Grant wrote:
I tamed the provided switching power supply noise with some L's and
C's, and am now looking at the 10MHz output on a spectrum analyzer.
Here is what I measured:
10MHz +9dbm
20MHz -50dbm
30MHz -37dbm
no obvious higher harmonics
broad noise envelope at 60 > 75MHz @ -60dbm peak
Are these results typical or might I have an adjustment or other problem?
I unhooked my primary Tbolt from the distribution system and ran it
straight into the 50 ohm input of a SA. My results:
10 MHz +12.66 dBm
20 MHz -57.85 dBc
30 MHz -59.54 dBc
40 MHz below noise floor
50 MHz -67.78 dBc
My noise floor was about -80 dBm (~ -90 dBc). I saw nothing else
above this floor from DC to 150 MHz except for 60 Hz (at -83
dBc). Surprisingly, the power line harmonics were all below the noise floor.
Best regards,
Charles
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