Hi, Jon,
first off are you sure the Omni D you’re working on has the 30 meter band? That
was an option. Ditto 17 and 24 meters.
I don’t remember if the presets are done with diode or resistors. I’ll have to
look.
mike, wb8vge
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> On Apr 30, 2021, at 6:07 AM, Jon Iza <jon.iza@gmail.com> wrote:
>
> Folks,
> I am fixing an Omni D and, after solving a problem with the MC14528 on
> the timebase board, now one of the presets does not work as expected.
> I get consistent measurements of the VFO frequency on 1.8, 3.5 and 7
> MHz. On 10 MHz the display shows 30.xxx and on the upper bands the
> display show 8 MHz less than the expected (06.xxx for 14, 10.xxx for
> 18, ... up to 21.5xx for 29.5 MHz). The preset voltages show up on
> the preset-amp board.
> Any hint on where to look? The presence of display multiplexing
> signals makes difficult to me to trace the problem.
> Thanks for your help.
> jon, ea2sn / ae2sn
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