Thanks Ken,
I’ve done that… in a Heath HR-10. The warning is appreciated!
Jim
Jim Goudie — jagoudie@comcast.net
610 Kraybill Church Rd
Mount Joy, PA 17552
> On Jan 29, 2022, at 1:26 AM, Ken Brown <kenradiobrown@gmail.com> wrote:
>
> 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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