[App_rpt-users] App_rpt-users Digest, Vol 85, Issue 58
rhyolite at leikhim.com
Wed Mar 30 21:11:56 EDT 2016
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.
On 3/30/2016 8:51 PM, Mike - W5JR wrote:
>> 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.
> 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.
> Mike / W5JR
> Alpharetta GA
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Leikhim and Associates
JLeikhim at Leikhim.com
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