July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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174
Lower side band
retained
60 kHz
Oscillator
64 kHz
Upper side band
removed by filters
68 kHz
63.7 kHz
(300 Hz audio)
60.6 kHz
(3400 Hz audio)
(a) Production of side bands in frequency division multiplex
(b) Production of basic group B
(c) Production of groups A and B
Group A
(originally Group B and
now erect)
12 11 10 3 2 1
64 68 72 10096 104 108
Channels
group B
Base band
Channels
Channels
Group
carrier
12 3 101112242322 151413
12 kHz 60 kHz 108 kHz
120 kHzGroup B
(inverted)
Oscillator frequencies (kHz)
Figure 13.1 Frequency division multiplex
mixed with 120 kHz to produce a lower side band of 12 to 60 kHz,
now basic group A. Filters leave 60 to 108 kHz free for a new
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