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what are the "Dither", "Random", and "PGA" options in the radio settings panel?
Posted: Tue Feb 07, 2023 5:12 am
by Jim S.
I don't see anything about them in the notes that come up with the "Options" button, and the "Help" button doesn't seem to do anything.
Re: what are the "Dither", "Random", and "PGA" options in the radio settings panel?
Posted: Tue Feb 07, 2023 7:29 am
by jdow
More info please. Which front end? Generically speaking dither is a means of artificially extending the dynamic range extension that comes with decimation. Random is another way of doing the same thing. I am (at the moment) drawing a blank on "PGA".
{^_^}
Re: what are the "Dither", "Random", and "PGA" options in the radio settings panel?
Posted: Tue Feb 07, 2023 11:41 pm
by Jim S.
Which front end? The one built in to SDR Console 3.2 -- although I've seen pics of the ExtIO that have at least "Rand" and "Dither".
De-selecting "PGA" seems to drop the noise floor about half an S-unit, but I don't know what it's actually *doing*.
Re: what are the "Dither", "Random", and "PGA" options in the radio settings panel?
Posted: Wed Feb 08, 2023 7:16 am
by jdow
AirSpy dongles, rtlsdr dongles, RSP1, etc etc. are front ends. There is no front end within SDRC. It uses the external front ends to get the digital data it works with.
{^_^}
Re: what are the "Dither", "Random", and "PGA" options in the radio settings panel?
Posted: Wed Feb 08, 2023 9:35 pm
by Jim S.
Since I posted in the RX-888 subforum, I had assumed it would be obvious that I was talking about the RX-888.
Re: what are the "Dither", "Random", and "PGA" options in the radio settings panel?
Posted: Thu Feb 09, 2023 7:03 am
by jdow
Good point. I beg for a little slack as I'm preoccupied with getting a largish lump in a breast diagnosed and dealt with. So I'm not nearly at my best just now.
{o.o}
Re: what are the "Dither", "Random", and "PGA" options in the radio settings panel?
Posted: Thu Feb 09, 2023 8:23 pm
by jdow
DuckDuckGo: rx888 mkii "pga"
Got "Programmable Gain Amplifier" - probably not needed unless you are using a really small loop antenna (1 or 2 foot diameter.)
{^_^}
Re: what are the "Dither", "Random", and "PGA" options in the radio settings panel?
Posted: Thu Feb 09, 2023 11:02 pm
by Max
Justin Peng comments in this thread about a "VGA" which maybe is the PGA?
https://groups.io/g/NextGenSDRs/topic/r ... 8/96674581
Max
Re: what are the "Dither", "Random", and "PGA" options in the radio settings panel?
Posted: Wed Feb 22, 2023 7:01 am
by fei666888
These three functions are set for the ADC LTC2208, you can check the LTC2208 specification for related descriptions
https://www.analog.com/media/en/technic ... 2208fc.pdf