I recently purchased a new (for me) Dentron Clipperton L. My setup is as follows: FT-950 - Clipperton L - SWR meter - Remote Coax switch - HY-Tower. I also have a RLB-11 optical isolator between the radio and the Clipperton L for keying circuit. With the amp online (operating) 500 watts, when I un-key the radio the radio has very low receive (low reading on the radio S-meter and low audio). If I set the amp in standby and key the radio again the receive comes back to normal! I tune the internal tuner on the radio before I set the amp to operate and the SWR is good on both the radio and the antenna, (it is very flat across the 20 meter band). Could this be an issue with the TX/RX relay in the amp? Or would it be RF? the amp is on a shelf right above the FT-950, so they are about 6" apart. Any help would be greatly appreciated! This is my first amplifier.