[TMC] GPR-90 Drift Fix?

[DA&MMC]

Gents, received this from Chris W7JPG. Please post any helpful
suggestions/responses to the list.
Denis

Chris Kepus wrote:

> Hi Dennis,
> I am getting ready to tackle the drift problem in my drifty GPR-90.
Since
> I understand this is not an uncommon problem, I suspect someone much
more
> savvy than I in electronic theory has solved this problem.  I went
through
> my limited files of TMC reflector comments on the GPR-90 and didn't
come up
> with much.  Do you know of anyone who has gone after this problem and
> solved it?
> Thank you,
> Chris Kepus
> W7JPG