[Elecraft] 270 foot (ish) Doublet & K3 ATU

[Matt Zilmer]

As long as the balanced line isn't resonant, you should be OK.  I use
61 feet here (18.6m) and it works fine from 2.8 MHz up.  The doublet
is 150 feet, total length.  So far I haven't found a freq that the
K3's ATU cannot tune, and that includes many MARS channels outside and
between the U.S. Amateur bands.

73,
matt W6NIA

On Thu, 15 May 2014 20:22:39 +0100, you wrote:

>Hello,
>
>Does anyone use a 270 foot doublet with the K3 ATU?
>
>Is there a combination of feeder type/length and Balun type & coax 
>length that tunes OK on 160-10?
>
>I am currently thinking a 1:1 balun and 33 foot of 300 ohm feeder.
>
>Obviously the coax length should be short but too short may cause rfi 
>probs, but then I only run 100W.
>
>Iain G4SGX
>
>
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Matt Zilmer, W6NIA
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