Hi, I just got a used/refurbished E4437B which I wanted to use as a all-purpose RF generator primarily for 3-4 GHz.
Unfortunately, I'm seeing strange spurs for frequencies above 2.4 GHz, see the green curve in the attached image. The yellow curve is an SMIQ03 for comparison. Observations: - For frequencies below 2.4 GHz none of the spurs appear. - It has an OCXO and I left the device in standby (oven on) for 12 hours. - If I leave the device ON for 1-2 hours, the spurs go down. Anybody else seeing this? Any ideas how to fix this? Does this look like a pre-failure sign? Regards, Wolfgang DL1SKY
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