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Re: [TowerTalk] Baluns/tutorial/notes.

To: "Dan Zimmerman N3OX" <>,, "towertalk" <>
Subject: Re: [TowerTalk] Baluns/tutorial/notes.
Date: Sat, 22 May 2010 16:37:59 +0000
List-post: <">>
So here's an interesting question. You see claims and disagreements about power 
handling ability. 

Of course, how much power gets dissipated depends a lot on the specific 
application. But, is there some sort of standard test condition that would be 

In the space biz we use "twice the voltage" or "operate into any load of any 
phase". Those aren't reasonable for hams. 

I was thinking you'd have some sort of nominal mismatch, representing the 
operating bw of the antenna. That would be a continuous power handling.  Then 
you'd have a open/short test for short duration. Like if your antenna broke off 
a piece( you'd see the high swr and unkey)
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-----Original Message-----
From: Dan Zimmerman N3OX <>
Date: Sat, 22 May 2010 12:13:17 
To: towertalk<>
Subject: Re: [TowerTalk] Baluns/tutorial/notes.

On Sat, May 22, 2010 at 11:45 AM, Jim Brown <>wrote:

> >These line isolator's appear to be just a bead balun..but with coax
> >connector's on both ends.
> I haven't opened any of them up, but probably yes. Some may be wound chokes
> too.
> I'm sure that W8JI has figured that out.

I've seen a picture of  the interior of one of the DX Engineering line
isolators, I guess in QST, and it was three chokes in series, each of which
was a multi-turn binocular-style (not truly binocular cores, but two big
beads side by side).


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