[Elecraft] K3 - SWR Indication

[Steve Ellington]

Phil
I agree concerning the swr being the same anywhere on the line but that's 
not what I said. I said "you will get different readings".
Now I'm sure there's plenty of reasons why we get these different readings 
and it's likely due to the meter design but the fact remains.
One thing I've learned over the years. Any statement or comment made about 
antennas and feedlines will soon be refuted by another to prove it 
incorrect.
Now my Smith Chart tells me it's time to take my morning walk. 73
Steve Ellington
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "Phil & Debbie Salas" <dpsalas at tx.rr.com>
To: <elecraft at mailman.qth.net>
Sent: Monday, May 04, 2009 7:43 AM
Subject: Re: [Elecraft] K3 - SWR Indication


> "Take any SWR meter and insert it at different locations along the length 
> of
> the feeder
> and you will get different readings."
>
> Other than SWR reduction due to cable loss, the SWR meter should read the
> same SWR regardless of where it is on the coax.  Picture the constant SWR
> circles on a Smith Chart where the SWR stays constant as you change the
> length of the transmission line.  If you add feedline loss, the SWR circle
> will spiral in towards 1:1 as you continue to increase the feedline 
> length.
> However, the K3 and an external SWR meter are both electrically so close
> that they should read the same (assuming comparable quality and properly
> calibrated SWR meters).  I have the same issue in that my K3 SWR reading 
> is
> always better than the reading I get on my in-line Array Sollutions
> PowerMaster.  Not a big difference though.  My K3 may read 1:1 when the
> PowerMaster reads 1.5:1.  I haven't really worried about it since I'm
> comparing the K3's internal SWR meter to an external $400 meter - and the 
> K3
> is happy.
>
> Phil - AD5X
>
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