[R-390] the saga cont. pt 9

[rbethman]

  The "Twinax" connection was meant for something around 120 to 150 ohms 
for Z.

It really doesn't matter unless you have a way to alter the impedance of 
the signal generator!

These were originally aligned with the AN/URM-25(X) series of signal 
generators.  They came with a "dummy" antenna of 50Ohms Z.

If you perform the alignment with a 50 Ohm Z signal output, then you are 
going to be in a "better" position, since today's antenna systems are 
"normally" a feed impedance of 50 ohms.

Tweak and peak accordingly!

Forget the "twinax", and use the "C" connector next to it.  It was meant 
for 50 ohms Z.

Bob - N0DGN

On 9/20/2010 2:01 PM, ka9egw at britewerkz.com wrote:
> What fun...got my Amphenol 82-5628 BNC-to-Twinax adapter in the mail
> today...it doesn't seem to work very well; I get better results off the
> unbalanced input and the adapter whows some fraction of an ohm between pins
> and between either pin and ground.  Does anyone know if it has some sort of
> balun or the like in it, and if so, what's the Zo and freq range?
> 73, Brian KA9EGW