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[TowerTalk] W2DU Balun's?

To: <towertalk@contesting.com>
Subject: [TowerTalk] W2DU Balun's?
From: k4oj@tampabay.rr.com (Jim White, K4OJ)
Date: Mon, 4 Feb 2002 21:09:50 -0800
is K6NA still in the balun biz - he also makes a really primo one, too...

think he calls himself

Aztec RF


k4oj


----- Original Message -----
From: "Rajiv Dewan, N2RD" <n2rd@arrl.net>
To: "Jim" <w7ry@earthlink.net>; "Rich Hallman - N7TR" <rich@n7tr.com>;
<towertalk@contesting.com>
Sent: Monday, February 04, 2002 3:53 PM
Subject: Re: [TowerTalk] W2DU Balun's?


>
> Indeed.  I have had very bad experiences with commercially available
> W2DU baluns for around $20 or so.  All kinds of problems ranging from
> broken solder connection inside the pvc tube, broken beads, to ferrite
> beads shorting the connector on the inside.  I use then primarily for
> wire antenna strung between trees and they have very limited life.  It
> really takes a beating on the wire antennas.  Impregnating them helps
> at the cost of limiting their ability to dissipate heat.
>
> There are good ones that are vaccuum impregnated.  F12 and CalAv labs
> have these.  I always wonder about heat stress on these at lower
> frequencies.  And, they are rather expensive - almost $50 each.
>
> I now build them myself using kits (about $10 or so) available from a
> number of sources.  Before sealing up the PVC tube, I fill them with
> self expanding foam (available in hardware stores for insulation
> purposes) that comes in aerosol cans.  I use a vaccuum cleaner to suck
> from the other end of the tube as I fill it to get it into all nooks
> and crannies.  The ones I built have been in use for over 3yrs,
> compared to fewer than 2 for some of the commercial ones I tried.
>
> Regards,
> Rajiv, N2RD
>
> ----- Original Message -----
> From: "Jim" <w7ry@earthlink.net>
> To: "Rich Hallman - N7TR" <rich@n7tr.com>; <towertalk@contesting.com>
> Sent: Sunday, February 03, 2002 10:16 PM
> Subject: Re: [TowerTalk] W2DU Balun's?
>
>
> >
> > Well made an W2DU CANNOT be used in the same sentence!
> >
> >
> > I have had MANY problems with them. The failure was the solder
> connections
> > on the lugs that connect the coax to the studs/eyes. The ends of the
> coax
> > did not have a good mechanical connection. (Remember your Heathkit
> > instructions ?) The center conductor was just stuck through the hole
> in the
> > lug and little bit of solder applied.
> >
> > No much fun when the balun is mounted on end of the boom on  your 2
> element
> > 40 meter beam....And you cannot reach it unless you take down your
> tribander
> > and the 40 meter beam.
> >
> > Better to make your own with a torroid core and some Teflon coax
> RG-142 or
> > RG-400 and an outdoor PVC electrical box.
> >
> > 73
> > Jim W7RY
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: Rich Hallman - N7TR <rich@n7tr.com>
> > To: <towertalk@contesting.com>
> > Sent: Sunday, February 03, 2002 13:52
> > Subject: [TowerTalk] W2DU Balun's?
> >
> >
> > |
> > | Who is commercially selling a well made version of the W2DU Choke
> Balun
> > for
> > | Dipoles?  Looking for a 160-10 Meter version.
> > |
> > | Thanks...
> > | Rich
> > |
> > | ******************************
> > | Rich Hallman - N7TR
> > | Reno, Nevada
> > | http://www.n7tr.com
> > |
> > | N7TR DX-Cluster Access:
> > | telnet://dxc.n7tr.com
> > |
> > |
> > |
> > |
> > |
> ______________________________________________________________________
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> >
> >
> >
> ______________________________________________________________________
> __
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> The
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> > Order online at http://store.eham.net.
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>
>
> ________________________________________________________________________
> Where do you get ICE bandpass filters & beverage matching boxes?  The
> same place that pays for the hosting of this list:  The eHam Store.
> Order online at http://store.eham.net.
> -----------------------------------------------------------------------
>
> -----
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>



________________________________________________________________________
Where do you get ICE bandpass filters & beverage matching boxes?  The
same place that pays for the hosting of this list:  The eHam Store.
Order online at http://store.eham.net.
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