[Elecraft] Help Identify a Balun

[Charles Greene]

Jeff.

One sure way is to connect a 50 ohm dummy load across the screw terminals 
and measure the impedance with an antenna analyzer. 7MHz is a good 
frequency to use. If it is a1:1 balun the analyzer will read 50 ohms.  If 
it is a 4:1 balun, the analyzer will read about 12 ohms. Alternatively 
apply power with a transmitter through a SWR meter, and measure the SWR.

At 09:29 AM 3/25/2005, you wrote:
>Jeff:
>
>A dollar will get you $10 that it's a 4:1 BALANCED WIRE balun.


Sounds like a 1:1 bead balun around a coax interior.


>73,
>
>Tom   N0SS
>
>At 08:11 AM 3/25/05, you wrote:
>I typed the Model # incorrectly. It is UB-1. Wayne Burdick pointed me to a
>reference to a coaxial "Ultrabal". The one I have is not a coaxial balun. It
>is a tube 6.75 inches long and 1.25 inch in diameter. It has an SO-239 on
>one end, and screw terminals on the other end. If no one can identify this I
>can take it into work and x-ray it.
>
>Jeff Burns
>AD9T
>
>-----Original Message-----
>From: elecraft-bounces at mailman.qth.net
>[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jeff Burns
>Sent: Thursday, March 24, 2005 23:34 PM
>To: 'Elecraft List'
>Subject: [Elecraft] Help Identify a Balun
>
>I was given two baluns, but I have no information about them. They are
>marked Ultra-Bal 2000 Model UV-1. Can anyone tell me what kind of baluns
>these are?
>
>I plan to order the parts for a new horizontal loop antenna on Monday. I
>need a balun to transition from open line to coaxial cable. If the balun I
>have will work I can scratch a new one off my shopping list.
>
>Thanks for the help.
>
>Jeff Burns
>AD9T

73,  Chas,  W1CG