I have a homade 40 meter rig used from an old CB I had laying around. is there any way to incorporate an TX line to engage the relay in my TEN TEC 425 amp? Do they make an RF (inline coax) sense to provide the keying voltage needed? Right now the rig is qrp at 2.9 measured peak watts. Would like to run it at 40 or so out of the amp.