[arm-allstar] 1KHz Whine

[Rick Wilson]

I had this issue and even a 60 Hz hum at times.  It went away when I switched from a wall wart on the pi to a 12 to 5 volt converter ran by the same power supply as the radio.

Here is an example: https://www.ebay.com/itm/DC-DC-Step-Down-Volt-Converter-12V-to-5V-3Amps-15-Watts-W-Micro-USB-Output/382162618702?epid=3005251096&hash=item58faaac94e:g:v70AAOSwY19akwJq <https://www.ebay.com/itm/DC-DC-Step-Down-Volt-Converter-12V-to-5V-3Amps-15-Watts-W-Micro-USB-Output/382162618702?epid=3005251096&hash=item58faaac94e:g:v70AAOSwY19akwJq>

Rick, wd5etd