[Elecraft] KX3: LNRPrecision EndFedz EF-10/20/40KMII Antenna SWR tuning

[Fred Smith]

I have one also about all I can add is to cut very little off at a time till you get it where you want it. The antenna works FB with my KX3 without any tuner used after trimming.


73,
Fred/N0AZZ
K3 Ser # 6730--KX3 # 2573--K2/100 # 6470-KAT100
P3/SVGA--KPA500--KAT500--W2




-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ariel Jacala
Sent: Tuesday, July 09, 2013 5:12 AM
To: Esquer Dave
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KX3: LNRPrecision EndFedz EF-10/20/40KMII Antenna SWR tuning

Dave,

If you are primarily a CW op then you are not going to grt much better. If you.operate mostly. SSB them you may want to shorten it.  If you want to split the difference then you have shorten it less than if you were optimize it for phone.  LNR does not recommend using a tuner although i use one anyway.  I have one of those as well and used it on a trip to Belgium.  Since then i made my own matchbox with a bigger inductor to handle more power.  I use 45 feet of wire and i tune it for all bands from 80 to 10 using the KX3 tuner.  You will be happy with a Par antenna as well.  Just do not put more than 25 watts through it.  You will burn up the matchbox if you do.

Ariel NY4G

Sent from my iPhone

On Jul 9, 2013, at 12:52 AM, "Esquer Dave" <dave.esquer at gmail.com> wrote:

> Newbie KX3 owner ALERT
> LNR Precision EndFedz EF-10/20/40KMII Antenna SWR tuning help needed (kind, constructive, helpful discussions/words please)!
> 
>                    Measured SWR (2 measurements at 2 different times of the day)
> Mhz        At SO-239    after 26' coax    after 41' coax run    
> 7.0        1.35            1.1            1.0
> 7.125    4.0            2.5            1.5
> 7.3        10.0            6.0            2.0
> 
> 14.0        1.5            1.2            1.5
> 14.15    1.25            1.1            1.5
> 14.35    1.1            1.1            1.6
> 
> 28.0        1.8            1.7            1.6
> 28.3        2.0            1.8            1.7
> 29.0        3.5            2.5            3.0
> 29.7        3.9            4.0            4.2
> 
> My ideal shack location is with the 26' of coax, the 41' is secondary outside location (fair weather).
> 
> What should I do for the 40 and 10 meter wavelengths to tune? I think 
> I leave the 20 meter portion alone? Once the 20 meter is tuned, the 10 meter falls into place supposedly but … Why do my values vary so much? I sort of see a pattern. I want to physically tune the antenna and not rely on the internal Elecraft ATU. I want to maximize my QRP.
> 
> Inverted L configuration with 2/3 vertical and 1/3 horizontal.
> 
> Equipment:
> LNRPrecision EndFedz EF-10/20/40KMII Antenna Elecraft KX3, ATU 
> installed but disabled (not bypassed).
> LMR240UF for all coax
> MFJ870 Grandmaster SWR meter
> All frequencies tuned using FM option at 5 watts I don't have an 
> antenna analyzer, yet.
> 
> Just like in woodshop, measure twice, cut once! Again, NEWBIE advice much appreciated.
> 
> TIA,
> Dave, K6WDE
> 
> 
> 
> 
> 
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