[TowerTalk] Step-down balun 12.5-50ohm

[Robert Thain]

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.
> _______________________________