February 2016
Intermediate to advanced
216 pages
14h 38m
English
Content preview from Newnes Audio and Hi-Fi Engineer's Pocket Book, 3rd Edition
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175
F.m. tuner parameters
AM rejection ratio A 30% tone amplitude modulated r.f.
carrier is injected into the aerial circuit and the resulting output
compared to a 100% f.m. signal. The ratio is a measure of the
ability of the tuner to reject a.m. signals, particularly electrical
interference, although the latter being impulsive may not
always co-relate with the steady tone test. Values of 60 dB are
typical.
Birdie suppression A transmission on the adjacent channel,
spaced 200 kHz away, can beat with the tuned one in the
receiver circuits to produce a difference signal of 200 kHz. The
reconstituted 38 kHz sub-carrier produces harmonics, of
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