[Amps] Fw: High SWR = Baluns actually

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Sat, 25 Apr 2009 17:36:40 -0400,
"herzog at frontiernet.net@frontiernet.net" <herzog at frontiernet.net>
wrote:

>
>The other was where the output of said transmitter would arc in it's
>output tuned "tank" sections, due to self resonance of the unused coils.
>I designed a replacement without that problem, that also added a lo-pass
>filter for harmonics. We didn't think of where to get such a bandswitch
>that would short out all the un-used open coils, but my boss told me to
>tell them the whole story, and they found the bandswitch addition that
>shorted out the coils, and we swallowed my design.

REPLY:

FWIW - I had a similar unwanted resonance problem in the unused coils,
but mine was caused when the unused coils WERE shorted out. I rewired
it so they were no longer shorted out and the problem went away. 

73, Bill W6WRT