WiNRADiO G315 VHF/UHF Receiver
42
IF Gain Control
The AGC can be turned off using the AGC
Off
button. The
receiver gain must then be adjusted manually. This is done using
the
IF Gain
control.
Note that by setting an excessive gain, the receiver will overload
and the demodulated signal will be distorted, which can be very easily
observed in the real-time spectrum scope. On the other hand, if the gain is too
low, it will make the receiver appear “deaf”.
Manual
IF Gain
setting is very useful when hunting for
very weak signals buried in noise. The
IF Gain
control
is only enabled when the AGC is switched off.
The gain can be adjusted in three ways: by typing the
value directly in the edit box, by using the up and
down buttons, or by dragging up or down the centre
slider button.
RF Gain Control
The
Attenuator
, when enabled, makes it possible to reduce the receiver
sensitivity by 18 dB. The
Preamplifier
, when disabled, reduces front-end gain
by further 12 dB.
By attenuating the input signal and/or reducing the front-end
preamplifier gain, the sensitivity of the receiver is reduced to
avoid overloading by strong signals (e.g. from local broadcast
stations).
If you are experiencing overload problems, try to disable the
Preamplifier
first.
If sensitivity appears poor, please make sure that the attenuator is disabled
and the preamplifier is enabled.
