Repeater noise problem

[sukhjindersandhu <sukhjindersandhu@home.com>]

I'm wondering if any other repeater users have noticed a strange wavering
of pitch when nothing is looped, but the phones or main outs are cranked.
It's almost like a low oscillating tone. Again, i'm not playing anything
through repeater but the noise level is very high. Could it be software
or hardware related? I've tried moving repeater away from other gear, plus
all kinds of level changing and checking but the noise persists. Is there a
bypass option someone can suggest?

Sukhjinder