If it were me, I'd mount the Celwave on top and use the Heliax on that antenna. The top antenna being your receive antenna.
The 1/4 wave antenna would be for transmit. I assume it has a ground plane kit (sounded like you were using a mobile antenna). Feed that with something other than 9913 or LMR-type cable. If you can't use Heliax, use some RG213. You'll need a side mount bracket and consider weatherproofing and hanging it upside down. Now, that all said, 40 feet is not a lot of tower real estate to try to get enough isolation. You may not be able to accomplish that, especially running 30 watts. You may need to drop your transmit power considerably to avoid desense. All you can do is try. But don't be surprised if it doesn't work. Chuck WB2EDV ----- Original Message ----- From: "agrimm0034" <[email protected]> To: <[email protected]> Sent: Saturday, June 27, 2009 5:01 PM Subject: [Repeater-Builder] Where to install my repeater antennas > This isn't the most difficult question to answer, and I figure it can be > answered relatively easily. I currently over the past few weeks > constructed a GMRS repeater for my neighbor hood to use. It is constructed > of 2 maxtrac radios one set at just 30 watts tx. I plan to use 2 antenna's > so no duplexer is needed with some good Heliax cable running at least to > the TX antenna. I have 40 ft of tower that I plan to mount the antennas > on. One antenna is a Celwave (RFS) 6db gain antenna. And the other is just > a plain 1/4 wave NMO style mount antenna. Which is the best way to install > these antennas on my repeater? Celwave on the transmit end and at the top, > or 1/4 wave on the Transmit and celwave on the receive? Also which antenna > should be mounted on top of the tower? > > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
