[Amps] close to off topic - how to read antenna R + jX ??

[David Kirkby]

G3rzp at aol.com wrote:

>One point to remember about network ("Notwork") analysers is that they,  like 
>vector voltmeter and directional coupler measurements, rely on the accuracy  
>of the couplers. If you are measuring an impedance with a high SWR (e.g.  say 
>1,000 Ohms) then something like a 0.1 dB inaccuracy can lead to a +/-50%  
>error. For high SWR type measurements, a resonance type measurement is  preferable.
> 
>73
> 
>Peter G3RZP
>_______________________________________________
>  
>
Although you calibrate such systems with open and short circuit loads, 
both of which have an infinite VSWR. My guess is that the software in 
modern VNAs can take this into account, but I might well be wrong. I'm 
sure there will be an Agilent application note (I mean sales literature) 
on this!!


-- 
Dr. David Kirkby, 
G8WRB

Please check out http://www.g8wrb.org/ 
of if you live in Essex http://www.southminster-branch-line.org.uk/