I just ordered a mylaps RC4 transponder to use at the local racetrack. I have used there house transponder the last few times and after each race you had to turn the crap in and ppl would forget and they would be dead....SO i ordered the RC4 and I know it plugs into the receiver. So i looked at the receiver and chan 1 and 2 are used so what one should i pug it into? and also if anyone uses one where did you mount yours? pics or whatever if you can help! thanks!