Portable battery-operated detector indicates the presence of steady state signals exceeding a predetermined value over a wide frequency range by the closure of output relay contacts. It was designed to monitor electronic equipment used in the Saturn 2 program

Deutsch, W. F.

Jarminski, S. J.

Wheatley, C. E.

English

NASA Technical Reports Server

October 1967	 Brief 67-10386 
NASA TECH BRIEF	
"& 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Continuous Wave Detector Has Wide Frequency Range 
A small, portable, battery-operated detector, de-
signed to monitor electronic equipment used in the 
Saturn II program, indicates the presence of steady 
state signals exceeding a predetermined value over a 
wide frequency range. The indication is provided by 
the closure of output relay contacts. The contact 
closure occurs and is maintained when the steady 
state input signal is within the frequency range from 
400 Hz to 500 MHz and the amplitude of this signal 
exceeds a preset threshold voltage within the dy-
namic range of 1.0 millivolt to 3.0 volts rms. The 
threshold voltage is manually adjustable within the 
dynamic range of the detector. The frequency range of 
the detector is divided into two frequency bands: 
namely, an LF band extending from 400 Hz to 200 
kHz and an HF band extending from 200 kHz to 
500 MHz. Band selection is accomplished by a manu-
ally operated switch.
Note: 
Inquries concerning this circuit may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B67-10386 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C. 20546.
Source: W. F. Deutsch,

S. J. Jarminski, and C. E. Wheatley

of North American Aviation, Inc.

under contract to

Marshall Space Flight Center

(MFS- 1849) 
Category 01 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
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Continuous wave detector has wide frequency range

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