
power output is probably caused by too much feedback. The voltage arc-
over on Band III tuning capacitors is obviously caused by inadequate
voltage rating of that component. The cause for low power output
appears to originate at the oscillator, however, mismatch is apparent
in some cases.
The difficulty in tuning is caused by too many controls and
the difficult manipulation of these controls.
This equipment has DC to DC converters and antenna tuning
indicators which operate satisfactorily.
Attachments:
Figure I
Figure 2
CONF-136ENTIAL
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Declassified in Part - Sanitized Copy Approved for -Release 2014/04/10 : CIA-RDP78-03330A004200040007-0
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/10: CIA-RDP78-03330A004200040007-0
Declassified in Part - Sanitized Copy Approved for Release 2014/04/10: CIA-RDP78-03330A004200040007-0
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/10: CIA-RDP78-03330A004200040007-0