[Elecraft] Field antenna tip

[n9tf at comcast.net]

Here ya go Wayne, a 160m loading coil!   http://www.slickpic.com/users/GeneGabry/albums/N9TFHamStationPhotos/?wallpaper#2743010 
  
This was from my one time 160m inverted "U". No matter how many times I tried shortening and lengthening the end, 2:1 was the best VSWR I could achieve. Until I added 21 turns around a "full" tube of caulk. Must have been the dielectric constant of the caulk material ;) 
  
73 Gene, N9TF 

----- Original Message -----

From: "Wayne Burdick" <n6kr at elecraft.com> 
To: "elecraft" <elecraft at mailman.qth.net> 
Cc: KX3 at yahoogroups.com 
Sent: Monday, July 25, 2016 2:45:53 PM 
Subject: [Elecraft] Field antenna tip 

Hi all, 

This weekend I was using the KX2 with a random length of wire tossed in a tree and another random length laid on the ground. Normally the ATU (KXAT2) can handle just about anything, but this particular combination of lengths wasn't working well on 40 m; SWR was still around 3:1 after matching. It probably looked like an end-fed half wave to the tuner. 

The wires were connected to a BNC-to-binding post adapter, suggesting a simple workaround. Rather than adjust the length of the wire by cutting or splicing, I simply reeled in a few feet of it and wrapped it around one of the binding posts, forming an inductor of perhaps several uH. 

The ATU was then able to match the antenna on 40 m, as well as the other bands (up through 10 m). 

73, 
Wayne 
N6KR 

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