RE: Reason for not upgrading to 2.4
I can understand that if you have 72 equipment and don't want to spend a lot of money to upgrade to 2.4. 72 equipment has worked reliably for many years.
That said, 2.4 solves a couple of serious problems that bother 72mhz.
1) The possibility of being shot down by your fellow flier.
2) Problems of locally generated noise. (RFI from ignition or whatever) I worked one whole season trying to eliminate ignition noise on one of my airplanes.
What I don't understand is why anyone would buy equipment on 72,50 or whatever. Saying that there are bugs to be worked yet is just showing lack of knowledge. The 2.4 equipment has been on the market for more than two years. The chips have been used for many years in telephones, Futaba has used it in industrial equipment for many years. The basic patent for the technique was issued before WW2. In fact Tesla propose such a transmission way back about 1910. Its been around before I was born and I am 82.