Re: Wide filter on QCX?
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Thanks Johan. I was thinking it was not as simple as just changing the menu frequencies and readjusting. I have 2 QCX's I've widened the filter on and while they do appear to
have a flatter response, imaging on strong signals is apparent. I did look at the ARRL article and that is the way to do it. Much more complicated though.
Another thing I've noticed is both widened QCX's exhibit a spur at 1400 Hz that was not there with the stock QCX filter. It appears to be audio not rf as it will not move with tuning.
It's not avbig issue but I'd like to clean it up.
I also have a QRPLabs RX with Polyphase network. I'll take a look at that. It may be a better solution.
On Tue, Aug 31, 2021 at 5:13 PM Johan Bodin <jbodin@...> wrote: