I noticed this at Field Day. The club was using a repeater with output
on 146.625. As soon as I turned on the K2 we got hash on that
frequency.
Any suggestions for tracking this down?

You must have an older KIO2 with the 16.289 MHz oscillator. The 9th harmonic is 146.60 MHz.

You can change the crystal to 18.432 MHz as used in the later KIO2s, or try clamping a chunk of ferrite around the cable at the K2 connector end.

73,

Lyle KK7P

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