[AMPS] SWR and line length, etc.

[jono@enteract.com (Jon Ogden)]

Roger D. Johnson wrote:

>Oops! Your turn to be wrong. At 1/8 wave down the line the R component
>is
>about 40 ohms and the X component is -30 ohms. With a resistive load the
>
>R component never goes to zero.

Oops!  Roger, you are correct.  Mea Culpa!

I messed up reading the Smith Chart.  Your right.  The impedance read on 
a Smith Chart is the intersection of the constant resistance and the 
constant reactance curves.  At 1/8 wave from the 100 Ohm point (2.0 
constant resistance circle), the normalized values are 0.8 Ohms real and 
0.6 Ohm imaginary (0.8-j0.6).  In the 50 Ohm world that is 40-j30 just 
like you said.

When I was reading the chart this afternoon, I noticed that but ignored 
it since I was thinking in terms of an X-Y axis.  At 1/8 lambda, you have 
no X component.  But that's not the proper way to read a Smith Chart.

I stand correct.  Let the record say that!

Thank you for pointing it out instead of throwing inuendos like others!

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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