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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