Got lots of loose beads in a drawer from a blown-up W2DU.
|
| Greg K9ZM
Me too!
A friend of mine blew one up on a 2 element 40 meter beam. Running 1000
watts.
73
Jim W7RY
*The problem is not the W2DU concept, but rather the
*construction technique set forth by the company building and selling the
*balun. Thanks.
*-Paul, W9AC
Hmmm....
----- Original Message -----
From: Greg Gobleman <k9zm@frontiernet.net>
To: <towertalk@contesting.com>
Sent: Sunday, February 03, 2002 14:52
Subject: Re: [TowerTalk] W2DU Balun's?
|
|
| > Interesting -- I'd assumed Rich was referring to the W2DU bead choke
type.
| > I know they have some reported deficiencies at low frequency due to
uneven
| > heat distribution along the string of beads, but hadn't considered using
a
| > toroid and some teflon coax instead. Has anyone measured the
performance
| > of such a choke balun at 160m? What core material would be appropriate?
| >
| > 73, Pete N4ZR
| >
| I know we discussed this before, but, I have built several of the W1JR
type
| baluns. I have 6 in various stages of construction. I was never
satisfied
| with the enclosure for dipoles. Didn't matter on a beam as it would be
| affixed. Just never have gotten back to them. A fellow asked me sometime
| ago about testing one. I emailed him back to see if he wanted one in an
| enclosure to test or just the core with the Teflon coax but I never heard
| from him again. I made two different types. One for 10 thru 20m possibly
| 40m and the other a bit lower for 80m. Didn't do one for 160. I could do
a
| picture or two on the web if I can find a free hosting site. I think my
| memory is clear on the details. Used Amidon cores and info from W2FMI's
| book to do these. Never observed any heating in the one I tested. But
| really didn't put it to the limit. I was just doing these for myself, not
| commercially. Was kind of fun and I ordered 6 cores just to make it
| worthwhile. I have to go down in a while, I snag the info off them. I'm
| not very scientific here, just a typical Joe ham.
|
| Oh yeah, lots of good baluns out there, but I have seen heating in the
W2DU
| and W2AU. Got lots of loose beads in a drawer from a blown-up W2DU.
|
| Greg K9ZM
|
|
|
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