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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10 Radio equipment
10.1 Transmitters
10.1.1 Transmitter functions
The functions of all transmitters and the terminology used to describe
them, irrespective of the modulation method, are:
1. To generate the radio frequency carrier and amplify it to an appro-
priate power level; the RF power output.
2. To modulate the carrier with the intelligence to the pre-determined
level; the modulation depth for AM, the deviation for FM or PM.
The process must introduce the minimum noise and distortion, and
prevent the modulation from exceeding the permitted level.
3. Radiate the minimum signals at frequencies outside the permitted
bandwidth. Out-of-band or spurious ...
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