[aprssig] APRS buoy - transmit power and antenna?
bruninga at usna.edu
Tue Sep 11 08:45:12 CDT 2007
> I'd opt for maximum antenna efficiency and use a
> suitably matched halfwave whip. These are sold
> as a ground plane independant antenna or GPI.
Yep, that is what a J-pole is.
> > Assuming you're in the open ocean and only care
> > about hitting a satellite, is the J-pole going
> > to give you a suitable radiation pattern?
> > Or would a 1/4 wave be better?
There is no easy way to get the needed groundplane for a 1/4
wave. Whereas the Jpole slides up nicely inside a fully sealed
piece of PVC pipe.
> >>> Looks like about 9-10 miles for a bouy to a 30'
> >>> station...ignoring any ducting of course.
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