From: [email protected] <[email protected]> on behalf of Floyd - K8AC <floydsense@...>
Sent: Monday, February 19, 2024 7:26 AM
To: [email protected] <[email protected]>
Subject: Re: [EFJohnson-Amateur-Radio] Enameled Wire Coils in Johnson Valiant

Back in the early 1970s, we had TVI problems when operating on 15 meters.? The third harmonic fell on TV channel 3 and most transmitters of the day radiated considerable energy on channel 3.? The Drake T4 transmitter was a terrible offender.? At that time, I acquired a Valiant, which had considerable attention paid to suppressing harmonic radiation.? The cabinet sealed well to the chassis and front panel and the coils you mention along with the bypass capacitors prevented radiation from any wires connected to the rear panel.? I believe there were even metal cans around the rear of the meters.? When I installed and tested the Valiant, there was ZERO interference on channel 3 and it remained my transmitter of choice for a long time.? I guess there's no pressing reason to keep the coils in place today, but I'd keep them anyway.

73, Floyd - K8AC

Former owner of Navigator, Ranger 1, Ranger 2, Valiant 1, Challenger.