[Elecraft] KX-1/MP-1 SWR limits

[Bob Nielsen]

The $25 KD1JV "Tenna-Dipper" <http://www.4sqrp.com> is a lot smaller
than a MFJ-259 and works great for tuning the MP-1.  I took mine to
France along with my K2 last spring.  Airport security didn't say a
thing, although they ran the bag with the K2 through some sort of
detector.

Bob, N7XY

On Mon, Nov 22, 2004 at 05:37:13PM -0800, Fred Jensen wrote:
> My KX1 has 30m and the ATU.  Works way more than great, if there is such
> a term..  We're signed up for a trip thru the Canal in the spring
> (reason #1 for the KX1), and I have acquired what I think is a homebrew
> version of the MP-1 or sort of.  N6QYS loaned me his real MP-1, and it
> looks pretty much the same and works (electrically) the same.
> 
> I've been using my MFJ-259B to pre-tune the antenna (with the goal of
> having the inductor settings marked so I don't have to take the 259 and
> try to explain that at the security checkpoint in the airports!), and
> then count on the KX1 tuner to handle the rest.  So far, on 40m and 30m
> seem to come out OK.  On 20, with the pre-sets I've been using, the best
> I can get is about 3:1 according to the KX1 after the ATU relays quit.
> 
> Questions:
> 
> 1.  Any ideas on what is an "acceptable" (in terms of actually being
> able to work someone) SWR for the KX1?
> 
> 2.  As with all antennas, I can tune the antenna for a variety of
> resistances and reactances.  I've been shooting for an impedance
> magnitude of around 50 ohms.  Possibly some combination of R and X is
> more optimum?
> 
> It's getting a bit chilly here in N. Cal. to spend time on the deck
> using trial and error (MN folks get one, and only one, joke apiece
> regarding "chilly") and I was hoping for some accumulated knowlege that
> will save me from the cold.
> 
> 73,
> 
> Fred K6DGW
> Auburn CA CM98lw
> 
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-- 
Bob Nielsen, N7XY                          n7xy (at) n7xy.net
Bainbridge Island, WA                      http://www.n7xy.net