NOISE LIMITERS FOR (SANITIZED) RECEIVERS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03330A000800090002-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 1
• Document Creation Date: December 27, 2016
• Document Release Date: April 30, 2014
• Sequence Number: 2
• Publication Date: June 12, 1956
• Content Type: MEMO

Declassified in Part- Sanitized CopyApproved forRelease2014/04/30 : CIA-RDP78-03330A000800090002-8
INFIUL.I i
ce Memoi;andum � UNITED STATES GOVERNMENT
O&T 56 zy
-
TO
FROM :
SUBJECT:
Chief, Engineering Division, OC
Chief, Operations and Training Division, OC
Noise Limiters fo
Receivers
DATE:
1 2 JUN MR
50X1
1. In the past, the design of radio receivers has 50X1
largely ignored the problem of elimina ing impulse noise interference
of the type caused by domestic and industrial equipment and automobile
ignition systems. This is an undesirable weakness in equipment which
is frequently required to operate in urban centers and other high
noise areas.
2. It is believed that the addition of a simple series noise
limiter circuit to the audio systems of all future receiver designs
can be accomplished without appreciable increase in size and weight.
It is also recommended that a noise limiter be incorporated in the
RR-11AA, BB receivers now being developed if this is at all feasible.
3. It is pointed out that the commonly used second detector
noise limiter is useless on CW; therefore only audio types should
be considered.
ROC AL____ REV DATE ..1.1019--- BY _VAL_
CMG cemp _I1___ GPI Sit-- TYPE
f,RIG CLASS __S__ PAGES ___/____ REV CLASS -L.-
\JUST ____201.- NEXT REV 2SOL____ ACTH: HR 10,4
CONFIDENTIAL
STAT
Declassified in Part - Sanitized Copy Approved for Release 2014/04/30: CIA-RDP78-03330A000800090002-8