Date: Thu, 28 Jan 2016 14:11:21 +0000 (UTC)
From: Rod Greene <w7zrc@yahoo.com>
To: Arnie Pfingst <arnie123@hotmail.com>, "towertalk@contesting.com"
<towertalk@contesting.com>
Subject: Re: [TowerTalk] Klm 40m-1
Arnie,
I have one of the old KLM 40m-1 antennas and have used it for years. So far it
has served me well. They do not normally need a truss support. I don't know
what the wind specs are for your area of the country, but for the northwest
where I am located, no truss is needed, nor called for in the documentation.
I don't think the antenna is anything to "write home about" but it is a very
good antenna for a shortened 40. And it handles and turns easily on a tower. I
have no idea how it would compare to a CushCraft.
73, Rod/w7zrc
## My problem with the CC 40m ants..like their XM-240 is... they use like 68
turns of 12 ga magnet wire, wound butt tight on a 3/4 inch fiberglass form.
Loss in EACH coil is aprx 8.23 ohms. Q is like aprx 81. Any loading
scheme would be better than this..and easily fixable. 3/16 or 1/4 inch al
or cu tubing would be ideal.
## The LL rods used on the klm-40 could also be easily replaced with hb
tubing coils. Then you would have a loss of way under 1 ohm..and a Q of 750
–1300 on either the klm or the CC ant.
## a simple dacron truss would ensure minimal sag with any snow or ice load.
Just make sure any truss is high enough above the 40m ele.
Jim VE7RF
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