[Boatanchors] VFO Drift

[David Knepper]

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
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