the phase noise testing of a SMB200 OCXO

I bought the OCXO from one Signal Hound service partner (in Chengdu, China), to my surprise is that the phase noise is so high, 10Hz is -82dBc, how SMB200 keep the low noise using such OCXO (KVG) ?
obviously the OCXO already been tampered by someone (the shell be opened before), this is Signal Hound official partner ?

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Hi Testpoint,

Can you provide the following information,
– What company did you purchase this part from?
– When did you make this purchase?

Can you please send your replies to support@signalhound.com.

Also, the SM200C phase noise is specified at -76dBc at 10Hz offset.

We look forward to your response.

To clarify, the phase noise of the OCXO itself, at a 10 Hz offset, should be better than -105 dBc/Hz. Generally to measure these numbers, a phase noise tester will need a significant number of correlations.

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