It is pointing toward a hard radio issue isn't it?? Before throwing in the towel, double (double) check the cable pin outs are correct and you have continuity ( The manual shows only 3 active pins so there is no flow control)? 3 pins are needed only for coms, pins 2-3 (TX-RX) should be reversed and pin 5 (SG) should be pin to pin). Double check for? pins pushed in , bent pins in the rig and rs232 adapter. Double check for debris inside the plug and sockets (little bits of cut coax shield for example) shorting one of the pins to ground. 73 WJ1I
