FOIA
TRIP REPORT - LINEAR EXCITER FOR AS-4/AS-4A, CONT RD-103)
Document Type:
Collection:
Document Number (FOIA) /ESDN (CREST):
CIA-RDP78-03424A000500060004-8
Release Decision:
RIPPUB
Original Classification:
S
Document Page Count:
5
Document Creation Date:
December 22, 2016
Document Release Date:
February 22, 2012
Sequence Number:
4
Case Number:
Publication Date:
December 31, 1958
Content Type:
MEMO
File:
| Attachment | Size |
|---|---|
 CIA-RDP78-03424A000500060004-8.pdf | 643.84 KB |
Body:
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Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A000500060004-8
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?
ce Memorandum ? UNITED STATES GOVERNMENT
The Files - Contract RD-103, T.O. 9
25X1
DATE:31 December 1958
SUBJECT: Trip Report - Linear Exciter For AS-4/AS-1A/ r' /? P /
25X1
on 8 end December to monitor 25X1
progress an Contract , . 9, the AB-4 AS-4A linear exciter.
2. Attached is a chart sharing various Collins' linear
Parer Amplifiers and linear Exciters. The recomended 45 kilvvatt,
205 J-1 Paver Amplifier can be procured in 8 months for $48,500; the
310 7-1 Exciter in 9 months for $17,850.
4( \
APR
OOC ,_ lREVV OATS 2 1980 BY
0810 COMP 033 OP. _ :Qk TYPE 0 ~
0Ri0 CLASS PAGES REV CLASS C--'
JUST - NEXT REV 4/0 AUTH: HR 104
CONFIDENTIAL
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A000500060004-8
25X1
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A000500060004-8
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A000500060004-8
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Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A000500060004-8
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CO F I IAL
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'i iAL DISCUM
Introduction
The M-A and MAA have her.tcrom been latesded for operation
exclusively with the 231-D-DO trsmssitter. IM 231-D-20 25X1
is a fr.gwncy quadrupler and nonlinear amplifier. It L driven IV the M4
and AS-4A with rectangular r.f. Palms at one-grantere desired output
frequency. Naveshaping for splatter prevention is aaoaglished in the higb-
level plate modulator. The modulator also serves to dodle the peak plate
voltage to the r.f. power wiplifi.er, the. iacreaslag its palsy power output
from 3 to 12 kilowatts. {'V
It is am desired to operate ABA sad A2-b A trsmsuitting teruiaals
into the Collins 20541 linear saplifier. '!De adAmtaps to be gained are that
45 kw output can be achieved (6 db 3mprove^ant) mad the frequency reap is
increased from 4-26 megagclas with the 231-D-20, to 2-30 with the 20541. In
addition, it uses servo timing as contrasted with =640 ss; ties the 20541
servo system accouodates an u ale acted m caber at fftqum q aseipuents, as con-
trasted to 10 preset frequencies for the 231-D-a0* i!e 205-461a also acre
suitable for general purpose use, being a Buena saDllftsr.
The 20541 amplifier is morally used with the 31Cr series or
S exciters. Tlrse exciters isaluie a frequnq quthrsirr wiioh determines
the output frequency-of the treesaitter. on s Nthssiser also provides the
rain tuning information rewired by the 20541 soliftar. On of the 31CIF
as a single-sidebssd exciter with the 20541 linear s^pliti+sr also permits
narrow-band (2.2kc) operation with the, A$-4A, frsdimg the 31CV tram the audio
frequency output or the Trasait Data Thrsisal for use on "se ' high-frequency
circuits mere anltipath is not a serious probls..
signal input to the 31V mq be at ardiov for emerartion or upper.
and/or lower single-sideba output; or it mq be relatively brooM and In the
300 kc region for translation (or hater dyaiag) to the fregm ww set by the
synthesizer.
Approach .,,
It is apparent that the proposed M-h'ma A8-MA exciter should be
designed for output at 300 kc. aesatised rrsqusmq Modulation, or WK, will be
generated at this frequency, and the pulses will be wowesbaped in the proposed
CONFIDENTIAL
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A000500060004-8
Items 1 - 3: LTQAit ==M rat M M- AND 1SAA
Declassified in Part - Sanitized Copy Approved for Release 2012/02/22 : CIA-RDP78-03424A000500060004-8
25 April 1958
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exciter for minimum. bandwidth. Cosine-squared waveshapes vill be approximated
for rapid convergence of, the pulses' frequency spectra. Then the 31(7 exciter
vill translate this WW signal to the desired pet freque c; for amplification
to the 45 kw level in the 20541 amplifier.
This approach avoids the most difficult and expensive functions
performed by the present ABA and AS-11A exciterst 1) no variable-frequency r.f.
circuits are encountered since operation is fixed at 300 kc; and 2) precisely
controlled oscillators are not required in the ABA and AS-h-A, because the 310E
synthesizer determines the output frequency. These two simplifications will
result in very simple electrical and mechanical design compared to existing
ABA and AS-hA exciters for,the 231-D-20 tremsuitter.
The proposed exciter should be considered sg additionbo the ABA
and AS-2A,.rather than as a replaaemeat for the present variable-frequency one.
Thus with the proposed exciter installed In addition to the existing one, the user
may operate into either a 3107 and 20541, or into the 231-D-20 transmitter.
will desigt, develop and fabricate one (1) 25X1
linear exciter pets use a -k and AS-A with the '31(7 and 20541.e p-
sents. This exciter will operate at 800 or 960 pulses per second (for the AS-k_
and AS-hA respectively) at the throe of a switch. W
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