Quick preview: Gone are the notches of the SMA/NWT devices!
Hi,
Everyone using the SMA/NWT/D6 devices know that there is this issue with the "notch" that appears on transponders/signals with less than 500kHz bandwidth.
See full description of the issue here:
https://vma-satellite.blogspot.com/2017/10/some-consideration-about-limitations-of.html
It looks like this:
Well, I am proud to announce that today I finished the top item on my TODO list, regarding the VMA Simple Spectrum Analyser software: an automatic removal of these notches!
When this function is activated, the software will look for the notches and filter them out. This is not 100% correct, I know, but the spectrum does look much better and many measurements that were not possible before, can now be done.
This is how the same signal looks with the "Notch" checkbox checked:
The "notch filtering" will apply to all traces/measurements!
Here two more samples of my local FM radio band.
Without "notch filtering":
With "notch filtering":
Notice how the radio station frequencies can now be recognized correctly, because the notches are not messing up the center frequency of the carrieres/transponders.
The new software version will be published soon - there still are some fixes required.
Regards,
Vitor
Everyone using the SMA/NWT/D6 devices know that there is this issue with the "notch" that appears on transponders/signals with less than 500kHz bandwidth.
See full description of the issue here:
https://vma-satellite.blogspot.com/2017/10/some-consideration-about-limitations-of.html
It looks like this:
Well, I am proud to announce that today I finished the top item on my TODO list, regarding the VMA Simple Spectrum Analyser software: an automatic removal of these notches!
When this function is activated, the software will look for the notches and filter them out. This is not 100% correct, I know, but the spectrum does look much better and many measurements that were not possible before, can now be done.
This is how the same signal looks with the "Notch" checkbox checked:
The "notch filtering" will apply to all traces/measurements!
Here two more samples of my local FM radio band.
Without "notch filtering":
With "notch filtering":
Notice how the radio station frequencies can now be recognized correctly, because the notches are not messing up the center frequency of the carrieres/transponders.
New version available for download!
Regards,
Vitor
don't you have thought about incorporating your developments for astronomical observations using radio telescopes? Your work is simply fantastic, congratulations!
ReplyDeleteThank you! Unfortunately I know next to nothing about radio telescopes, so I don't know how to develop for this application...
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