Slightly deviated topic : I haven't really ever been able to talk to my prs10 via serial and change or check my PLL status/settings. Any tips here??checked the internal jumpers and resistors.
On Thursday, November 27, 2014, Bob Camp <kb...@n1k.org> wrote: > Hi > > > On Nov 27, 2014, at 8:05 PM, Don Latham <d...@montana.com <javascript:;>> > wrote: > > > > I’ve just replaced the SR620 oxco option 01 with a Morion, by simply > adding a 7812 to the 15 v heater feed. Locks well with either gpsdo or > cesium external source. Don’t forget to turn on the external option and set > the frequency for 5 or 10 MHz. It took about 5 days for the Morion to > reasonably settle down. > > I agree about the Rb, has to be set with Gpsdo anyway, and I’ve already > had 2 of them go South. > > I’ve had much better luck with Rb’s once I started heat sinking them > properly. I pretty much ignored that issue early on and would regularly > loose them. So far I have not lost one with a decent heat sink (and sub 40C > baseplate). Without heat sinking, some of them are up around 60-70C on the > baseplate. Internal temps are even higher. > > Bob > > > > > Prescalers from RFBay. > > > > Don > > > >> On Nov 27, 2014, at 4:25 PM, Brooke Clarke <bro...@pacific.net > <javascript:;>> wrote: > >> > >> 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 <bro...@pacific.net > <javascript:;>> 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 -- time-nuts@febo.com <javascript:;> > >>> To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >>> > >> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@febo.com <javascript:;> > >> To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com <javascript:;> > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com <javascript:;> > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.