[TowerTalk] Step-down balun 12.5-50ohm

W1JCW W1JCW at hotmail.com
Thu Aug 20 15:35:15 PDT 2009


He builds very high quality stuff, I have a few of his things..

Give him a call to discuss what you want, he takes all the time to ensure 
you get what you want.
He makes all items himself and winds his own.

73-
W1JCW
John

--------------------------------------------------
From: "W5CPT" <w5cpt at bellsouth.net>
Sent: Thursday, August 20, 2009 5:17 PM
To: "Robert Thain" <g0hgw at yahoo.com>; <towertalk at contesting.com>
Subject: Re: [TowerTalk] Step-down balun 12.5-50ohm

> Robert,
> If you are looking to have the balun built got to:
>
> http://www.balundesigns.com/servlet/StoreFront
>
> He can build anything you want reasonably.
>
> I have no pecuniary interest in the company, just a satisfied user.
>
> Clint - W5CPT
>
>  ----- Original Message ----- 
>  From: Robert Thain
>  To: towertalk at contesting.com
>  Sent: Thursday, August 20, 2009 5:14 PM
>  Subject: Re: [TowerTalk] Step-down balun 12.5-50ohm
>
>
>  Hi,
>  Yes exactly,
>
>  I'm looking for 50ohm unbalanced to 12.5ohm balanced.
>
>  Thanks
>  Robert G0HGW
>
>  (ps sorry I can't how to reply to a message)
>
>
>
>  Message: 11
>  Date: Thu, 20 Aug 2009 13:57:58 -0500
>  From: "Perry - K4PWO" <k4pwo at comcast.net>
>  Subject: Re: [TowerTalk] Step-down balun 12.5-50ohm
>  To: "jimlux" <jimlux at earthlink.net>, <towertalk at contesting.com>
>  Message-ID: <DFFC789D36F34153B3B0B427DC8E6730 at svr>
>  Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>  reply-type=original
>
>  Just flipping the balun might not work as the Hi-Z side is balanced and 
> the
>  Lo-Z side is unbalanced. Just the reverse of what he probably needs.
>
>  73 de Perry - K4PWO
>
>  ----- Original Message ----- 
>  From: "jimlux" <jimlux at earthlink.net>
>  To: "Robert Thain" <g0hgw at yahoo.com>
>  Cc: <towertalk at contesting.com>
>  Sent: Thursday, August 20, 2009 13:48 PM
>  Subject: Re: [TowerTalk] Step-down balun 12.5-50ohm
>
>
>  > Robert Thain wrote:
>  >> Hello,
>  >>
>  >> I'm looking to build a Step-down balun 12.5-50ohm ie input with 50ohm
>  >> coax and output to 12.5ohm wire.
>  >>
>  >> Can any one point me in the right direction for a plan. I know they 
> exist
>  >> I've seen them for sale.
>  >>
>  >> I have bought a 1:4 50ohm - 200ohm balun, but I think I've messed up,
>  >> its the "wrong way around".
>  >> I hope I can use it for parts.
>  >>
>  >> Thanks
>  >
>  > both of those are 2:1 turns ratio. You just need to flip it around. For
>  > your application, the coax (50 ohm side) goes to the winding with more
>  > turns.
>  > _______________________________
>
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