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Originally Posted by rabbit73
There appears to be spurs in all three of my scanners, but it's not unexpected in equipment that isn't lab grade. ...
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Yes.
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The RTL-SDR dongle has a lot of spurs ...
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Have noticed that in the low cost RTL devices. Most of the time not a problem if one is aware of their presence.
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...I think the Spectrum Spy scanner for the R2 is a lot cleaner than the RSP Spectrum Analyzer for the RSP1A...
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Interesting.
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..The dB scales on my three SDRs are relative, not absolute.
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Yes, the unit of dB itself is relative.
When uses as dBm or dB(other), then it takes on more absolute meaning.
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Curious about scale accuracy, sorta related to scale linearity:
Is a dB indicated, an actual dB.
For example:
Is a -20dB indication really 10dB less than a -10dB indication? Or,
Is the delta, 9 or 11 dB or some other number.
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...I think there are offset adjustments for the relative scale,...
....I don't think the relative scales of either one could be considered "accurate" with so many stages in series.
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Thanks for the information and the images, helps to better understand these interesting devices.
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