How can I determine the ratio of a balun?

[George Averill]

I purchased an old used balun at a hamfest.  It came with an instruction sheet for both the 1:1 and the 4:1 baluns.  All the markings are gone on the balun.  How can I tell which one it is?  The balun is sealed.

George
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[Vic Rosenthal]

Put a 50 ohm resistor or dummy load on one side and connect the other to an antenna
analyzer or radio with SWR bridge. If the SWR is close to 1:1 then it is a 1:1 balun. If
it is more like 4:1, then it is a 4:1 balun!

On 9/14/2012 6:14 PM, George Averill wrote:
> I purchased an old used balun at a hamfest.  It came with an instruction sheet for both the 1:1 and the 4:1 baluns.  All the markings are gone on the balun.  How can I tell which one it is?  The balun is sealed.
>
> George

--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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[Dr. William J. Schmidt, II]

And if it's 12 ohms...its 1:4 or backwards...


Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ

Owner - Operator
Big Signal Ranch
Staunton, Illinois

email:  [hidden email]


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Vic K2VCO
Sent: Friday, September 14, 2012 9:08 PM
To: [hidden email]
Subject: Re: [Elecraft] How can I determine the ratio of a balun?

Put a 50 ohm resistor or dummy load on one side and connect the other to an
antenna analyzer or radio with SWR bridge. If the SWR is close to 1:1 then
it is a 1:1 balun. If it is more like 4:1, then it is a 4:1 balun!

On 9/14/2012 6:14 PM, George Averill wrote:
> I purchased an old used balun at a hamfest.  It came with an instruction
sheet for both the 1:1 and the 4:1 baluns.  All the markings are gone on the
balun.  How can I tell which one it is?  The balun is sealed.
>
> George

--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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