If you adjust those inductors in the band select oscillators be very
careful. It is easy to wear out the threads in the slugs and/or the coil
forms the slugs screw in. It is also easy break the adjusting tool slot in
the slugs.
Ken N6KB
On Fri, Jan 28, 2022 at 12:47 PM Jim Goudie <jagoudie@comcast.net> wrote:
> And thanks again, again!!
> Jim AF3Z
>
> Jim Goudie — jagoudie@comcast.net
> 610 Kraybill Church Rd
> Mount Joy, PA 17552
>
> > On Jan 28, 2022, at 1:55 PM, Peter Bertini <radioconnection@gmail.com>
> wrote:
> >
> > Further Notes: To access those crystal slug tuned adjustments you will
> need
> > to lift the aluminum cover. You can disconnect all of the cables for the
> > FM board, and any RF connectors. The exciter board also provides DC
> > regulated voltages and must remain connected. Be very careful when
> moving
> > the cover, allowing the RF driver transistor to hit ground will cause
> > component damage! Be sure to use Fig 4-16 and Fig 4-15 to ensure you are
> > using the right adjustment for the band in question! Be very careful NOT
> > to damage the delicate slugs in those coils! Note that on some bands the
> > same crystal is used for two bands: ie: Y2 is used for 80 and 20 meters.
> >
> > If you adjust the questionable crystal inductor and the problem returns
> > when the rig is back together and gets hot then there is a problem with
> the
> > related band crystal(s). My solution was to remount the two DC regulator
> > pass transistors that use the top cover as a heatsink to the rear apron,
> > and to cut a 1" wide slot on the cover between the FM and the LL Driver
> > board. That was a rather desperate move on my part on two Omni's, but
> they
> > are still working. I don't suggest you hack your rigs as I did.
> > _______________________________________________
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>
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