Shift in Frequency Display

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Joined: Wed Aug 08, 2018 5:07 pm

Shift in Frequency Display

Post by AZDT » Wed Aug 08, 2018 5:13 pm

I’ve been using GQRX on my Mac connected to a RTL2832U SDR (using Realtek RTL in settings).

I listen on 2M to a local valley Net on 173.300.000 MHz. The other day I hooked everything up as usual but there was nothing on the Pandapter or Waterfall on that frequency. I scanned around for a strong Pandapter spike and shockingly, the local valley Net showed up on 148.300.400 MHz despite the fact they were still operating on the original freq. of 173.300.000 MHz.

Does anyone know what has happened to cause this to take place??? Has a setting somehow changed to cause this? Any help will be greatly appreciated…

Thanks in advance for any help in solving this issue.

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Re: Shift in Frequency Display

Post by rtlsdrblog » Fri Aug 10, 2018 2:30 am

How strong is the signal? If it's really strong is can overload the dongle and start showing up in other parts of the spectrum too. To solve it try turning down the gain, and definitely turn off Tuner AGC/RTL AGC.

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Re: Shift in Frequency Display

Post by tim_rtd » Fri Aug 10, 2018 9:13 pm

AZDT, perhaps things are a little backwards in your entry. 148.MHZ is 2m Band.
173 is outside the ham bands...

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