# C.W. transmitters and keying

### Explanation of question 5

A VHF. transmitter, designed to operate on 144MHz, has an 8MHz crystal oscillator and a three-stage frequency multiplier. If the first and second stages are both frequency triplers, the third stage will be to multiply the frequency from

1. 36MHz to l44MHz
2. 48MHz to 144MHz
3. 72MHz to 144MHz
4. 288MHz to 144MHz

The answer is :- 3 First stage will multiply frequency from 8 MHz to 3 x 8 = 24 MHz. Second stage will multiply frequency from 24 MHz to 3 x 24 =72 MHz. The third stage must multiply the frequency from 72 MHz to 144 MHz, i.e. a frequency doubler.

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