# Transmitter interference

### Explanation of question 2

Frequency drift can be caused by

1. an unstable power supply
2. a varying component value in an oscillator circuit
3. poor mechanical ruggedness of an oscillator component
4. 1, 2 and 3

The answer is :- 4 Variation of power supply voltage, component values in the oscillator circuit and mechanical stability can all affect the oscillator frequency, and thus cause drift.

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