# Transmitter interference

### Explanation of question 7

Harmonic radiation may be the outcome of

1. using a low-pass filter
2. using an antenna of incorrect polarisation
3. overdriving a power amplifier stage
4. insufficient modulation

The answer is :- 3 Spurious emission is the transmission of a signal on a frequency other than the one selected. It could be a harmonic developed in the power amplifier or radiation from an earlier stage, such as a frequency multiplier.

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