- This topic has 2 replies, 3 voices, and was last updated 6 years, 6 months ago by Anonymous.
Ivan IonovParticipantIvan Ionov November 20, 2015 at 6:51 am
On a SA44 the Spike software has spur rejection option, and it does a very good job on a stable signal (and fails on hoping, pulsed or fast changing signal).
The BB60c has a hardware spur rejection, it does a good job on all types of signal, but sometimes leaves small spurs. Can the software spur rejection help here as well (for stable signal)? I see this option in Spike, when it’s on, it takes longer time to do sweep, but I see no difference in output signal, small spurs aren’t filtered out.
Can the BB60c have benefit of both, hardware and software spur rejection?
Justin Crooks November 20, 2015 at 11:10 am
- This reply was modified 6 years, 7 months ago by Justin Crooks.
The BB60C spur reject option will generally remove input-related spurious (signals generated from image frequencies, harmonic mixing products, etc.). What it cannot remove is residual signals from internal clock multiples. It also cannot remove intermodulation products from the input itself (e.g. strong 101 MHz and 103 MHz produce low-level 99 and 105 MHz IM3).
If you see the signal with no input, it is probably a residual clock multiple (typically 10 MHz intervals, sometimes stronger 80 MHz multiples), which unfortunately cannot be removed. These should be below -106 dBm at maximum sensitivity, and are typically around -120 dBm except for a couple of spots.
If you suspect intermodulation products, increase the reference level. This will decrease artifacts from intermodulation.
As per my experience the BB60C spur reject option will generally remove input-related spurious.
And it cannot remove is residual signals from internal clock multiples.
Also it cannot remove intermodulation products from the input itself.
If you see the signal with no input, it is probably a residual clock multiple.
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