DaveInDenver
Middle Income Semi-Redneck
The race support net was likely using a repeater but it's also not unusual that a relay might be needed from a race marshall, EMT or support who may be in a radio dead zone. So it's possible the .520 traffic was just that, someone relaying information between the net and someone in an important location. Doesn't answer why they wouldn't choose a different simplex because the national calling should be left open, though.
Kurt, those guys running race radios are under the FCC rules. The spectrum from 150 to 174MHz is coordinated, the FCC calls it PLMR (private land mobile radio). If they are running unlicensed then they are illegal. It's possible they are using the MURS assigned frequencies, which are 151.820, 151.880, 151.940, 154.570, 154.600. That's also a licensed (like CB, the rule is the license) service, though.
Are they running narrow band? That's also a requirement for VHF with the exception of the amateur bands. There is an itinerant use, too, but I'm not familiar with how that works and whether it needs to be licensed and/or coordinated. It's also possible they are renting radios and using pool business frequencies, meaning the owner of the radios has the license and rents them on an ad hoc basis.
Kurt, those guys running race radios are under the FCC rules. The spectrum from 150 to 174MHz is coordinated, the FCC calls it PLMR (private land mobile radio). If they are running unlicensed then they are illegal. It's possible they are using the MURS assigned frequencies, which are 151.820, 151.880, 151.940, 154.570, 154.600. That's also a licensed (like CB, the rule is the license) service, though.
Are they running narrow band? That's also a requirement for VHF with the exception of the amateur bands. There is an itinerant use, too, but I'm not familiar with how that works and whether it needs to be licensed and/or coordinated. It's also possible they are renting radios and using pool business frequencies, meaning the owner of the radios has the license and rents them on an ad hoc basis.
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