|To:||"Bill" <email@example.com>, "'gary'" <firstname.lastname@example.org>,<email@example.com>|
|Subject:||RE: [TowerTalk] shorty forty|
|From:||Pete Smith <firstname.lastname@example.org>|
|Date:||Fri, 12 Nov 2004 08:30:40 -0500|
Well, this is a little categorical, I think, even though I would agree on
the XM-240 as the better choice. It's a lot "straighter-forward" than the
F12. The problem is that the EF-240X and EF-240S each consist of two
identical elements. The only difference between them is the position of
the shorting bars, and just setting them to cookbook dimensions doesn't
work well because there are too many possible physical variations (tension
of loading wires, attachment of shorting bars, etc.). That means that it
is entirely possible to wind up with no F/B or even a reverse situation
(been there, done that). You really need to tune these antennas in real
time using a signal source a few hundred feet away, adjusting the shorting
bars on the reflector to bring the F/B peak to the frequency where you want it.|
On the other hand, either the X or S versions are a lot lighter and easier to handle on the tower than the XM-240. My "S" works quite well, now that I have it tuned, and there's no reason the "X", once tuned, shouldn't be close to the XM-240 in performance.
I was just visiting a friend yesterday who is putting up a new XM-240. He had a lot to say about lousy quality control and errors in the instructions, but the basic antenna should be a fine performer, since it is electrically almost identical to the 40-2CD, though mechanically much superior, and cookbook dimensions do seem to work fine.
73, Pete N4ZR
At 08:23 AM 11/12/2004, Bill wrote:
This is an absolute no brainer. I have had both and you should run, not walk, to the Cushcraft. The EF240X is a not an option. I was warned about the EF240 and I didn't listen, so I feel duty bound to do the same for you.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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