[Elecraft] Balun at input or output of tuner

[Jim Brown]

On 12/13/2011 10:43 AM, Dean Straw wrote:
> I used a bifilar wound CM choke at the input of the ARRL high-powered tuner
> described in late editions of "The ARRL Antenna Book." It had 12 bifilar
> turns of #10 AWG Formvar wire on a 24-inch diameter OD Type 43 core.

Jerry said that Zo for this sort of wire and winding style was about 50 
ohms.  I wound some that way, and they acted like they were close to 50 
ohms (as observed by SWR measurements) when inserted between TX and tuner.

73, Jim K9YC