> -----Original Message-----
> From: [email protected] [mailto:towertalk-
> [email protected]] On Behalf Of Jim Brown
> Sent: Wednesday, March 31, 2010 1:21 PM
> To: Tower and HF antenna construction topics.
> Subject: Re: [TowerTalk] coax stubs /bandpass filter
>
> On Wed, 31 Mar 2010 10:17:13 -0400, Gary Schafer wrote:
>
> >It is not resonant at the
> >harmonic frequency and acts just as a low pass filter with a low source
> >impedance at the output of the amp at the harmonic frequency.
>
> As noted in my tutorial, that's true for some amps, but not for others.
> For
> MANY amps, the last output filter element is a series inductor, making
> it a
> relatively high impedance at the harmonic. For such an amp, the best
> place
> for the stub is very close to the amp. The tutorial includes a matrix
> listing
> many popular amps, thanks in part to feedback received when I asked
> about
> amps on this reflector several months ago.
>
> 73,
>
> Jim K9YC
As noted in my post; that is why I stated "with a pi network output".
73
Gary K4FMX
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