Going out on a limb here a bit... If it does not look like a normal 'ground' type of audio hum... If your exciter on your tx'r is synthesized, it may be a digital ground issue of sorts if the clock from it is making noise on your audio lines. something to look for. let us know what you find if anything ...mike/kb8jnm On 9/19/2018 10:49 AM, lengriff@optimum.net wrote:
Recently, my repeater at 42690 began developing an audio ' hum ' . An Asterisk restart does not stop it. A reboot is required. It is NOT power supply related. I tried substitute supplies for the Pi and Repeater. The message log shows not related errors.
It is software related somehow.
[ short audio file attached ]
Len WB2HKK
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