Topband: Coax Choke Balun

K4SAV RadioIR at charter.net
Wed Nov 11 20:07:05 PST 2009


K4SAV wrote: I'm just trying to be accurate in describing what happens 
when you use a coax choke.

Well I was TRYING to be accurate, but I missed the description of what 
happens at the 1/2 wavelength resonance point.  That's not a high 
impedance at the feedpoint like I said.  It's low, so an added 
inductance that moves the resonance closer to the operating frequency 
increases the current.  In that case the coax wound choke could possibly 
increase the current if the feedline length is a little less than 1/2 
wavelength, maybe close to 200 ft.

Jerry, K4SAV




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