[Elecraft] KX3 connection to doublet question

[Rick Bates]

It's ALWAYS a good idea to use a common mode choke (not a voltage balun).  In your case, like mine, it transitions window line to coax, but more importantly it helps keep the noise down and RF out of the shack. 

73,
Rick wa6nhc

Tiny iPhone 5 keypad, typos are inevitable

> On Apr 20, 2015, at 8:42 AM, stan levandowski <sjl219 at optonline.net> wrote:
> 
> For several years, I've been using my multiband non-resonant 94' doublet, fed with a short run of 450 ohm window line, to a remotely mounted SG234 autocoupler and then a 25 foot run of 50 ohm coax to my KX3.
> 
> Has been working with perfection; no complaints, except I cannot operate QRP below 3 watts because that's the minimum RF required for the autocoupler.
> 
> 
> Now, if I wanted to extend my 450 ohm line and connect it directly to the KX3 and use the KX3's internal tuner, would there be any benefit in a 1:1 isolation balun at the KX3?
> 
> 
> I can't think of any reason this would be necessary except as a transition from the window line to a convenient coax output to the KX3.
> 
> 
> What would the KX3 prefer??
> 
> 
> Thanks,
>  Stan WB2LQF
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