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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 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
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