Another option is to use an OCXO. You have to go pretty nuts to get a
modern frequency agile gadget to beat the spectral purity of a decent
oscillator. And here pretty nuts is probably an understatement. If you
only need frequency stability, the OCXO is a solid option assuming you
can get one with the proper freq.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 01-Jan-19 6:05 PM, Mark Goldberg wrote:
On Tue, Jan 1, 2019 at 4:40 PM Jeff Blaine <[email protected]> wrote:
Take a look at the plots at the bottom of this page.
http://hpmemoryproject.org/technics/bench/3048/hp_sources_02.htm
Note the 8642b vs the 3325B. The '42b has much lower ultimate noise far
out but see how decent the 3325B is in comparison. HP really made great
stuff back in the day!!!
Thanks for pointing out that page. My measurements of my 8642A looked
better than that far out, but are pretty similar close in. Comparing the
3325B to my measurements of TCXOs and transmit Phase noise of the TS-590,
I'm not sure it will be good enough far out to meet the 590's original
performance.
On Tue, Jan 1, 2019 at 4:29 PM Brooke Clarke <[email protected]> wrote:
Hi Mark:
It's not clear to me why pager testing requires such good phase noise. I
wonder if some of the amateur modes also have
that need?
Maybe WSPR?
https://prc68.com/I/DRM.shtml#WSPR
The reason for good phase noise in amateur gear is if you operate in close
proximity to another strong station while trying to receive a weak one. The
phase noise will cause far out noise from the strong signal to overwhelm
the weak one. There are lots of examples on the web, explained better than
I could.
Regards,
Mark
W7MLG
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
