If you don't detect AGC till after the 12Mhz filter then you risk having
strong adjacent-channel signals controlling the AGC rather than the
signal you are interested in.
tim ab0wr
On Tue, 27 Mar 2018 20:03:46 -0500
"K9HZ" <bill@...> wrote:
Well¡.then again¡.
Detecting RF for AGC would have to happen after the 12mhz crystal
filter.
Not really¡ it can happen anywhere in the chain. The issue is the
bandwidth of: 1) the attenuator and 2) the detector used for the
AGC. With the right parts, anything is possible.
Would be tough to do on a uBitx without having that detector get
swamped by 12mhz BFO energy given the total lack of shielding.
I would certainly not argue with this¡specially with one that is wide
banded and sensitive.
Nobody has tried.
