OK, for the youngsters in the group a bit of history.
It's over 100 years ago.Coax has not been invented yet.There are no SWR metersThere are no VNA's.? ?(Well, an RF Bridge and a lot of math will get much the same answer)
So you would walk along the parallel transmission lines between the transmitter and the antenna with a voltmeter.
At one point along the line you measured 50 volts, at another point you measured 25 volts.
Voltage Standing Wave Ratio is 50/25? or 2
These peak and nulls were waves of voltage that pretty much stayed in the same place, thus were called? "Standing Waves"
If at some point you got a ZERO voltage, this usually happened when there was an open or a short in the system, then.
VSWR was 50/0 and was just called "Infinite"
Now if you walked along the line and got 50 - 50 - 50 - 50 - 50
Then VSWR was 50/50 or 1And they liked to say the SWR was "FLAT"
Hope this helps, Kent
For the other old farts in the group, yep, still have a slotted line in the back garage.? Think I still know how to use it, but the HP-8510C does such a better job. hihi? ? Oh yea, the Nano's do a pretty good job and weight 200 lbs less!
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On Wednesday, August 10, 2022 at 11:45:22 AM CDT, KENT BRITAIN <wa5vjb@...> wrote:
VSWR
Voltage Standing Wave Ratio
The cause is the impedance mismatch.
The measurement is in volts.???
Kent
