[600MRG] More RX improvement

[Paul N1BUG FN55mf]

Thanks Brian.

I have forgotten so much during my three year break!

I believe I was running without AGC last time but I tried it on this new
receive setup last night and it did not seem to work well. It made an
absolute mess of every waterfall and I had the feeling decodes were
compromised. It didn't seem like WSJT-X was being overloaded but it must
have been. I will have to look into that further. For the moment I think
my customized fast AGC settings work best.

It is possible I will end up going back to the previous receivers if I
feel this isn't working well enough. But there are certain advantages to
the new setup so I will give it every chance first.

I have plenty of things making noise around me too!

73,

Paul, N1BUG



Paul, N1BUG FN55mf
Check out my website and YouTube channel
http://www.n1bug.com
https://www.youtube.com/@n1bug

On 12/14/2024 11:04 AM, Brian Pease wrote:
> With my K3S (transverter mode), using a beverage, I turn off both the
> preamp and the AGC, set to SSB BW, then back off the RF gain to set the
> USB audio level, otherwise the static crashes will overload WSJT-X. The
> software really wants to see wide bandwidth short duration static
> crashes in order to differentiate them from the much longer signal tones.
>
> That said, my reception is poor most of the time due to inverter
> harmonics every 120Hz from an industrial wind farm on a ridge 1 mile away.
>
>
> On 12/14/2024 6:48 AM, Paul N1BUG FN55mf wrote:
>> I swapped out receivers yesterday. It is difficult to pin an exact
>> number on it but I appear to have gained close to 10 dB S/N on weaker
>> signals! Oh, and all that RFI I used to have but wasn't seeing since my
>> return? It's still there. The receiver was just too deaf to see it.
>>
>> In all probability I am still a few dB off optimum. I need a bit more
>> preamp gain. It's coming soon.
>>
>> I think I can improve digital mode decoding slightly by adjusting AGC
>> settings. The hold and recovery times are too long and are unnecessarily
>> "punching holes" in the audio after a static crash.
>>
>> There are so many things to optimize... :-)
>>
>> 73,
>>
>> --
>> Paul, N1BUG FN55mf
>> Check out my website and YouTube channel
>> http://www.n1bug.com
>> https://www.youtube.com/@n1bug
>>
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