BARRETT 2030 HF SSB TRANSCEIVER
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General Noise Suppression Tips
When searching for sources of noise, some of their characteristics can be helpful in
identification:-
Petrol engine ignition noise and contact breaker noise is a sharp staccato 'plop'
varying with engine speed. It is only with this class of noise that the impulse noise
limiter incorporated within some transceivers is effective
Noise from other sources generally has a more 'mushy' sound. That from the
alternator/generator may only be troublesome over a limited range of engine speed
and can also be influenced by the state of charge of the battery.
The noise from instrument regulators may depend on the battery voltage, the
reading of the instrument and the length of time the system has been switched on.
For this reason, the search for noise sources must be done thoroughly to prevent
noise from apparently reappearing after the installation has been completed.
Electric motors generate a 'whining' sound. Do not forget to check windscreen
wipers, electric fuel pumps, heater and air conditioning fans and other motors which
operate only on an intermittent basis.