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@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@comcast.net>
Subject: Re: [TowerTalk] Step-down balun 12.5-50ohm
To: "jimlux" <jimlux@earthlink.net>, <towertalk@contesting.com>
Message-ID: <DFFC789D36F34153B3B0B427DC8E6730@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@earthlink.net>
To: "Robert Thain" <g0hgw@yahoo.com>
Cc: <towertalk@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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