If you want to make measurements, you will need to invest in some sort of
equipment. To measure VSWR, you need some sort of equipment that can either
measure forward and reverse waves, measure voltage along a transmission line, or
can vary phase and possibly magnitude of impedance. The first is a directional
coupler or network analyzer, the second would be a slotted line or open wire
transmission line, and the third would be things like line stretchers or a large
selection of slightly different length transmission lines, and various sorts of
"tuners" (LC or transmission line tuners such as the double stub variety).
A directional coupler is certainly the easiest to use. The tuner option is often
used when measuring the output impedance of non-linear devices (e.g., class C
amplifiers). Open transmission lines are not often used for measurements, but
are excellent tools to demonstrate standing waves.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA
"Gordon,Ian" <[email protected]> on 09/26/2002 03:01:02 AM
Please respond to "Gordon,Ian" <[email protected]>
To: "'IEEE EMC & SAFETY PSTC'" <[email protected]>
cc: (bcc: Don Borowski/SEL)
Subject: MEASURING VSWR WITHOUT A DIRECTIONAL COUPLER
Everybody
I need to assess the uncertainty of radiated emission and immunity
measurements and thus need to measure the mismatch between components in the
systems. The frequency range of interest is 30MHz-1GHz)
Is there a way in which I can measure the VSWR of a
cable-antenna-receiver/amplifier combination without having to purchase a
directional coupler or network analyser?
The equipment I have at my disposal is: two power amplifiers (150kHz-30MHz &
80MHz-1GHz), a spectrum analyser with tracking generator (9kHz-2.6GHz),
signal generator (150kHz-1GHz), RF power meter (9kHz-1GHz) and a receiver
(9kHz-2.6GHz).
Any suggestions would be appreciated.
Thanks
Ian Gordon
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