# Transmitter interference

### Explanation of question 16

An HF transmitter is capable of transmitting in all the allocated bands from 80m to 10m. A suitable filter to connect between the transmitter and antenna would be a

1. 30MHz cut-off high-pass filter
2. 30MHz cut-off low-pass filter
3. 3MHz cut-off high-pass filter
4. 3MHz cut-off low-pass filter

The answer is :- 2 The two band extremes 80 m and 10 m are equivalent to the frequency extremes 3.5MHz and 29.7MHz. A low-pass filter of cut-off frequency 30MHz will suppress harmonic frequencies above 30MHz which may cause interference to other equipment.

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