[time-nuts] E4437B phase noise spurs. Any ideas?

Wolfgang DL1SKY timenuts at triplespark.net
Thu Jul 16 05:15:16 EDT 2015


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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