# Transmitter interference

### Explanation of question 17

Fig. 24.1 represents the layout of an HF transmitting station. X, Y and Z will represent respectively the

1. low-pass filter, antenna tuning unit, V.S.W.R. meter
2. antenna tuning unit, V.S.W.R. meter, low-pass filter
3. V.S.W.R. meter, low-pass filter, antenna tuning unit
4. antenna tuning unit, low-pass filter, V.S.W.R. meter

The answer is :- 3 The antenna tuning unit will be the last instrument before connection to the antenna feeder. The V.S.W.R. meter will be before this to indicate the effect of adjustment to the tuning unit. The low-pass filter is positioned between the V.S.W.R. meter and antenna unit so that the filter can suppress any harmonics generated by the circuitry of the V.S.W.R. meter. The correct sequence is therefore the transmitter followed by the V.S.W.R. meter, the low-pass filter, and then the antenna tuning unit.

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