So, no one here has ever run into this before? Really??!
I found and tested a third radio... same problem.
To restate what the problem is: Micor mobile UHF T34...
when running in the ham band transmit low / receive high
they are spurring 910 kHz above the transmit freq. I don't
know what would happen if the frequencies were reversed.
443.750T 448.750R spur at 444.660
444.000T 449.000R spur at 444.910
It's not a power supply problem. The spur is generated low
level, not in the PA (it's somewhere before or at the
exciter mixer, Q305). It's not the offset oscillator. No
amount of tuning or de-tuning various stages has any affect
on the spur.
Paul N1BUG
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