[time-nuts] OXCO Spurious Output at Line Frequencies

[Scott Stobbe]

Unless your DUT is in a mu-metal enclosure, I wouldn't say observing the
same results while battery powered provides any conclusive statement as to
whether or not its the DUT. The terminals around a crystal are pretty high
impedance at line frequencies.

On Tue, Jul 12, 2016 at 6:44 AM, Martyn Smith <martyn at ptsyst.com> wrote:

> Hello,
>
> I have a customer who is measuring the phase noise of my 10 MHz ultra-low
> phase noise frequency standard.
>
> He is seeing spurious signals at line frequencies (50 and 100 Hz as we are
> in Europe) at a level around -130 dBc.
>
> My opinion is that it's impossible to get much better than that.  Even
> running on batteries make little difference, since the equipment is in a
> test rack with AC signals everywhere.
>
> Even the £50k R&S test set he is using only quotes a spurious spec of -90
> dBc.
>
> What experience does anyone have here?
>
> Best Regards
>
> Martyn
>
>
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