wrote in message ...
Reg Edwards wrote:

I suggest considering a slotted line where the measured RMS
voltage is a function of position along the slot (when a
standing wave is present).

===========================

Voltage is a function of position along the slot even when a standing wave
is NOT present.

I think there is one case where it doesn't vary and three where
it does:

Matched lossless line: RMS voltage will be the same everywhere
Mismatched lossless: RMS voltage varies - the standing wave
Matched lossy line: RMS voltage declines towards the load
Mismatched lossy line: RMS voltage varies and declines towards the load

...Keith


I'd agree with Keith on this, but you guys are talking about a NET
voltage at one point! That will not be the same as the forward and reflected
Vrms! I have to agree with Cecil on this one.


Slick

(Garvin) wrote in message . com...

....
But i'd rather use what is called a directional coupler, and get the
rho from that.

And of course you understand how directional couplers work, right?
Like I told you a while back, be sure it's calibrated to the line
you're measuring.

You need to hit the basic RF books a bit more, my friend.

So, Garvin, please understand this: the model I use for TEM
lines leads to results which are self-consistent and which
match experimental results with respect to all voltages,
currents and powers. It works with both steady-state and
transient conditions. It does all that independent of you
disagreeing, and independent of you calling people liars.
And you would have me forsake it for a model which is
inconsistent, which leads to voltages and/or currents at
the load end of the line which do not match the voltage and
current in the load? You would have me forsake it for a
model which leads to confusion about what's happening with
power, and which does not match what we measure
experimentally? Noooo, I don't think so. Have fun trying
to sort it all out, mon.

Cheers,
Tom

This is like telling Moses to read those tablets again . . .

--
73/72, George
Amateur Radio W5YR - the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"Starting the 58th year and it just keeps getting better!"






"Tom Bruhns" wrote in message
...
(Garvin) wrote in message
. com...

...
But i'd rather use what is called a directional coupler, and get
the
rho from that.

And of course you understand how directional couplers work, right?
Like I told you a while back, be sure it's calibrated to the line
you're measuring.

You need to hit the basic RF books a bit more, my friend.

So, Garvin, please understand this: the model I use for TEM
lines leads to results which are self-consistent and which
match experimental results with respect to all voltages,
currents and powers. It works with both steady-state and
transient conditions. It does all that independent of you
disagreeing, and independent of you calling people liars.
And you would have me forsake it for a model which is
inconsistent, which leads to voltages and/or currents at
the load end of the line which do not match the voltage and
current in the load? You would have me forsake it for a
model which leads to confusion about what's happening with
power, and which does not match what we measure
experimentally? Noooo, I don't think so. Have fun trying
to sort it all out, mon.

Cheers,
Tom

Reg, G4FGQ wrote:
"Voltage is a function of position along the slot even when a standing
wave is NOT present."

Yes but within the short length of a short slotted line, the line loss
is likely so small that the voltage will appear constant along the slot
in the absence of a reflected wave.

Best regards, Richard Harrison, KB5WZI