[aprssig] What a diffeence an antenna makes
scott at opentrac.org
Mon Oct 31 13:15:23 CST 2005
> A 1/4 wave whip over a suitable ground-plane is a reasonable
Does the Pacific Ocean count as a ground plane? In marine installations, is
electrical ground connected to the hull?
What I'm thinking of would be a simple, cheap buoy that I can chuck
overboard while we're en route to San Clemente sometime. I like Bob's
suggestion of 4" PVC, and I've already used that successfully for a scuba
geocache. Might see if I can put an 8" cap on top, though, and mount some
solar panels on it. Even if that doesn't work out, alkaline batteries could
easily keep it going for months.
A whip antenna would definitely be easiest. Does anyone know what legal
requirements there might be for free-floating buoys? Like does it need a
flag or other markings?
Just to have it do something useful, I'll probably string a bunch of DS18S20
temperature sensors on a 1-wire bus with a fishing weight on the bottom.
I'm open to suggestions on what cable to use. Sensors could probably go in
adhesive-filled heat-shrink tubing inline with the cable.
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