On Tue, 14 Oct 2003 18:27:50 +0000 (UTC), "Will Reeve"
wrote:

Hi,

I have an interesting project! I am using a RF receiver device which has a
50 Ohm RF input. I want to use a PCB printed antenna on FR4 board, not
unusual you say. but I need to pot the whole PCB in resin to make it
waterproof. The receiver only needs to work when floating on water! Has
anyone any experience in PCB antenna who would be so kind to comment on the
effects, and possible actions to counter any effects, of the potting. The
resin is much like araldite.



Any thoughts much appreciated.



Will


Hi Will,

Look into conformal coating as an alternative. Or simply mix acetone
and RTV to create one and paint it on. To cut down on water losses,
it would do well to provide an air jacket around the antenna elements
that is roughly a tenth wavelength in diameter (and from the tips).

73's
Richard Clark, KB7QHC