On 24/6/20 11:02 am, Jim Brown wrote:
On 6/23/2020 4:53 PM, Adrian wrote:
An excessive strength FT8 signal is easy to remove with notch.
Yes, BUT -- the notch introduces phase shift, which can degrade
decoding. K1JT recommends running the IF wide and letting WSJT-X
separate signals.
Ok on that, My experience is that it allowed decode of my target RX., I
did use narrow notch.
I DO strongly differ with the advice in the WSJT-X manual for setting
levels. Instead, I recommend setting audio gains so that the green bar
indicating audio level as close as possible to the top without it
turning red on when strong signals are present. I find Slow AGC works
well for me, because both the strongest signals AND my local noise
vary widely.
Yes I do that all possible gain and AGC turned off on low band use, with
green as high as 80dB with no red seen , for good weak signal decode.
Using low width roofing/dsp filtering around the signal boosts it to
great extent, using width/shift to focus.
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