Do they make such a flag?

We use both a clip for 2.4 GHz and a specific frequency pin for 72 MHz. Even though the 2.4GHz systems don't have the same problems that the 72MHz ones do, we still want to know that the person on the fight line, or in the pits for that matter, has a radio that has been checked in, and knows whether or not someone else is on his/her frequency.

So, if the 2.4GHz folks have a pin or a flag, we know they're not on 72 MHz and vice versa.

CGr.