[Elecraft] KPA-1500 ATU not working well
Bill Johnson
k9yeq at live.com
Fri Jun 22 20:13:24 EDT 2018
Can we change subject matter. Min is on the way and this is way to freakey!!!!!!!
73,
Bill
K9YEQ
https://wrj-tech.com/
-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of John Oppenheimer
Sent: Friday, June 22, 2018 5:27 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 ATU not working well
Here is a picture and some plot images:
http://www.kn5l.net/Elecraft/CP1/
Not super accurate 60 and 100 Ohm loads, but provides an insight of the coupler operation.
John KN5L
On 06/22/2018 04:15 PM, Wes Stewart wrote:
> I don't quite understand your methodology but there is one, apparently
> little known caveat with the use of the "Elecraft" coupler topology.
> AFAIK, this was first used by John Grebenkemper, KI6WX, in his Tandem
> Match, described in QST, January 1987.
>
> Paul Kiciak, N2PK, mentions in his paper, "An HF In-Line Return Loss
> And Power Meter", that this coupler suffers from poor input match at lower frequencies.
> So the SWR meter has high SWR!
>
> If the CP1 wasn't so expensive, I'd buy one just to measure it.
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