RE: Re: may have it wrong

Posted by Ron D'Eau Claire-2 on Jun 17, 2005; 4:02pm
URL: http://elecraft.85.s1.nabble.com/may-have-it-wrong-tp379460p379464.html

Jim N2EY wrote:

On 40 meters, the feedpoint impedance will look like a resistance of a few
ohms and a reactance of several hundred ohms or more. Will the matching
network
be able to handle that, and do it without undue loss?

----------------------------

The impedance at the center of a 33 foot doublet on 40 meters will be about
12-j850 ohms.  I would  expect the KX1's ATU to match that without problem.


However, Wayne pointed out off the reflector that I was making a rash
assumption: Mike did *not* say he had an ATU!

Without the ATU it's very important to provide a decent match to the KX1
output of course. That's why Wayne said to use a self-resonant 66 foot
dipole.

So Mike, if you didn't include the KXAT1 internal ATU or a T1 external ATU,
maybe this is the time to add one! It's not a requirement, but if you don't
use one you'll need to make sure to have a low SWR at the rig with any
antenna you use in order for it to work very well.

Ron AC7AC


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