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Guidelines for SWR 1:1.5 and 1:2 in SWR graph

 

Is it possible to get distinguishable guidelines for SWR 1:1.5 and 1:2 on SWR graph?
That would be very helpful for visualization of SWR measurements (acceptable SWR bandwidth for example).
 

Is it possible to get distinguishable guidelines
for SWR 1:1.5 and 1:2 on SWR graph?
Not sure what is meant by guidelines, but on the device, after setting FORMAT SWR,
then BACK to SCALE, set e.g. 0.5 SCALE/DIV and REFERENCE POSITION to 1
 

I meant lines drawn on graph that show where is 1:1.5 and 1:2 measurement regarding of the scale.
 

If you are looking for more resolution measure the mismatch in terms of return loss. You'll see that a small change in SWR shows up significantly as a change in return loss. Also, another way to look at things with more resolution is to save the data in the form of an s1p file. I have been saving the data as s1p files and then calculate everything from the magnitude of the reflection coefficient. I mean everything:). There is no increase in accuracy for sure but small relative changes are easy to see. I just paste the s1p data into Excel and use the basic formulas. For me, a non-programmer, it took a little tinkering to get the phase angles out of the +/-180 degree Smith Chart format but it was a good refresher. Once these phase angles were correct in each quadrant, all broke loose and fell out properly! I bet, with all of the programmers that follow this discussion, they have better ways to do it.
 

Well, if you're connecting to a PC anyway, I would (obviously) just use
NanoVNA-Saver ... which does have the option of putting in VSWR reference
lines. ;-)

--
Rune / 5Q5R

On Tue, 22 Oct 2019 at 22:23, WB2UAQ <pschuch@...> wrote:

If you are looking for more resolution measure the mismatch in terms of
return loss. You'll see that a small change in SWR shows up
significantly as a change in return loss. Also, another way to look at
things with more resolution is to save the data in the form of an s1p
file. I have been saving the data as s1p files and then calculate
everything from the magnitude of the reflection coefficient. I mean
everything:). There is no increase in accuracy for sure but small
relative changes are easy to see. I just paste the s1p data into Excel and
use the basic formulas. For me, a non-programmer, it took a little
tinkering to get the phase angles out of the +/-180 degree Smith Chart
format but it was a good refresher. Once these phase angles were correct
in each quadrant, all broke loose and fell out properly! I bet, with all
of the programmers that follow this discussion, they have better ways to do
it.
 

Well, I guess it is obvious that I asked for NanoVNA to do that for field use without PC. :)

That said, I did not know NanoVNA-Saver has such option. thanks fro the tip.

On 22.10.2019 22:28, Rune Broberg wrote:
Well, if you're connecting to a PC anyway, I would (obviously) just use
NanoVNA-Saver ... which does have the option of putting in VSWR reference
lines. ;-)
--
73,
Pedja YT9TP

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