We require our guys to use their card on the board even flying 2.4. We had a ham chanell section that now collects the 2.4 cards. We had to do this because we had no way of knowing if everyone with a transmitter on 72 had claimed their channel. Like today when I saw my first confurmed Kill. Two of our regulars, one flying a sail plane and the other with a nice electric biplane clashed. THe biplane was about a foot off the runway when the pilot started hollering that some one had turned on a transmitter on his frequency. In he went. It looked like a bad one, but after gathering the plane back it looked like a broken prop and maybe engine mount. Harsh words and appoligizies and it was settled.

By the way, I've seen three planes go in at our field due to radio problems that were on 2.4 Broken receiver antenna on two and transmitter antenna on another.

Myself, I've got to much invested in 72 equipment to change. The 2.4 doesn't offer me anything. If my frequency is taken, and that is very seldom, I just change receiver crystals and plug in another module on my transmitter.

Don.