A Circuit for Improving the Adjacent-Channel Rejection of an IFF Receiver

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Abstract:

A "discriminating" second detector has been developed which can be used to reduce the frequency range over which a receiver will respond to pulse-modulated signals. This provides a means for improving the off-channel rejection of a receiver for pulse-modulated signals. The operation of this circuit is discussed and some experimental results are presented. The experimental results just discussed show that the discriminating detector provides a means for increasing the off-channel rejection of a receiver for systems employing pulse-modulated signals with the possible exception of systems wherein there would be simultaneous signals on adjacent channels. In the latter case, the exact specifications of the system would have to be known in order to determine the effect of adjacent-channel interference and thus determine if the circuit could successfully be used in the system.

Author(s):
Lynch, D. W.
Author Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC
Funding Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC, WASHINGTON, DC
Document Type:
Technical Report/Formal Report
Publication Date:
1949 Dec 07
Pagination:
20

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release.
Copyright: Not Copyrighted

RECORD

Collection: TRECMS
Identifying Numbers
Project Number(s):
Subject Terms
Descriptor(s):
frequency bands, frequency, iff systems, military research, bandwidth, detectors, measurement, schematic diagrams, abstracts, amplifiers, amplitude, couplings, discriminators, frequency response, gain, losses, microsecond time
Keyword(s):
Circuit, Adjacent-Channel Rejection, iff(Identification, friend or foe), IFF Receiver
Subject Categories:
Navigation, Detection and Countermeasures; Electrotechnology and Fluidics; Test Equipment, Research Facilities and Reprography
Descriptor(s):
frequency bands, frequency, iff systems, military research, bandwidth, detectors, measurement, schematic diagrams, amplifiers, couplings, discriminators, frequency response, gain, losses, microsecond time, rejection, spectra
Creation Date:
2023 Oct 25
Update Date:
2023 Nov 13