[TowerTalk] Step-down balun 12.5-50ohm

[Perry - K4PWO]

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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