If anyone in the Southeast Georgia/Southern South Carolina has a SL-30, I would like to test my SL-30 in your airplane. We have checked everything involved in the antenna/grounding and all is OK. The problem is a air noise sound that goes away when you transmit(it transmits and receives OK). It cannot be eliminated by squelch. I am hoping it is a wiring issue with my Approach Systems Hub /cable. If it is the radio, I would like to test it in a known good installation prior to sending it off to be checked.