Anyone tried this? I can't seem to get the PTT to work using serial port. When in the manual position PTT is on all of the time. Thanks Carl W2SGX Semper Fi (former active duty Jar-head) Cpl USMC 1966 - 1972 RVN 6/67 - 7/69 "For those who fought for it, freedom has a flavor the protected will never know" Unknown Marine, Khe Sahn, Viet Nam 73 De W2SGX .-- ..--- ... --. -..- FN12um