WiNRADiO G69DDC User’s Guide
Gain
The
Gain tab
contains several controls to adjust various gain-related settings
of the receiver. The gain is a software parameter, and can be set separately
for each of the three virtual receivers.
AGC
The
Automatic Gain Control
(
AGC
) acts upon the digitally down-converted
and filtered demodulator passband, in order to keep the signal coming to the
demodulator at a constant level.
This is in fact functionally similar to AGC typically implemented in conventional
receivers, which also works on the IF signal prior to demodulation. The
difference is that in a conventional receiver, this is implemented in hardware,
while with the Artemis it is a software function.
The AGC has six speed settings:
Slow
,
Medium
,
Fast
,
User 1
,
User 2
and
User 3
. These make it possible to select the speed with which the AGC reacts.
Typically, the AGC would be in the medium position.
For most practical applications, the medium setting is recommended. Slow
setting would be used especially with Morse code (CW mode), while fast AGC
speed might be appropriate for very noisy signals, where noise bursts might
temporarily desensitize the receiver if a slower AGC was employed.
While the timing of the slow, medium or fast speed settings is fixed, the
remaining three settings are user-definable, making it possible to specify the
Attack
and
Decay
times:
60
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