• You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
  • The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

The linear already has the required relay inside. You just need to figure out the easiest way to close the connections on the RCA jack on the back of the amp that is marked KEY when you transmit. Some use a foot pedal switch or push button if the radio does not have a key line.