OPERATIONAL TEST OF THE MODIFIED PORTABLE AUTOMATIC MORSE KEYER AND PERGORATOR, (SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A000800120017-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 27, 2016
• Document Release Date: April 30, 2014
• Sequence Number: 17
• Publication Date: March 28, 1957
• Content Type: MEMO

rvr-- r
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120017-8
, 10[71""
Office Memorandum � UNITED STATES GOVERNMENT
TO :
The Files (R&D Branch)
DATE: 28 March 1957
FROM :
50X1
SUBJECT:
Operational Test of
the Modified Porthble Automatic Morse Keyer
and Perforator,
50X1
REF :
(a) Memo O&T 56-600, dated 25 October 1956
(b) Memo O&T 56-601, dated 25 October 1956
(c) Memo ENG-6-1268,
dated 20 November 1956
1. A Portable
Automatic Morse Machine (Keyer KY-201,
50X1
Serial #11- and Perforator Th-2i, Serial f4) was modified at the R&D
Laboratory to correct the operational and functional deficiencies
listed in Ref. (a) and Ref. (c). An additional modification was
made on the keyer by replacing and reforming the feeler contacts
on the keying head.
2.
by the A&A
and keying
(a)
(b)
Operational tests of the modified units were conducted
Section, R&D Laboratory. The results of the perforating
tests follow:
The Perforator TH-24 A was utilized to punch
and compile International Morse code groups on standard
1/4 inch mylar audio recording tape. The Perforator per-
formed satisfactorily during these tests.
50X1
The tests conducted on the Keyer KY-201 A while 50X1
keying an RT-3 transmitter produced accurate and satis-
factory copy. Link paper tape recordings were made of
the keyed transmissions as received on a Hammarlund
SP-600 receiver and recorded on a McElroy RAPC Amplifier
Recorder. During the final tests of the keyer, perfect
copy recordings of the keyed transmissions were made.
(c) The "Lo" speed of the keyer was 21 words per minute
+0.5 wpm.
(a)
(e)
The "Hi" speed of the keyer was measured to be 50 words
per minute 4-1 wpm.
The keyer gear train ratio is 3:1 and should provide
either 20 wpm or 60 wpm keying. The 2.5:1 ratio
observed during the operational tests is attributed to
additional friction loads placed on the spring motor
through the tape pull mechanism during hi-speed keying.
-1--
\ ROC
S_� PaRES ---e---.4 iL h REV
JUST --32.----- NEXT REV -v''---. AUTH: NB 10.4
;71:V VA; EV-31/41._ SY
TYPE _Id-67-
tLASS
S ET ,,,,,
ORM CLASS _
_�
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120017-8
_
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120017-8
Recommendations
aLt, LI
(a) The Perforator TH-24 #4 is considered to
be an acceptable engineering model.
(b) The Keyer KY-20l'4 is considered to be
an acceptable engineering model. The keying tests
indicate that the keyer performance is good; how-
ever, considerable adjustment of the keying contacts
was necessary to produce perfect copy transmissions
during hi/lo speed keying tests. Long-time relia-
bility tests were not made on the keyer because of
the lack of time.
Attachment: Test Tape
CONFIDENTIAL
SE*1
50X1
50X1
50X1
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800120017-8