Re: Running a Repeater on a FM Broadcast Tower
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You might consider adding an isolator to your uHF system between the TX output and cavities. Chances are you are not going to encounter any issues. I have had numerous 2m and 440 repeaters on broadcast towers for several years without any issue. Recently I did run into a problem with a 2-meter machine, but the ERP of the radio stations was much higher. We were dealing with three FM's combined onto a single antenna with a combined ERP close to 100kW. I had to install a FM trap on the repeater feedline to reduce the amount of RF getting into the system from the FM stations. We have about 250ft vertical separation between the broadcast array and the repeater antenna.
Sounds like you are going to have a great system!
73,
Kevin, K9HX
On Thu, Mar 13, 2025 at 10:50?AM Chris Boone WB5ITT via <setxtelecom= [email protected]> wrote: No problem....Ive have repeaters on broadcast towers for decades...VHF, UHF ...TV and FM... you're good
Hello Group,
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I'm in the investigation stage of relocating a repeater to a FM broadcast tower site.??? I've been on several LMR towers and not had any issues but wanted to see if there is any best practices I could learn from on what equipment should be mandatory for being on a FM broadcast tower site.??? I have listed what I have so far.? Any additional equipment please
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1. The repeater will be on the UHF spectrum of the ham radio side.
2. It will be running a Kenwood NXR-1800K2 repeater with TXRX duplexers with a 100DB isolation between sides.
3.? Height will be between 350 to 400 ft
5. Cable is 1 5/8" hard line that was run but never used and capped off.
4. Antenna will be a commander technologies fiberglass antenna being side mounted on the tower with polyphaser lightening protection attached and grounded.
4a.? Jumpers will be 1/2 hardline between the antenna and 1 5/8" and the same going into the building.
5.? The radio station broadcast on 93.7 a with a ERP of 37,000 Watts and there antenna is at the 550ft mark.
6.? There only two 800Mhz commercial antenna's on the tower and a couple of Wifi provider dishes.?? I'll be above all of that equipment.
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Thanks!
Steven H.
N8RLW
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