There is one local UHF group that has a back-to-back 6m repeater
just for range extension. The Scom 7330 makes the
parallel/separate link on/off mode real easy (and for up to 3 ports).
At 02:10 AM 09/02/10, you wrote:
Gordon, something worth trying might be low-band.
About 20 years ago, I lived in an area where hams did course
communications for rally events in very mountainous terrain. I
remember experimenting one night about 2am with my partner at the
other end of a heavily wooded course, about 12 miles end-to-end.
444 MHz simplex, 5 watts, colinear mobile whip - no copy.
146 MHz simplex, 5 watts, 5/8-wave mobile whip - no copy, but would
barely break the carrier squelch.
29.6 MHz simplex, 4 watts, FM CB conversion, 1.3m helically-wound
mobile whip - full quieting and S9+.
Antennas might be a bit of a trick for portables on 10m, and a
repeater might have to be crossband, but worth a shot.
73,
Paul, AE4KR
----- Original Message -----
From: <mailto:[email protected]>Gordon Cooper
To: <mailto:[email protected]>[email protected]
Sent: Thursday, September 02, 2010 1:51 AM
Subject: Re: [Repeater-Builder] Re: Circular polarization for VHF repeaters?
Our repeater runs 5 watts output, needs to run three or four days off a
gelcell, and most importantly has to fit into a backpack to be carried
to a convenient hilltop. Fortunately, the split is 3 MHz so that the
duplexer is of a reasonable size.
The problem is getting reasonable coverage. Sure the search areas are
fairly small but usually encompass several ridges and deep valleys. We
use vertical polarisation with a 5/8 whip on the repeater and the search
teams have flexible dipoles that fit into their backpacks. Sharp ridges
and steep slopes contribute to coverage problems. Would circular
polarization help?? I think not.
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