ADC Overload Indicator?

HB9VQQ
Posts: 22
Joined: Tue Nov 05, 2024 9:46 am

ADC Overload Indicator?

#1

Unread post by HB9VQQ »

Is there an ADC overload indicator in SDRC ?

jdow
Posts: 960
Joined: Mon Aug 10, 2020 8:17 pm

Re: ADC Overload Indicator?

#2

Unread post by jdow »

I am not aware of one. And there is no good way to deduce it automatically with most ham price level A/D converters.

Of course, if you get into an overload condition it's usually very obvious from the spectrum display. As you change gain many signals will appear or disappear depending on the gain change direction. It's usually very dramatic.

{^_^}

Max
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Joined: Thu Aug 13, 2020 9:47 am

Re: ADC Overload Indicator?

#3

Unread post by Max »

HB9VQQ wrote: Thu Nov 28, 2024 1:27 pm Is there an ADC overload indicator in SDRC ?
AFAIK it depends what radio you are running, and therefore what data that radio reports to SDRC. Hermes Lite does have an overload indicator for both RX and TX. Some other radios maybe have the same?

73

Max

HB9VQQ
Posts: 22
Joined: Tue Nov 05, 2024 9:46 am

Re: ADC Overload Indicator?

#4

Unread post by HB9VQQ »

RX888

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KA1GJU
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Joined: Tue Aug 11, 2020 2:16 pm

Re: ADC Overload Indicator?

#5

Unread post by KA1GJU »

The SDR-iq has a red LED for overflow.
Not so sure about the SDR-ip, it's out in the repeater shed acting as a server.
73 Kriss KA1GJU Home of the KA1GJU Super Station SDRC Servers in NH, USA (FN42mw, FN43na, and FN42lt)

jdow
Posts: 960
Joined: Mon Aug 10, 2020 8:17 pm

Re: ADC Overload Indicator?

#6

Unread post by jdow »

Regardless. when you really go into overload the display very suddenly grows a whole lot of high level grass and spurious responses. Many ADCs will simply overflow the top bit of the number leaving you with a very low number that should actually have full scale added to it. When that happens the spurs happen.

{^_^}

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