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Hi guys,
Any recommendations for how best to implement a swept/switched preselection filter to turn my SA44B into something closer to an EMC receiver?
I found Hittite/Analog Devices’ MMIC tunable filter parts but they are outside the frequencies of interest, and also, by and large, obsolete.
I was thinking running a tunable LPF with a tunable HPF so I could create a variable BPF, or, because this is looking like a right pain in the backside, making a bunch of BPFs and switching them, and components in them, to cover the standard CISPR22 EMC range.
Or does someone have a better approach??
JaredJared,
Because the SA series uses a software algorithm for image rejection, it is not a good candidate for EMC precompliance (except possibly for measuring fixed clock harmonics).We will be adding a preselector to the BB60D, which should be out later this year.
In the short run, assuming you are focused on accurate harmonic measurements, a high pass filter to remove the fundamental but pass the harmonics is a good solution. Mini Circuits has a collection of low cost SMA high pass filters.
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