>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.
Urethane can be removed with paint stripper paste.
>-
>Would we call said properties, the coatings D factor..?
Urethane has an ok D-factor up to 14kW.
>-
>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.
>-
Varathane? works ok.
Rich, AG6K, 805-386-3734, www.vcnet.com/measures
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