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Repeater equipment having trouble RXing from members TXing to it...


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Posted

Hello all,

So, i have a bridgecom (BCR-40U) repeater with a "XLT Communications GMRS Mobile Duplexer (50 Watt)" from buytwowayradios.com. I am using around 35-45ft of LMR-400 cable and that is going to a "Harvest BC-200U" antenna. The site that all of this is setup at puts my antenna up around 200ft from the ground. I originally had an ed fong antenna (DBJ - UHF) at the site, but was finding out that we were getting horrible signal reception to/from the site. I ended up changing that out to the bc200u antenna and thought that would take care of the issue.

Doing radio checks we are only getting around a 5 mile radius from the repeater site. It should be covering much much more area than that. I can not for the life of me figure out why the repeater equipment is having such a bad issue. I have made sure that the repeater is aligned and the duplexer was tuned before it was shipped to me. this is bugging the crap out of me and the club members are not too happy that this new setup isn't working very well.

I had tested the setup with another antenna that was at the site, from another gmrs repeater that was there at the time (it was in the process of being taken down before mine came in) and was getting amazing results, that's why i ended up trading out the ed fong antenna to the bc200u one. It only made a slight difference, if any.

I called bridgecom to try and get some help, i did what they suggested, but to no avail.

Does anyone have any ideas that could help fix this situation?

I have had nothing but theories about why this is happening, but everything i have tried doing to fix the situation so far has made no change.

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Posted

I'd also be checking  your antenna feedline for continuity. What you described with the ability to transmit, but not receive, could potentially be caused if you have a VERY slight gap between the coax and the connector - effectively creating  your own iso-tee. That's why people ring out their connectors when they're done installing them. With your adapters on each end, that possibility becomes a bit more likely.

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Posted
12 hours ago, neosmith20 said:

I don't have an antenna analyzer, but i am doing some research and am hoping that i can do some-most of those tests with the nanovna.

Most VNA's do more than antenna analyzers. Though the manual https://nanovna.com/?page_id=64 isn't the most clear it appears to support setting cable velocity factor, and can detect short/open distance. You have to fiddle with stop frequency to adjust for "length".

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