[Elecraft] K2, KAT2 and displaced choke balun feed

[Brett gazdzinski]

I have been thinking of doing the same thing, but good for 
600 watts of AM carrier plus modulation.
I would wind the coils out of copper tubing, and make the coils
tapped with a switch, only the best roller inductors hold up
over time.
The coils would have a link input from the rig side.

 http://www.cebik.com/link/link.html


Sort of like the old Johnson matchboxes.

They also had a switch instead of a roller inductor, the roller
allows too wide a range, its sometimes hard to repeat
settings as there are to many variables.

I have a heathkit tuner now with the roller inductor, and its
a real pain, a switch for the band would be better, even though 
the match might be slightly off.

Brett
N2DTS




> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Ehrlich
> Sent: Thursday, September 06, 2007 6:05 PM
> To: Lamb, Dick & Judy; Roelof Bakker
> Cc: Elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K2, KAT2 and displaced choke balun feed
> 
> I had to design and build my own because I wanted to run up 
> to a KW through 
> it.  If I had to buy new matched roller inductors they alone 
> would cost over 
> 400 dollars.
> 
> I found most of what I needed in my junkbox or on Ebay but 
> even so the parts 
> and materials alone were well over 300 dollars ... and I laid 
> out and built 
> my own circuit board, bent my own aluminum, and made many component 
> compromises.   Any commercially built balanced autotuner for 
> a KW would be 
> *very* expensive.  Many hundreds of man-hours later for 
> construction and 
> software programming have finally got me what I wanted and I 
> am very happy 
> with it.  But I don't ever expect to see one on the market 
> that is easily 
> affordable for most hams.
> 
> Don K7FJ
> 
> -----------------------------------------
> > However, it would be so nice to have a wide-range balanced  
> autotuner.   I 
> > couldn't find one on the amateur market.
> 
> 
> >> Though this works for me at the moment, it should be nice 
> if  someone 
> >> (Elecraft?) could come up with a stand alone truely  
> balanced automatic 
> >> antenna tuner.
> >>
> >> 73,
> >> Roelof Bakker, pa0rdt
> >> Middelburg, Netherlands
> >> JO11tm
> 
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