----- Original Message ----- From: "Bob Macklin" <macklinbob at msn.com> > If you want to connect an ARC-5 transmitter to a 50 or 75 ohm resonant > antenna you can just move rotary inductor to the minimum inductance. Need to also put about 75 pF in series with the antenna. The transmitter will then tune a 50 ohm antenna to near full output.