User's Manual Part 1

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Receiver Pre-amplifier
Enables or disables RF preamplifier, this preamplifier provides and additional
receiver gain of 5dB. Generally the RF pre-amplifier is switched off when an
automatic mobile antenna is in use as these antenna have an inbuilt RF pre-amp.
Use the Scroll keys to select the setting required (example
shown “Enabled”):-
press the key