I was wondering whether there is a way to determine which frequency serves as the repeater input when reviewing FCC license information for various agencies, particularly when multiple mobile frequencies are listed. This question specifically relates to VHF high-band frequencies. Any guidance would be appreciated.
Mobile Relay Question
- Thread starter Patoking
- Start date
Care to provide an example license? VHF-high splits vary
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- Oct 25, 2008
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Unlike UHF, there's no national standard for repeater offsets on VHF. If it's a simple system, you can try monitoring both the repeater output and the various mobile frequencies to see if you can hear the mobile. It's a bit easier with two radios.
A potentially better solution is to use the RR frequency database to see if your systems of interest are listed. Your can also ask for help/information here, but you'll want to be more specific about the systems of interest and your location.
If there are any "FX1" stations listed then that is a good indication that that frequency is the input. The FX1 designation is used for Control Stations. Not all repeater systems have control stations licensed but for those that do this is a good indications.
Also look at the amounts of radios licensed on the output and see if that matches the number on mobiles. Sometimes other mobile stations will have different amounts of units but the repeater input and output frequencies will usually have the same.
These are not always accurate so the only way to really tell is to monitor the reported mobile freqs to see if you can hear activity that matches the known repeater output. Of course this requires you to be in range. Like "ladn" said: be sure to check the RRDB, someone may have already figured it out.
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