Ron AC7AC wrote:
I believe that's why the K2 uses a fixed-gain wide-dynamic range I.F.
preamplifier (Q22) ahead of the I.F. filter, and puts the variable gain
MC1350 (U12) after the filter where it's reasonably well protected from
off-frequency signals.
Geoff:
At least my Racal RA6790/GM labels the front panel control "IF Gain."
As a side note, I find the RA6790/GM to have the best ergometrics of any
receiver I've owned, although not the best AGC action.
Jack K8ZOA
Geoffrey Mackenzie-Kennedy wrote:
Ron AC7AC wrote:
Going waay back to
Geoff, GM4ESD wrote:
Digressing from the subject of audio output for a moment, having the "RF
Gain" control the gain of the IF amplifier only can lead to some
undesireable effects unless the IF amplifier design is done very carefully
using suitable devices. The problem is that the linearity of som
Ron AC7AC wrote:
Going waay back to when I was first building receivers, that RF gain
actually controlled the gain of the RF amplifier (preamplifier in modern
jargon) at the input to the receiver as well as the gain of the intermediate
frequency (i.f.) amplifiers ahead of the detector. Nowada
Dohn, N8EWY, asked:
Isn't the position of the AF gain (volume?) dependent on the position of the
RF gain knob? As I turn the "RF gain" knob clockwise, the AF gain (volume)
increases. So it seems that the position of the AF gain knob is variable
with respect to the RF gain.
Just to get another
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