[RTTY] High power baluns

[Jim Martin - MM0BQI]

Hi Jerry
Make your own and save a fortune!
I have parallel dipoles for 80-10m.  The balun is about 9 turns of coax 
formed on a piece of 4 inch drain pipe.  This works a treat and if you are 
using RG8/ RG213 type coax there is no loss or problem running full power. 
The other option is to use a stack of ferrite rings along the coax, works 
just as well.  I have tried a few commercial types which got hot and died so 
I would not go down that route again!
Try this page for more information http://www.cebik.com/a10/ant47.html
73
Jim,  MM0BQI

----- Original Message ----- 
From: "Jerry Pixton" <jpixton at shentel.net>
To: <rtty at contesting.com>
Sent: Wednesday, February 15, 2006 12:42 PM
Subject: [RTTY] High power baluns


> All HP rtty users with dipoles, etc,
>
> I discovered the problem I was having on 80m during wpx where the SWR 
> would
> suddenly rise. I thought it was the snow shorting across the folded 
> dipole.
> But in the day light Monday, I see the "load/terminator" at the ends of 
> the
> folded dipoles is badly scorched. And I can see the SWR rise under heating
> from the linear's RF.
>
> So my question for you dipole users is -  What type of high power baluns
> (one to one, I suppose) are you using to make your dipoles?
>
> I have always liked the parallel dipole arrangement where I can get all 5
> bands between two end supports with the tower holding the middle.
>
> All the baluns I am seeing are rated "at full legal power" but then they
> are qualified as ssb/cw duty cycle only. And some go so far as to say "not
> for rtty".   So what baluns will take 1.5 kw rtty continuous service?
>
> New antennas are going to have to be built
>
> Jerry
> ------------------------------------------
> Dr. Jerry R. Pixton, PIXOS Designs LLC
> http://www.pixos.com/designs/RadioTuner/
> jpixton at shentel.net
> ------------------------------------------
>
>
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