[TenTec] OT: Question to the group

[rick@dj0ip.de]

Correct; was a typo.  
I meant the shack impedance or impedance seen by the matchbox.
Sorry, I'm on vacation with a tiny little tablet, typing in a hurry before
my XYL yells for me to QRT.

And the impedance at the shack end is exactly what I wrote.

Rick

-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Jim Brown
Sent: Monday, July 18, 2016 9:50 AM
To: tentec at contesting.com
Subject: Re: [TenTec] OT: Question to the group

On Mon,7/18/2016 12:25 AM, rick at dj0ip.de wrote:
> The feedpoint impedance is not only dependant on the impedance of the
antenna but also on the transformation of impedance due to the specific
length of feedline . . .  which varies from one band to another.

NO! The feedpoint impedance is AT THE FEEDPOINT -- that is, up in the air
where we connect the feedline!  And THAT is determined by the antenna, it's
surroundings (soil, mounting height, other objects) AND the common mode
effects of the feedline. But NOT the transformation of the Z by the line --
THAT'S the Z that the tramsitter sees, and that would be measured by a good
measurement device at the TX end of the coax.

73, Jim K9YC

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