A google for "w7zoi hycas" will show a well regarded AGC system.
It gives nearly 60dB of gain when there's no AGC action, about 40 dB more than the uBitx 12mhz IF has.
Lots of parts, but most are under a nickle.
Could be a $10 board if autostuffed with surface mount parts.
Henning mentions possible trouble due to filter delays if the AGC attenuator/gain-control is prior
to the the IF filter?and the AGC detector is after the the filter, something to be aware of:
? ??
/g/BITX20/message/32090?
Don's audio detect + FET rf attenuator is apparently not suffering any instability from this.
I have no idea what Bill is doing, but if he plans to have an AGC detector before the 12mhz filter
it will be interesting to see how he goes about making that work.
I'm still thinking a PIN diode bridge in one of the IF amps as the attenuator plus an audio based AGC detector.
Simple enough, and the uBitx doesn't need any more gain.
Jerry
