OPERATIONAL EVALUATION, PORTABLE AUTOMATIC MORSE KEYER, (SANITIZED)(PAMM)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A000800120026-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 5
• Document Creation Date: December 27, 2016
• Document Release Date: April 30, 2014
• Sequence Number: 26
• Publication Date: October 25, 1956
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120026-8
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Office Memorandum/
? UNITED STATES GOVERNMENT
TO : Chief, Engineering Division, OC
FROM : Chief, Operations and Training Division, OC
DATE:
O&T 56- 6 oe
25 OCT 1956
saRRKI% Operational Evaluation, Portable Automatic Morse Keyer,
(PAMM)
1. The Operations and Training Division has completed a pre-
liminary operational evaluation of the Several defects
were noted and are desctibed in the following paragraphs together
with some suggestions for improvement.
a. The keying is erratic. This is due to either poor
design or mal-function of the keying head, or both. Two
unsatisfactory features of the keying are:
(1) The locking device on the moving segment of
the head has excessive play permitting variation in the
position of the back key contact.
(2) The spring which holds the rear keying contact
appears too flexible. This spring tension should probably
be adjustable.
b. The perforator does not always cut the morse character
perforations parallel to the tape sides nor are they always
centered on the tape. This is very likely a contributing cause
of the erratic keying. The perforations are mis-aligned due to
the fact that the plate covering the chad box and tape punch
slot is not held firmly closed due to weak spring tension. This
permits the tape to move vertically in the punch slot with the
motion of the operator and causes the characters to be cut at
an angle or off center.
c. The cord connecting the keyer to the transmitter is
entirely unsatisfactory. It is much too large in diameter and
too inflexible. This cord should be replaced by one more suited
to miniaturized equipment and should be equipped with a dis-
connect plug at the keyer end and phone tips at the other end,
d. The slow keying speed should be increased to ap-
proximately 20 WPM instead of the present 10 WPM.
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120026-8
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120026-8
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O&T 56- 6900 1"" 11
Page 2
e. The keyer would probably be operated with the
cover open under actual operational conditions to ex-
pedite tape reruns. It should be possible to rewind
the spring motor without closing the cover and thereby
risk damage to tape in the machine.
f. The covers over the tape slots on the perforator
do not have a positive lock action in the open position
and interfere with the tape movement.
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120026-8
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A00080012066-8
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(a) Erratic keying - provide positive positioning of the'r
keying contacts to insure proper action when keying.
(b) Chad box cover assure positive closure on chad box
cover.
(c) Interconnecting cord too large and bulky - install
Telex Quick Disconnect receptacle on keyer box and
supply a Telex cord with phone tip connectors on one
end and Telex plug on the other.
(d) Increase slow keying speed from 10 to 20 WPM - ,change
the gear ratio. Estimated time_is_35 days of-ithich
30 days is procurement time on two gears required if
these gears can be obtained from a manufacturer's
stock. The procurement time will be 90 days if they
must be made to order.
(e) Provision for winding motor while reels are turning
with cover open - build a plastic winding key to fit
over the fingers of the winding mechanism.
(f) Tape perforator slot covers do not positively lock in,
open position - reform slot cover holders.
(g) Vertical wobble on take-up reel prevents operation of
the keyer when the cover is closed since reel strikes
cover. Machine clearance in case.
(h) Inconsistent spacing between letters and words -
increase spring tension on the indexing pressure
roller.
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120026-8
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120026-8
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120026-8
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120026-8
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ROUTIN AND ECORD SHELT _..../
INSTRUCTIONS: Officer designations should be used in the "TO" column. Under each comment a line should be drawn across sheet
and each comment numbered to correspond with the number in the "TO" column. Each officer should initial (check mark insufficient)
before further routing. This Routing and Record Sheet should be returned to Registry.
FROM:
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NO.
O&T 56- COO
DATE
2 5 OCT 1956
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FORM NO. gl n PREVIOUS EDITIONS
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16-61155-3 U.S. GOVERNMENT PRINTING OFFICE
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120026-8
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