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

### Explanation of question 24

Conventionally, in SSB transmission,

- i upper sideband would be used on the 20m band
- ii upper sideband would be used on the 40m band

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 :- 2 Conventionally, upper sideband is used for frequencies above 10 MHz and lower sideband for frequencies below 10 MHz. The 20 m band is the frequency range 14—14.35 MHz, therefore, use upper sideband. The 40 m band is the frequency range 7-7.1 MHz, therefore, use lower sideband.

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