[AMPS] Re: The Worldwide, No Holds Barred, SWR Quiz.

[Jon Ogden]

measures wrote:

>€  I'm trying, I'm trying.  .  I thought I recalled reading that you 
>supported the theory that the placement of the SWR meter would make no 
>difference in the SWR reading.   I was wrong.  Sorry, Jon.  

Only, if the transmission line was 50 Ohms and the load was of a different impedance (ie: a 100 Ohm load on a 50 Ohm transmission line measured with a 50 Ohm instrument). 

A half wave transmission line with a load at end A, repeats the impedance of that load at point B (end of the line).

For your specific case, you are correct.  So one cannot always say that placing an SWR meter at different points in a line will not change the SWR.  But if the characteristic impedance of the line and the SWR meter is the same, it will always read the same SWR.

In your example, if we used a 93 Ohm SWR meter the SWR would measure 1.86 not matter where it was placed along that transmission line.

73,

Jon
KE9NA


--------------------------------------------------------------------------
The Second Amendment is NOT about duck hunting!


Jon Ogden

jono@enteract.com
www.qsl.net/ke9na

"A life lived in fear is a life half lived."


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