Probably the color oscillator from a nearby TV set -- 3579.8 kHz, plus/minus either some calibration error if you're in CW mode, or the offset you've selected for SSB/PSK.
73, Jim K9YC --Original Message Text--- From: Gary Nichols Date: Tue, 11 Nov 2008 10:37:37 -0400 I notice a birdie at 3580.61 and wondered if this is normal or just my K3 needing something adjusted&de gary, kd9sv
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