Fred,
I've had pretty good luck on 20 with MP-1 bolted onto an neck-strapped
FT-817, but I have to hold onto the radio or use a counterpoise. I
suspect your trouble is that a KX1 and its attached wires are too small
to give a low feedpoint impedance. You will need a counterpoise (15 or
16
Thanks for all the responses -- I have quite a few things to work on.
To summarize the thread:
1. Use at least one ground radial. I have been using the radials that
come with the MP-1, but I notice that things change a bit (like more rx
noise, or Z changes) when I grab the case of the KX-1 or
Be very careful to wash the antenna, insulators and exposed coils and
connections with fresh water and dry them after each use. It only takes a
couple of hours to build up a layer of conductive salt crust on any exposed
surface, even when it's way above the water line. That bracing salt air
you
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
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,
Fred Jensen wrote:
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?
The ideal is a resistance of 50 ohms and reactance of zero.
Alan's Balun from WB6ZQZ will help low impedance antennas such as
electrically short verticals, and is an easy build. Placed at the
antenna base and hooked to coax with a BNC connector, it will reduce SWR
on the coax feed, and ease the matching job of the KXAT1 at the rig end
of the coax.
Folks,
Of course Lee is correct, but the range of the KXAT1 should also match a low
impedance - and short antennas do produce a low impedance even if the
reactance is close to zero.
Whether you need a 'unun' (unbalanced 'balun') at the antenna or not depends
a lot on the length of the coax
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