[Elecraft] 43' Vertical and the K2 tuner

[Kok Chen]

I don't have the L and C values for the K2 tuner, but if you want to  
see what impedances can be transformed from 50 ohms using the KAT100,  
you can take a look at these images:

http://homepage.mac.com/chen/Technical/Tuner/T3580.jpg
http://homepage.mac.com/chen/Technical/Tuner/T14080.jpg
http://homepage.mac.com/chen/Technical/Tuner/T28080.jpg

The green dots are for transceiver : ( series L : shunt C ) : antenna.

The blue dots are for transceiver : ( shunt C : series R ) : antenna.

The dots shown are the impedances that the antenna sees if the  
transceiver's output impedance is 50 ohms.  So, antenna impedances  
that the tuner will tune is just the conjugate of the points that you  
see on the charts (i.e., just flip the charts upside down).  As the  
file name indicates, they are charts for 3.58 MHz, 14.080 MHz and  
28.080 MHz (RTTY frequencies, naturally :-).

The application that generates the charts above was originally written  
to test a Smith Chart library that I wrote for Cocoa.  (The library  
was subsequently used in cocoaNEC and by K1GQ in his cocoaVNA program,  
an application for the TAPR/Ten-Tec VNA).

I'll be glad to make the program available to anyone running Mac OS X  
10.4 or newer.  You can run the application to generate plots for  
other frequencies.  The Xcode sources are also available in case you  
have a different set of L and C values (than used in the KAT100) that  
you want to try out.

73
Chen, W7AY