[Elecraft] Suggestions??

[Rich Arland]

Thanks Bob and all the others who responded.


I figured that the KX2 internal ATU and SWR/PWR meter was giving me the "match" between the 50 ohm of the rig and the QRP SWR/PWR meter and that I had a problem with the 40M EDZ which has been up for over 9 years.


I removed the QRP meter from the equation and the KX2 ATU gave me a 1.2-1 match on the EDZ, at which time I went out to the tower and checked the balun on the end of the 450 ohm window line. While it was hooked up correctly and there were no broken wires, when I looked at the feed point on the mast on the roof it looked like one of the feed line wires was either broken or otherwise hanging out in mid air. Now at least I have a probable cause for the strange RF readings.


Since it is pretty nice weather here in my area I am planning on shooting a line into one of the 100 ft trees on the edge of our property and string up an end fed wire of some non-resonant length and use this until I can get some local club members together and replace the entire 40M EDZ and hang it on the tower at about 60-65 ft! Oh, there will be a counterpoise on the end fed wire!


Has anyone on this group ever modeled a long, non-resonant end fed wire w/counterpoise that can give me some idea of how directional they are (or aren't)?  I need to get a copy of EL-NEC!


Vy 73 es gud DX!

Rich Arland   K7SZ
Bent Dipole Ranch, Dacula, GA
Author: "ARRL's Low Power Communications, the Art and Science of QRP" (all 4 editions)

Cogito ergo CQ (I think therefore, I HAM)
http://commobunker.blogspot.com/




________________________________
From: Bob McGraw K4TAX <rmcgraw at blomand.net>
Sent: Sunday, January 28, 2018 9:03 PM
To: Rich Arland
Subject: Re: [Elecraft] Suggestions??

The ATU in the KX2 does not change the SWR on the feedline.   So your
QRP SDR/PWR meter, which is after the KX2 ATU, is showing the SWR on the
feedline.   The KX2 is showing the SWR between the PA stage in the radio
and the input to the ATU.

As to 20M.  Likely your match is good with or without the ATU thus the
external meter is showing the SWR on the feedline.

Nothing wrong except you need to work on that 40M antenna and improve
the SWR to a respectable value.

73

Bob K4TAX


On 1/28/2018 6:31 PM, Rich Arland wrote:
> While attempting to get Z60A on 40M last night I ran into a problem that I never encountered before.
>
>
> My KX2 has the built in auto ATU. I took the output from the rig into a QRP SWR/PWR bridge and then into my 40M EDZ and hit the "ATU" on the rig. "Click, Buzz" and the rig came up with a 1.0-1 SWR reading. HOWEVER, my QRP bridge was pegged in reverse indicating that there was no match.
>
>
> Earlier I had tried this set up on my 20M Yagi and it worked great. The rig gave me 1.0-1 and the analog meters on the QRP bridge did the same.
>
>
> The only thing I can think of is the 40M EDZ is the problem. I am going to try removing the QRP bridge and see if that makes a difference.
>
>
> In the mean time, anyone have a guess as to what I am seeing on 40M??
>
>
>
> Vy 73 es gud DX!
>
> Rich Arland   K7SZ
> Bent Dipole Ranch, Dacula, GA
> Author: "ARRL's Low Power Communications, the Art and Science of QRP" (all 4 editions)
>
> Cogito ergo CQ (I think therefore, I HAM)
> http://commobunker.blogspot.com/
>
>
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