miran December 16, 2020 at 1:16 pm
- This topic was modified 2 years, 11 months ago by miran.
I want to create frequency mask like shown in the picture. Between frequency 0 Hz and for example 100 kHz I want to have line a few dB over the maximum. I can’t make line (red in the picture) because it is impossible to enter 0 Hz as start frequency. The lowest frequency for start frequency is 1 kHz. Why?
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AndrewModeratorAndrew December 17, 2020 at 9:31 am
It appears that the 1kHz minimum is an artificial limitation in the software. We could look into removing this limitation in a future release of the software.
The best you could do right now create an offset between 1kHz to 100kHz.
Additionally, given your current settings, if you create an offset that is higher than the measured channel power, it would never fail. Is this close in offset for visual indication only?
Also, the channel power bandwidth used when “Auto” is selected is based on your current offsets. If you created an offset that comes all the way in to 1kHz or below (given a software update), you will want to manually set the channel power bandwidth.
With your current RBW of 300Hz, being able to specify a start frequency of < 1kHz would only test a few additional points. Are you testing against a standard mask? I look forward to your response. Regards
miranParticipantmiran December 17, 2020 at 11:36 am
Like always I’m very happy for your quick response. I hope really that in some next version of Spike this limitation will remove. Especially if this is just software limitation. At the moment I don’t have problem for waiting for remove this limitation. by the way, I don’t use only SA44B, BB60C I’m also very proud users of SM200A. The development of software Spike is very important. I appreciate that very much. Thank you again and happy new year and merry christmas.
AndrewModeratorAndrew December 31, 2020 at 12:52 pm
Do you have any documentation for the mask you are trying to create? Any standard documents we can review? As it stands, given your current settings, reducing the minimum frequency of the offset to 0Hz instead of 1kHz would have no effect on the measurement. It would never fail in this region. If we extend this lower frequency, I would like to do it in a way that meets your requirements.
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