I have relay buffers available. These are used to isolate your transceiver's amplifier keying circuit from your linear amplifier. My units are powered by 12V DC and have RCA jacks for connecting your rig and amplifier to the unit. The output is capable of switching up to 125V at 10 amps. Pricing is $25 plus shipping via USPS Priority *Radio Cable not included. Ask for availability/pricing. Dimensions : 3" x 2" x 1"