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URI: radio tune rxnoise fails

This page has been moved to the wiki here.

Please use the wiki, as this information here is out of date.

Ensure you have enough audio output from the receiver. Check with a AC voltmeter or scope. You need to have at least 100mV peak of audio for the rxnoise command to complete successfully.

Some radios do not produce enough high frequency noise (above 3kHz) to drive the noise detection DSP. In this case switching to simple usb is recommended.