Posted by
Bob Naumann W5OV on
Jun 05, 2010; 11:26pm
URL: http://elecraft.85.s1.nabble.com/K2-ATU-and-43-ft-Vertical-tp5144100p5144223.html
As Don mentioned, the 2-part article in QST was written by AD5X and can also
be seen here:
http://www.ad5x.com/images/Articles/Match160.pdfI built one of these "matching networks" (it's not a tuner) for my 43'
vertical and it works very well on 160, 80 and up. The AD5X matching network
is a very clever design and makes tuning of this short radiator quite easy
as it offsets the huge capacitive reactance of these antennas and even
allows control of the relays right over your feedline. Very slick.
I have a Zero Five vertical and it is made very well, has been up about 3
years and still looks brand new. The only difference is that with the AD5X
matcher I can tune it on 160 and 80 now!
The feedline makes a huge difference primarily due to the loss that will
impact your performance with poor SWR. If you have a lossy feedline (like
RG8X like I used at first) the antenna will appear to match pretty easily.
If you switch (like I did to 1/2" hardline, with its much lower loss) you'll
see the impact of all of that capacitive reactance in making tuning of the
43' antenna very difficult especially on 160 and 80. In fact, I could not
match it at all on 160.
73,
Bob W5OV
-----Original Message-----
From:
[hidden email]
[mailto:
[hidden email]] On Behalf Of Paul Huff
Sent: Saturday, June 05, 2010 5:20 PM
To:
[hidden email]
Subject: [Elecraft] K2 ATU and 43-ft Vertical
Does anyone have any experience with trying to match one of these 43-ft
verticals, that are being offered by several manufacturers, using the K2s
internal ATU? Is it able to find a match on 80-meter CW? Are there any
particular brands of 43-ft verticals that you like or don't like? Most of
these
verticals that I have seen are in the mid to upper $300 range, except for
the
fiberglass one from S9 Antennas. Any opinions on that particular antenna?
Thanks in advance for any information offered.
73,
Paul - N8XMS
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