[TowerTalk] Xm 240

[Dave Thompson]

I agree with Skip.  Use a decent SWR bridge and look at the SWR.  I suspect you will find the correct SWR.  Sure the coax could be bad but if its new from a dealer that should not be the case.  I have a high powered AM station 3 miles south of me and during  the day and this messes up readings on my 259B.
I have an older Cushcraft 2 el 40 meter beam which I rebuilt in 2017 with parts from MFJ version of Cushcraft.  The rep there said they have parts for all of the beams they sell.  I did find the T2X clamps were too light and used the old heavy clamps. after cleaning them up.


My rebuilt beam works as it should with 1.2 swr at 7150 (mid band setting) and SWR is 2.1 at 7005 and 1.8 at 7298.  I worked China on 40 SSB during the CQ WPX DX contests when many stateside stations were calling.  He was working many West Coast stations and I was the only W4 to work him at that time.  Took 3 calls to do the trick.  I worked Nauru Island during the Oceania DX SSB in 2021 and running 100 watts he told me I dad a big signal and loudest W4 he worked all day, 

73 Dave K4JRB

-----Original Message-----
From: kj6y (null) <kj6y at aol.com>
Sent: Nov 27, 2022 10:07 AM
To: BRUCE FORD <ks9u at aol.com>
Cc: <towertalk at contesting.com>
Subject: Re: [TowerTalk] Xm 240

Are you close to a strong RF field? I’v seen where interference can give false readings on the MFJ analyzers. Have you tried it directly to your radio and checked it? How high up is the antenna?

Skip, KJ6Y
818-522-5421
Communications Service Co
Sent from my IPad

On Nov 27, 2022, at 07:00, BRUCE FORD via TowerTalk wrote:

I put a new xm240 together (after a number of parts issues) and when testing it with a mfj 259 it is resident at 2:7 to 1 at 5926.0 shows 10:1 anywhere else tried 2 baluns and feed lines. Could this be a 259 issue although it is a newer one (to replace my very old one) .Has anyone had trouble with the traps/loading coils they use? First new antenna I have built in 40+ years and it does not work, very frustrating as this is all just slide together and measure. Any thoughts would be helpful
Thanks
Bruce K9RO


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