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I am a bit confused on the Marker Menu and the Markers in general.
I know I can turn them on and off and move them and read the values on the screen.
I know that I can click on one and then the others show a Delta value.
What I do not understand is the >Start, >Stop, >Center, etc on the marker menu and what they do.
Any help or point to a description would be appreciated.
Larry
n0sa

Never mind, I finally found the information I was looking for.
As usual, as soon as I post a question, I find the answer.
Larry
n0sa

Hi Larry,
I can explain stop, start and centre but not span:

Essentially, these commands allow you to set the frequency range or span using the position of the active marker. Make sure the current onscreen frequency span is greater than what you actually require so you can use the marker settings to 'zoom-in'.

For simplicity, enable only one marker.

Now place (drag) the marker to the starting frequency of the range you want to investigate. You can read the marker freq onscreen at the upper right area of the display as you move it.

Open the Marker menu and click the Start button and you will see the start freq at the lower left of the display change to the current marker freq.
Now move the marker to the maximum frequency of the range you're interested in and again, open the Marker menu and press the Stop button.

The upper frequency shown at the lower right of the display will now change to that value. You now know how to set the start and stop frequencies using the marker menu.

To set the span, you will use the Center menu button. You set the start freq as before but the second entry will be to move the marker to centre frequency you're interested in and press the Center menu button. This will automatically adjust the start and stop frequencies to be equal, either side of of the center.

As for the Span button, it just turns green when pressed and does not seem to do anything. I will have to look at the source code to see what that's about.

I hope this helps. I will update the user guide with this information soon.

Regards
Larry

Thanks Larry, I didn't get that from the manual but sounds good.
Thanks
Larry
n0sa

I figured out how the Marker Span button works.?

You need to have TWO or more markers (M1-M4) enabled for the Span button to work.?

Essentially, when you press the Marker Span button, the last two ACTIVE markers will be used to set the frequency span to the current upper and lower marker freq values.??

It doesn't matter if you have 3 markers displayed. If the last two you moved were M2 and M3 and even if M2 is at a higher frequency than M3, the span will be set using the lowest and highest values of the 2 markers.?

I hope this helps with using the markers on the NanoVNA.?

Cheers and Holiday Wishes to All !
Larry. VE3LRI


On Sun, 22 Dec 2019 at 12:37 PM, Larry Rothman<nlroth@...> wrote: Hi Larry,
I can explain stop, start and centre but not span:

Essentially, these commands allow you to set the frequency range or span using the position of the active marker. Make sure the current onscreen frequency span is greater than what you actually require so you can use the marker settings to 'zoom-in'.

For simplicity, enable only one marker.

Now place (drag) the marker to the starting frequency of the range you want to investigate.? You can read the marker freq onscreen at the upper right area of the display as you move it.

Open the Marker menu and click the Start button and you will see the start freq at the lower left of the display change to the current marker freq.
Now move the marker to the maximum frequency of the range you're interested in and again, open the Marker menu and press the Stop button.

The upper frequency shown at the lower right of the display will now change to that value.? You now know how to set the start and stop frequencies using the marker menu.

To set the span, you will use the Center menu button.? You set the start freq as before but the second entry will be to move the marker to centre frequency you're interested in and press the Center menu button.? This will automatically adjust the start and stop frequencies to be equal, either side of of the center.

As for the Span button, it just turns green when pressed and does not seem to do anything. I will have to look at the source code to see what that's about.

I hope this helps. I will update the user guide with this information soon.

Regards
Larry