# F.M., A.M. and S.S.B. transmitters

### Explanation of question 6

In phase modulation, the frequency deviation is a function of the

- i voltage of the modulating signal,
- ii frequency of the modulating signal

1. i and ii are both true
2. i is true but ii is false
3. i is false but ii is true
4. i and ii are both false

The answer is :- 1Frequency modulation and phase modulation are collectively known as angle modulation. A large proportion of f.m. transmitters are really phase-modulated, a system which is cleaner. The arrangement for phase modulation is: buffer - frequency oscillator - amplifier - multipliers

The phase modulator is basically a series L, C circuit, and frequency deviation is a function of both i and ii.

BACK

page (tq1806ex)
Some material Copyright John Bowyer G4KGS.
Click here for important Copyright information
Web Space provided by Hostroute.com Ltd
Contact details