DEFECTS OF THE MODIFIED AN/UGT-1 (PAMM PERFORATOR AND KEYER)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A000800120002-4
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 27, 2016
• Document Release Date: April 28, 2014
• Sequence Number: 2
• Publication Date: May 31, 1957
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2014/04/30 lJ : CIA-RDP78-03330A000800120002-4
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STANDARD FORM NO. 64
Office Memorandum � UNITED STATES GOVERNMENT
TO : The Files (R&D Branch)
FROM :
SUBJECT: Defects of the Modified AN/UGT-1 (PAW Perforator and Keyer)
REF : Memo - Chief, R&D/EP to Chief, R&D/IP dated 1 May 1957
DATE: 31 May 1957
1. In response to the above referenced memo the AN/UGT-1
PAMM Perforator Th-24 h and Keyer KY-200 #1 were examined by the
Mechanical Section, R&D Laboratory, to determine the causes of
defective operation and faulty keying. The following is a resume
of the mechanical inspection and repair, and the operational test-
ing of the units.
2. Perforator TH-24 h
(a) The unit failed to operate correctly due to the
excessive lubrication of parts and the failure
to clean the chad box of excess slugs. These
conditions caused the waste chad to adhere to
the oily metal surfaces of the tape slot and dies,
thus fouling operation of the unit. The operating
handbook for the Perforator, Set, Tape, Telegraph
AN/UGT-1 underscores a word of caution and states:
" DO NOT LUBRICATE -- To do so will foul operation of
the unite
(b) The Perforator was disassembled, cleaned, and re-
assembled.
3. Operational Test Perforator TH-24 #3
(a)
The Perforator correctly punched and spaced all
characters of International Morse Code on 1/4
inch mylar magnetic recording tape.
(b) Control of the word and letter spacing is provided
by a variable eccentric pawl adjustment located
between the punch and die assembly and the indexing
clutch. This control was not found on a unit (Ser-
ial ji4) which was previously tested and was found
to key at 50 wpm. This control provides a spacing
range of 3 to 6 baud spaces for letters and 7 to 12
baud spaces for words.
(c)
The variation between letters punched on the tape
averaged 4-1 baud.
SECRET
STAT
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Declassified in Part- Sanitized Copy Approved forRelease2014/04/30 : CIA-RDP78-03330A000800120002-4
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(d) The variation between words averaged + 1.5 bauds.
(e) The Character Selector Dial of Perforator #3 fails
to align the selected character with the index mark
on the case. Since the dial stops between two charac-
ters, this condition causes operator confusion when
selecting characters to be punched. The Mechanical
Section, R&D Laboratory, cannot suggest an immediate
remedy for this defect. It is considered to be due
to mechanical tolerances not being held close enough
during the manufacture of the perforator components.
It is further noted that this defect may not be rep-
resentative of similar units.
4. Keyer KY-201 #1
(a) The unit was found to be defective due to missing
pins in the speed-change gears, a loose gear, dirty
capstan threads, and fouled keying contacts. The
take-up reel is missing.
(b) The unit was repaired and placed in operating con-
dition.
(c) The primary cause of defective keying has been
determined to be due to the four wire spring con-
tact falling out of alignment during continued
usage of the keyer. It has been observed in
similar keyers that the four wire spring contact
rotates or twists on its mounting shaft so that
the wire springs hook each other and become fouled.
Since the four wire spring contact is hand-made,
considerable care is required to assure that the
springs are equally separated,and securely posi-
tioned on the mounting shaft. Also, the wire
springs must be Similar in every respect so that
the contacting ends of the springs do not foul
each other.
5. Operational Test Keyer KY-201 #1
An operational test of the keyer unit provided the follow-
ing information:
(a)
An RT-3 transmitter was keyed by the keyer unit #1.
The transmissions were monitored by an SP-600 re-
ceiver, and recorded on link paper tape using a
McElroy RAPC recorder amplifier.
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Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120002-4
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120002-4
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(b) During all transmissions perfect copy tapes
were received and recorded.
(c) The low keying speed of keyer #1 was measured
to be 24 wpm-4- 0.5 wpm.
(d) The high keying speed of keyer #1 was measured
to be 60 wpm 4- 1 wpm.
(e) The word spacing on the transmitted messages
was set for standard spacing (5 bauds 4-1 baud
6. Recommendations
The following recommendations are based on test results.
(a) Spare keying contacts should be made available for
easy replacement of worn or fouled keying contacts
in current models of the keyer units.
(b) The practicality of the development of precision
machined keying contacts, rather than band made
contacts, should be investigated.
STAT
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120002-4