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I have a project on my bench to put together a UHF 4-receiver
diversity repeater based on a JPS DSP voter. In planning this I read
a lot of work by C. Y Lee about diversity. With two branches you
need the antennas separated vertically on the tower which means
lower elevation for one, but still better than just one branch. If
you want all on same level, like a rooftop or tower with cross arms,
he recommended three branches or more to avoid having two antennas
correlated (less effective) in two directions. I am going with four
antennas and the fourth will be horizontally polarized. All I need
is more time and money. I have one not both at the moment. What I am
hoping to do is get it built and run some drive testing to compare
talk back with 1, 2, 3 and 4 antennas. My idea is that with the cost
of deploying commercial sites, it may be more attractive to enhance
a single site cell.<br>
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<div class="moz-cite-prefix">On 3/30/2016 8:51 PM, Mike - W5JR
wrote:<br>
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<blockquote type="cite"><font color="#000000"><span
style="background-color: rgba(255, 255, 255, 0);">By the
way if you have a high site, lots of ERP, no reason not to
use voter for multiple antenna diversity co located on the
site. No back haul needed.</span></font></blockquote>
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This is a great/simple/effective idea. Don't know why we didn't
think about this sooner. And I work in an industry that thrives
on diversity reception. It will greatly help the swishing
handhelds. The 2m repeater actually has remote receivers but
need to implement a 2 chan voter for 440. And the 900. <br>
<br>
tnx
<div>Mike / W5JR</div>
<div>Alpharetta GA</div>
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Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
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