RE: NEC-LIST: Bazooka balun verification.

I am not sure I totally understand your configuration, but you can try
measuring the input impedance of the balun when the output is:

a) Open circuited
b) Short circuited
c) Terminated with a 50-ohm resistor (non-inductive)

This should give you some insight as to how the thing is working (or not
working, whichever is the case).

George

P.S. If you get the same input impedance regardless of the termination of
the balun, then it isnt working!

Original Message:
-----------------
From: GEORGE VARGHESE rfengg_at_lycos.com
Date: Wed, 12 Mar 2003 18:22:56 +1100
To: nec-list_at_gweep.ca
Subject: NEC-LIST: Bazooka balun verification.

>
> Hi All,
> I need the Transmission line experts to pitch in with thier
expertise
> to my query..........
>
>
> I want to fabricate a transmission line choke with the Belden 9222 triax
> .The inner conductor and the inner shield layer of the 9222 will be used
> for TEM wave propagation of the signal picked up by a transducer while
the
> outer most shield and the inner shield form a bazooka balun ( a quarter
> wave length of line which is shorted at one end and open at the other).
> When these are assembled with coax connectors and convoluted tubing, the
> problem that I am facing is that, I dont have physical access to the
outer
> most shield layer as its not connected to any connector , and hence I am
> not able to verify the operation of the bazooka balun as there are no
> physical connections available to me where I can test after proper
> assembly.
> Do have any non destructive methodology by which I can verify the
> performance of this unique balun without any physical access to the
layers
> forming the quarter wave choke?
>
> regards,
> George.
>
>
>
>
>

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