Hi David:
For me the key benefit of the SR620 is the 16 digit display. That implies a lot of digits in the reference (although
not all 16 of them) so I always use an external reference.
When I turn the PRS-10 upside down the crystal changes frequency and the Rb
corrects the crystal, see:
http://www.prc68.com/I/PRS10.shtml#Accel
http://www.prc68.com/I/Images/FC_ROT.jpg
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 27 November 2014 at 22:15, Brooke Clarke <[email protected]> wrote:
Hi David:
Hi Brooke
If you look just to the right of the SR620 you will see a separate box that
contains the PRS10.
Ah, I missed that!!!
I was thinking it fitted inside the SR620, but obviously not.
The PRS10 can work as either a Rb GPSDO or as a time stamping device. For
the SR620 any GPSDO would make a good external reference.
It would have been nice to have a better reference inside, as
sometimes I move equipment around, and don't always want to take more
than necessary, so having a better reference inside would have been a
nice thing, but I see it is not what I thought.
This unit I purchased has the option 01, the ovenized VCXO, but of
course that is not going to have the long-term stability of a Rb
source.
I see one of the SR625 add-ons on eBay,
http://www.ebay.com/itm/STANFORD-RESEARCH-SYSTEMS-SR625-2GHz-PRESCALER-/281486714451?pt=US_Marine_Aircraft_Radios&hash=item4189ea6653
but it does not look in good condition, so I'm not paying $700 for it.
Dave
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
