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Newnes Radio and RF Engineering Pocket Book, 3rd Edition
book

Newnes Radio and RF Engineering Pocket Book, 3rd Edition

by Steve Winder, Joseph Carr
July 2002
Intermediate to advanced
344 pages
8h 37m
English
Newnes
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
16.4 Standard PSTN tones
Signal
UK USA
Tone
Frequency
Sequence
Frequency
Sequence
Number unobtainable 400 Hz Continuous 500 + 600 Hz Interrupted every second
Number busy 400 Hz 0.75 s on, 0.75 s off 480 + 620 Hz Interrupted once per second
System busy 400 Hz 0.4 s on, 0.35 s off, 480 +620 Hz Interrupted twice per second
0.225 s on, 0.525 s off
Dial tone 50 Hz 350 + 440 Hz
33.3 Hz
Ringing tone 400 Hz, or 0.4 s on, 0.2 s off, 440 + 480 Hz Interrupted once per second
400 + 450 Hz, 0.4 s on, 2 s off
modulated by
17, 25, or 50 Hz
Pay tone 400 Hz 0.125 s on, 0.125 s off
Time tones 900 Hz 0.15 s on, 0.85 s off. Three
times every three minutes
Recorder warning 1400 Hz
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Publisher Resources

ISBN: 9780750656085