Hi George,
Thats exactly what I cant do becos I dont have physical access to the balun.If I have access to the balun I have no problems at all........Is there a way by which I can probe and find the high impedance in a circuit without actual connection of the balun to the VNA?
regards,
George
-- On Thu, 13 Mar 2003 23:49:14 ghagn_at_erols.com wrote: >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. >> >> >> >> >> > > >_____________________________________________________________ >Get 25MB, POP3, Spam Filtering with LYCOS MAIL PLUS for $19.95/year. >http://login.mail.lycos.com/brandPage.shtml?pageId=plus&ref=lmtplus >-- >The NEC-List mailing list <nec-list_at_gweep.ca> >http://www.gweep.ca/mailman/listinfo.cgi/nec-list > >-------------------------------------------------------------------- >mail2web - Check your email from the web at >http://mail2web.com/ . > > > _____________________________________________________________ Get 25MB, POP3, Spam Filtering with LYCOS MAIL PLUS for $19.95/year. http://login.mail.lycos.com/brandPage.shtml?pageId=plus&ref=lmtplus -- The NEC-List mailing list <nec-list_at_gweep.ca> http://www.gweep.ca/mailman/listinfo.cgi/nec-listReceived on Fri Mar 14 2003 - 06:02:11 EST
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