But the feed line system is pretty sloppy when it comes to keeping water out
of the balun and feedline.
Elements are also flimsy. Using the 10M material would be much stronger and
it can all be modeled, including the clamps, by various programs.
I dont know how the element dimensions/spacing compare to the older 66DX
which had pretty poor F/B. Adding another element on the same 24' boom made
a big improvement, I stacked a pair decades ago using the YO program.
But Mother Nature destroyed the elements after a few years.
Carl
KM1H
----- Original Message -----
From: "Steven Katz" <stevek@jmr.com>
To: "r miles" <greenacres113@charter.net>; "6m" <50mhz@mailman.qth.net>;
"antennas" <antennas@mailman.qth.net>; "towertalk"
<towertalk@contesting.com>
Sent: Thursday, August 08, 2013 12:53 PM
Subject: Re: [50mhz] [TowerTalk] hairpin matches
Why not just convert it to a VB-66DX (Hy-Gain's model for 6L 6m beam, 24'
boom)?
It uses a "beta" match, which is a "T" match, plus a balun, and works very
well. Essentially the same thing Telrex used several decades ago.
Details are: http://www.hy-gain.com/pdffiles/VB-66DX.pdf
WB2WIK
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of r
miles
Sent: Thursday, August 08, 2013 9:42 AM
To: 6m; antennas; towertalk
Subject: [TowerTalk] hairpin matches
I recently acquired a 5 el HyGain 10m monobander on a 24' boom. The yagi
uses a hairpin match. The plan is to convert it to 6m. Either a WVO
special on 19' of boom or use the full 24'. Since it's already in place we
are considering using the hairpin. Obvoiusly shorter as the freq is
nearly double 10m. My friend W4HLR will be actually doing the
construction.
We would like to hear your experiences with HyGain hairpin matches on
monobanders. Or any monobander. Is there an advantage using a hairpin
rather than gamma or other methods. DX-Eng sells hairpins & say they are
better than gamma, etc.
We're hoping to end up with a heavy duty yagi as the boom & element
sizes of this yagi are bigger & heavier than most 6m yagis.
It will be for next seasons 6m Es. If there is one. Hi! Really was poor
this Summer in NW Tn.
Tnx K9IL
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