Re: beeswax in an oscillator compartment

Andrew Mitz wrote:

"Larry Gagnon" <lagagnon@xxxxxxxxxxxxxxxx> wrote in message
news:pan.2004.12.15.21.21.27.858623@xxxxxxxxxxxxxxxxxxx


I gather the beeswax is to ensure rigid components to maintain
stability of the oscillator? Any other reasons for it? Is it
necessary for me to remelt the old wax and spread it around as
before, or can I get away with just reshielding the VCO?

Any suggestions appreciated.

Larry VE7EA


I have repaired a number of Epoxy Potted VCO modules by simply resoldering ALL of the PCB board connections !
The source of the problem is difference in the Coefficient of Expansion between the Epoxy potting compound and the PCB and the solder connections. Close inspection (under a microscope) will show that the joints in question have been fractured by repeated thermal cycling. Hand resoldering, rather than the original Wave-Soldering will produce a much stronger bond between the component leads and the PC board and reduce the problem.

Yukio YANO  VE5YS
.

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