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Mountain top tower - 2 UHF repeaters

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JLFH

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I run a WISP and I have a 30 meter tower that is about 800 meter above sea level, 2 clients are asking me to do UHF repeater service from that tower, one of them wants city and rural coverage (360 degree from the tower), and the other about 60 degrees wide to the south of the tower.

Client1.
- Kenwood TKRD-810 repeater DMR
- SYS-4533-2P Epcom Duplexer 463-468
- DB411-B antenna
- LMR400 cable

Client 2.
- Icom FR6000 repeater NXDN
- SYS-4533-2P Epcom Duplexer 443 - 448
- MAXRAD BMOY4405 antenna
- LMR400 cable

Tower.png

What should I put extra attention to?

Antenna suggested separation
Other device needed

Any comment is greatly aprreciated.
 
prcguy

prcguy

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You cannot use those duplexers at a mulit radio site. They are notch only and don't really have any band pass to prevent co site repeaters from causing interference. You need good quality band pass/band reject duplexers on both repeaters and any future repeaters you add to the site. If you were only installing one repeater and its low power and there is no other UHF radios at that site, then you might get away with the original model duplexer you mention.

Do not use LMR type cable on any full duplex system, its dissimilar metal construction can cause Intermodulation products that will raise the receiver noise flor and reduce range. No LMR cable anywhere in the system, not in the jumper cables to the duplexer or to the antenna. Use Heliax type cable to the antenna and good double shield jumpers from the repeater to the duplexer and other items in the RF path like RG-214, RG-142 or RG-400 cables.

If you run two repeaters you will need an isolator on each transmitter. If you only have one repeater then you can go cheap and not use an isolator.

The DB-411 is a good antenna but I think its directional for 9dB gain and you have to arrange the dipoles all around the mast for 360 deg coverage and the gain drops to about 6dB. Still a good antenna.
 
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JLFH

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Is the Q3220-E duplexer and LDF2-50 ANDREW / COMMSCOPE cable enough for each repeater?
 
prcguy

prcguy

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For a short run of coax to the antenna up to maybe 40ft I would use LDF4-50 at the minimum. If the run exceeds 50ft I would go with LDF5-50 and if it exceeds 100ft go to the next size up.

That Sinclair duplexer is very good and there are many others just as good. If you shop on Ebay you can get similar duplexers in the $250 to $400 range.


JLFH said:
Is the Q3220-E duplexer and LDF2-50 ANDREW / COMMSCOPE cable enough for each repeater?
Click to expand...
 
K4EET

K4EET

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JLFH said:
Syscom léase the 443-448 freq, I don't know about the other
Click to expand...
JLFH said:
IFT asign frequencies
Click to expand...
Apparently the IFT or their subcontractor is coordinating frequencies for your geographic area. Then what remains are the intermodulation (IM) and interference studies for the site itself. Here is a PDF formatted document that discusses that task. The three page document concerns 800 MHz sites but the studies are relevant for any frequency used at a radio site.


Use the Google search engine to search for "Intermodulation Study" and plenty of websites will appear with software to perform the task, additional information on IM/Interference Studies, etc.

Hope that helps...
 
J

JLFH

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prcguy said:
For a short run of coax to the antenna up to maybe 40ft I would use LDF4-50 at the minimum. If the run exceeds 50ft I would go with LDF5-50 and if it exceeds 100ft go to the next size up.

That Sinclair duplexer is very good and there are many others just as good. If you shop on Ebay you can get similar duplexers in the $250 to $400 range.
Click to expand...

I look for the cable in my supplier webpage and that cable is mark as obsolete, it recommends AVA5-50-E1 or AVA5-50-E1 , what's the diference between them?
 
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