Some clubs are ignoring using pins with 2.4 gHz. When the 2.4 people bring out an old radio they are used to just flipping the transmitter on without frequency checking. We have seen a few planes shot down this way last year. We try to require pin use for 2.4 and 72, but the 2.4 people think it is a hassle..... I am building two new planes using 72 mHz, but be aware, it could be more dangerous than before.....no worry with 2.4. Airtronics is coming out with a 5 channel 2.4 for $125 so cost is not an issue....

bob