[Boatanchors] VFO Drift

[J. Forster]

FWIW, the board material had likely absorbed water, changing its
dielectric constant, hence the frequency.

Best,

-John

=============

> I thought that I would pass this on for what it is worth.
>
> A friend of mine was utilizing the solid-state PTO board from a WRL Glaxy
> V,
> Mark II for his new homebrew transceiver project.
>
> Tony told me today that the problem was not the components mounted on the
> board but the board itself.  When he mounted the components on a new board
> made of plexiglass material, the drift problem went away.  It seems that
> the
> original board was the problem since it was made of some kind of phenolic
> material.  When he even blew on the board, the frequency would begin to
> take
> off.
>
> The new PTO drifts less than 200 cycles over a period of an hours and then
> settles down.
>
> Has anyone experienced a similar occurrence?
>
> That original material that WRL used for the PTO evidentally had lost its
> insulation properties.
>
> He thought sure that it was not a component failure since he had replaced
> everything on the old board.
>
> Thank you
>
>
> David Knepper, W3ST/W3CRA
> Publisher of the Collins Journal
> Secretary of the Collins Radio Association
> www.collinsra.com
> Join today
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