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Postby glenncos » Sun Mar 03, 2019 6:15 pm

I think Im doing something wrong, Im receiving booming signals and s-meter reads 5/6, i receive mediocre signals and s-meter reads 5/8..and I scratch my head.

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Postby sdrplay » Mon Mar 18, 2019 7:12 am

The RSP IFAGC will always try to increase the signal level into the ADC without introducing overload by adjusting the IF gain. When you are looking at different signal levels, look at the gain value in the top right corner of the Main Window to see what the AGC is doing.

Best regards,


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Postby SDRnerd » Wed Mar 20, 2019 10:17 am

That is why I do not use automatic IF-agc. Mostly setting it on -40 dB manual since I started using SDRplay models. Also its the SNR that is most important. S-meters are just a indication, but offers little value to me. I mostly use a external variable attenuator with 5 dB steps up to 65 dB to avoid overdriving the agc. Also using auto IF-agc bounces the noise base level wich I do not like and you can almost not measure exact signal levels. Ok, it will "protect" the adc in some way, but it is not the ideal solution but its rather a lazy operator approach in my opinion.

Just my 2 cents

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Location: Heppen - Belgium


Postby ON5HB » Tue Mar 26, 2019 3:00 pm

We Ham Radio Amateurs call the S-meter a Fun-meter or Lie-detector, just depends if the reading is good or bad for you.
Don't think anything of it, it's just a reading that you can use to compare signals for yourself and nothing else.
Any reading you get has no meaning and also can't be compared to other, sadly many do do compare, but is useless.

It will only indicate if one signal is stronger then the other on your receiver, nothing more.
Also levels are different for different frequencies.

That is the reason the military has stopped using S-readings as many didn't see it for what it is and make too much out of it.

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Bas - ON5HB

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