[Elecraft] MP-1 Antenna KX-1 -- PW-1 [biig brother]

[Charles Mabbott]

I have the PW-1 which is the big brother to the MP-1.  I use a tuner with it
because by moving the coil I found this to be a very coarse adjustment.  I
did not want to spend all my time trying for the final tweak that was going
to nail the SWR I was looking for.  It will get you in the ball park but a
tuner of some sort is best for those fine adjustments IMHO.  

I just use an analyzer for roughing it in and the tuner allows me to move
around within the band.  I have written more details in the following.

See http://www.aa8vs.org/aa8vs/pw.htm

73  Chuck AA8VS



-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Howard W. Ashcraft
Sent: Tuesday, July 13, 2004 7:13 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] MP-1 Antenna KX-1

I have recently tried an MP-1 antenna with my KX-1.  I used the small tripod
mount and adjusted the antenna per the diagrams.  However, this led to a SWR
of 5.9.  By moving the coil, I was able to lower the SWR to 2.0--but no
lower.  And it was exceptionally sensitive to adjustment.  Moving the coil
by a single turn of wire would jump the SWR to 2.0.  In comparison, the KX-1
tunes on my Steppir IR vertical to no worse than 1.2 (with the autotuner
engaged), tunes reasonably well on a 40 meter dipole, and tunes well with
the random wire recommended by Elecraft.  Is my experience with the MP-1
similar to others?
 
Howard Ashcraft
W1WF
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