Auto AGC RX - Odd behaviour

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iw7dmh
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Auto AGC RX - Odd behaviour

Postby iw7dmh » Sat Oct 22, 2022 4:36 pm

Hello,

I am having a odd behaviour when I enable the Auto AGC-RX1 function.
As you can see in the picture below, I have to set a very high value (26db) to keep the threshold few db over the noise floor level.
I don't know what I am missing but it seems I have inadvertently set a 20db offset somewhere.
Thank you in advance for any help.

Best 73'
Enzo, iw7dmh
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kc2rgw
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Re: Auto AGC RX - Odd behaviour

Postby kc2rgw » Sat Oct 22, 2022 10:05 pm

That’s normal. Simply set the value with your ears.
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w-u-2-o
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Re: Auto AGC RX - Odd behaviour

Postby w-u-2-o » Sun Oct 23, 2022 12:59 am

Yes, "normal", although perhaps not as intuitive as it could be. Richie changed the auto attenuate shift scaling so that it takes into account bin width and some other factors. It's a complex calculation.

Start with this post, https://community.apache-labs.com/viewtopic.php?f=9&t=4132&start=60#p19504, and then read down over the next dozen or so posts.
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iw7dmh
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Re: Auto AGC RX - Odd behaviour

Postby iw7dmh » Sun Oct 23, 2022 7:25 am

I am sorry for not having read the "Thetis 2.9.0" main thread, I should have searched better. The important thing it is the correct behaviour.
Actually I didn't said I installed the latest release (2.9.0.6 x64) because I was trying to fix a problem with TCI and SDC-Skimmer.
Anyway I'll read the full thread and if necessary I will open a new report.

Thank you very much for the hint
73 iw7dmh

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