Hi Rich,
-
I'm always afraid to coat conductors in RF applications I
spent a lot of time building a 6 meter antenna, of
which I coated with clear polyurethane after completion
and testing.
The coating had some poor electrical properties
which made the antenna unusable until I removed
most of it with solvent (not an easy task). A lot of
wasted time.
-
Would we call said properties, the coatings D factor..?
-
I guess the only way I'd seal anything would be to
first do the homework and find coatings which are
known to be "passive" to RF, at least through the
VHF Low region in the example amplifier.
-
One might ask some of the PCB mfgrs what
sealer they use as I often see coated boards in
high end equipment. Thanks for your idea, it
might be worth tossing out a list of known good
coatings by brand/type/name from amps members.
-
cheers
skipp
-
--------- Forwarded message ----------
From: 2 <2@vc.net>
>-
>The Italian made amp was a 4cx3000 layout, pretty
>well made but no power supply shown. The Italian
>builder (ham) was nice enough to talk with us
>about it and show Dave and I pictures of his
>multi band mobile operation. My only problem
>with the display amplifier was the unplated
>copper tank coils which had already started to
>turn dark.
? clean Cu with fine steel-wool, coat with polyurethane
? varnish and it will look better
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