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Foundations of Wireless and Electronics, 10th Edition
book

Foundations of Wireless and Electronics, 10th Edition

by M. G. Scroggie, S. W. Amos
October 2013
Intermediate to advanced content levelIntermediate to advanced
570 pages
27h 46m
English
Newnes
Content preview from Foundations of Wireless and Electronics, 10th Edition
247
MODULATING
A.F
INPUT
^
GRID
BIAS
±C
Fig. 15.3 Outline of Heising method of amplitude modulation
It used to be common practice to use a single inductor (a 'choke
coil') in place of the transformer, and to connect the final a.f.
amplifying valve across C, so that it was fed from the same source as
the r.f. valve. This form of anode modulation was known as choke
control.
Because of the large amount of power and heavy equipment
needed for anode modulation, the a.f. voltage was sometimes
applied to the grid. This was not so simple or satisfactory as might
have been expected; it tended to increase distortion and certainly
reduced the r.f. efficiency ...
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Publisher Resources

ISBN: 9781483105574