Businesses like Racing Communications usually maintain the frequency license for the equipment they rent / lease.
Although there are some race venues where location-specific frequencies are licensed - due to the use of a base transmitter or repeater - most of the frequencies are often licensed for low-power (up-to-four watts) anywhere in the U.S.
The radio supplier can set the radios up to operate on any of these low-power, itinerent frequencies covered by their licenses. The number of frequencies a supplier can choose from sometimes exceeds 50 frequencies.
There are several ways to find out the specific frequency(s) being used:
- search the Internet previous research by a race track fan
- there are services that offer race frequency information for a fee / subscription
- use a frequency counter or scanner with a signal stalking feature at the track
If possible, also determine the PL / DPL tone in use ... if you have the ability to program that into your scanner. Other non-race radio users may also be using the same frequency(s) in the area of the race venue.
Some of the businesses providing two-way equipment to racing operations rent both analog and digital radios. If digital equiment is being used at the race venue, you will need a digital-capable scanner to hear the communications (unless it's a mode other than P25 ... then you're SOL).