[time-nuts] HP 58540A Phase Noise Improvements

Matt Ettus boyscout at gmail.com
Fri Jul 7 17:19:11 UTC 2006


>
> Does anyone have any suggestions as a replacement OCXO with excellent phase
> noise approaching -160 dBc @ 1 kHz?  Are there any special precautions or
> other alignments required when dropping in a replacement OCXO?  Thanks!
>

Paul,

It is very likely that the close-in phase noise of the ICOM is
determined more by the dividers in the PLL than by the phase noise of
the reference oscillator, especially at such low levels.  Assuming
that the ICOM divides the 10 MHz down to at least 100 kHz, the phase
noise of the OCXO would be divided down to -200 dBc, which is well
below the internal divider noise of the PLL.  Thus even an OCXO with
absolutely no phase noise would not improve things.

Matt




More information about the Time-nuts_lists.febo.com mailing list