Spotty Accuracy When Tracking Transmitter

Discuss KerberosSDR - 4x Coherent RTL-SDR
RJsaurus
Posts: 8
Joined: Sun Feb 14, 2021 4:16 pm

Re: Spotty Accuracy When Tracking Transmitter

Post by RJsaurus » Sat Apr 17, 2021 3:53 pm

For some reason I thought these antennas were for way lower frequencies. Thanks for the tip. Gonna run with that and with tracking on the amateur band rather than all the way down here.

After calibration I think I sometimes forget to change the decimation and FIR.

What does the spectrum graph look like when the signal is too strong?

And yes everything is helpful ^^

rtlsdrblog
Site Admin
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Re: Spotty Accuracy When Tracking Transmitter

Post by rtlsdrblog » Sun Apr 18, 2021 4:02 am

With dec and FIR filtering off, you should check the spectrum and see a single nice peak (assuming there are no other signals being received). If it's overloading from too much gain/signal, then you'll probably see multiple peaks with weird shapes.

Also one more thing I forgot to mention, don't forget to turn the TX OFF when you're calibrating. Even if the antennas are disccounted, you might get some leakage with a strong TX that close, which could corrupt the calibration.

RJsaurus
Posts: 8
Joined: Sun Feb 14, 2021 4:16 pm

Re: Spotty Accuracy When Tracking Transmitter

Post by RJsaurus » Tue Apr 20, 2021 7:04 pm

Ahhh thank you, yes we always see one peak. We do turn it off for calibrate.

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