Re: KPA-1500 ATU not working well

Posted by Bill K9YEQ on Jun 23, 2018; 12:13am
URL: http://elecraft.85.s1.nabble.com/KPA-1500-ATU-not-working-well-tp7642239p7642277.html

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: [hidden email] <[hidden email]> On Behalf Of John Oppenheimer
Sent: Friday, June 22, 2018 5:27 PM
To: [hidden email]
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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