[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.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message delivered to k9yeq at live.com


More information about the Elecraft mailing list