Kevin:
I'd like to add to the other fine responses that have suggested the
potential ill effects of tying two receiver inputs together without
isolation. To determine if this is actually the problem, try replacing the
second RX with a dummy load at the receiver end of the cable. If you still
have the same loss in range, then it's probably safe to consider some kind
of splitter that doesn't offer a lot of isolation, such as the odd-quarter
wave "Q" sections to match the sum of the two loads to the line at the T
connector. Otherwise, you're likely to need a bit more isolation that you
could get from a resistive splitter. Keep in mind though, that resistive
splitters seriously affect your systems noise figure and are only a good
idea after a preamp. In any case, the proper impedence match as opposed to
just the T may make a difference. If you do use a preamp before the
splitter, keep the gain of the preamp down to avoid overload
problems--particularly at a high profile site.
Chuck - N8DNX
On Mon, 6 Sep 2004, Kevin Berlen wrote:
> Over the weekend, I added a second UHF control receiver at one of the sites
> I take care of. The control RX antenna is up about 150ft. Previous to
> adding the new RX, I could easily access the first RX about 25 miles out.
> Since adding the second RX, I can only access either one about 12-15 miles
> out. I simply put a "tee" connector on the polyphaser and connected both
> lines to it. Not the best engineering practice, but I have gotten away with
> it before. Does anyone have an idea about how to properly match two
> receivers to one antenna? The receivers are located in different racks in
> different parts of the building. I know Motorola and GE had passive devices
> to do this job. Is there a way to build something "homebrew" to do this
> job? TIA, and 73,
>
> Kevin, K9HX
k
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