Paul,
Have you tried using a different instrument to view this spur? Some
spectrum analyzers and service monitors create an artifact of the viewed
signal, due to some unintentional internal mixing. When three different
radios exhibit the same oddball symptom, I'd suspect my test equipment
or possibly the hookup arrangement.
73, Eric Lemmon WB6FLY
Paul Kelley wrote:
> 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 effect on the spur.
>
> Paul N1BUG
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