Martinm
You can use the ATU menus to find out what value L and C and which
network configuration NT1 or NT2 was in use by the KX1's ATU and you can
see what the L network looks like in each case in the manual.
See http://del.icio.us/tag/EFHWA for more links on end-fed half-wave
antennas, from people who have field experience.
Leigh / WA5ZNU
On Mon, 12 Sep 2005 9:42 pm, Martin Gillen wrote:
Hi.
I started at 33.25ft vertical but I did leave a pair of 18.5ft
counterpoise wires running at about 2 feet above the ground connected
to the ground terminal.
I tuned up and ... 1.2:1 match on 20m!
I then proceeded to work KF6GC with 2W (almost 4000km)
in the middle of a K Index = 8 solar storm! So I know
the antenna worked well.
I modelled it in EZNEC and the impedance at the base
of that antenna should have been 970 + j 1700 ohms,
so I am surprised that the KXAT1 was able to match it.
Any comments? Was it because I left the counterpoises
connected that it worked so well? If I remove the
counterpoises in the NEC model the impedance increases
and becomes inductive to 1456 - j 1819 ohms.
Comments?
PS. I am only learning in this stuff so forgive any
overly simplistic analysis!!
Thanks,
Martin.
VA3SIE.
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