[TowerTalk] Idea for the 259B ?

[Michael Tope]

Yes, Jim, you need to know the length of the feeline
to de-imbed the antenna impedance. I suspect the feature
could be added to the unit, but somekind of open/short/
50 ohm load calibration procedure would be required  
at the antenna end of the feedline. 

Mike, W4EF..............

----- Original Message ----- 
From: "Jim Reid" <kh7m@hsa-kauai.net>
To: <W8JI@contesting.com>; <towertalk@contesting.com>
Sent: Tuesday, May 23, 2000 4:33 PM
Subject: [TowerTalk] Idea for the 259B ?


> 
> It has been wondered: 
> 
> Could  the next iteration of the MFJ-259 (maybe the
>  MFJ-269 ?)  be designed to read the ACTUAL impedance
>  at the antenna terminals, not just at the shack end of the
>  feedline?  In other words, add a chip programmed to do the
>  Smith chart calcs and display the result.  I bet it will be
>  coming soon.
> 
> But maybe the actual feedline length would also have to be
> known,  probably could not be a random unknown.  And the
> 259B  could not be used to determine the length,  as the line
> would be terminated in who knows what Z,  hi.
> 
> Well,  it was a thought.
> 
> 73,  Jim,  KH7M
> 
> 
> 
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