[App_rpt-users] App_rpt-users Digest, Vol 85, Issue 58

Joe Leikhim 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.
> tnx
> Mike / W5JR
> Alpharetta GA
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Joe Leikhim

Leikhim and Associates

Communications Consultants

Oviedo, Florida

JLeikhim at Leikhim.com



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