Anybody in the middle of the country (Kansas City) have a maser or 5065a? I want to test my super-charged gpsdo but don't have the tools.
Doc KX0O Sent from my iPad On Oct 21, 2012, at 11:43 AM, [email protected] wrote: > John > I agree with your observations. Before my time nuts time I did make the > mistake of getting rid of my 5065A since I did have a Shera disciplined FRK > and had gotten hold of quite a few HP5061A's and FTS 4000's. Big mistake. > Gave no attention to A/V. Phase noise yes but I went about it by focusing on > a > low noise 100 MHz XO PLL as part of low noise signal generators, my key > interest. > Recently how ever I was given a 5065A RVFR and thanks to Corby I know its > performance and I am combining it with later technology, M1000, temperature > control and a modified Shera, hoping for some outstanding results. If you > are interested contact me off list and I send you some pictures. Will take > some time to complete because of some other time nuts projects one of which > I hope Corby will report on. > Bert Kehren > > > In a message dated 10/21/2012 11:58:56 A.M. Eastern Daylight Time, > [email protected] writes: > > Hi Edgardo -- > > One slightly frustrating thing about the 5065A is that its frequency > settability isn't as good as its short term stability. I believe the manual > says that the small divisions on the C-field counter dial are 2x10e12, and > it's hard to set closer than that. > > A good 5065A is a remarkable piece of gear, with medium term stability > over, say, 1K to 100K seconds that is very hard to beat by anything other > than > a maser. As best I can measure mine against a number of other sources (no > maser here, sigh), it is around 1e13, maybe a bit better, over that range. > That's an order of magnitude better than any of the telco Rbs. > > This is just a guess, but from some data that tvb and others have > reported, I suspect that external tempco is the main limiter for medium term > stability in the 5065A. It would be interesting to see one in a > temperature-controlled environment vs. one that's not. > > John > > On Oct 21, 2012, at 11:11 AM, Edgardo Molina <[email protected]> wrote: > >> Dear Corby, >> >> Good morning. Thank you for the detailed instructions to bring the 5065A > close to desired frequency. I couldn't have a cleaner explanation of the > process. >> >> Yesterday evening I tried adjusting the C field in small steps using a > mixer, lpf and two oscillators setup as my current frequency counter is not > able to resolve de small increments/decrements of frequency adjustment. > Still I could detect the adjustments as I performed them. The response is > quite fast. I have been told that these units are really stable compared to > the > small telecom Rb units. I heard a comment that the 5065A is even more > stable than the new Symmetricom units using the X72 Rb module. Have you ever > measured such differences in stability? >> >> Thank you. >> >> Regards, >> >> >> >> >> Edgardo Molina >> Dirección IPTEL >> >> www.iptel.net.mx >> >> T : 55 55 55202444 >> M : 04455 20501854 >> >> Piensa en Bits SA de CV >> >> >> >> Información anexa: >> >> >> >> >> CONFIDENCIALIDAD DE INFORMACION >> >> Este mensaje tiene carácter confidencial. Si usted no es el destinarario > de este mensaje, le suplicamos se lo notifique al remitente mediante un > correo electrónico y que borre el presente mensaje y sus anexos de su > computadora sin retener una copia de los mismos. Queda estrictamente > prohibido > copiar este mensaje o hacer usode el para cualquier propósito o divulgar su > en > forma parcial o total su contenido. Gracias. >> >> >> NON-DISCLOSURE OF INFORMATION >> >> This email is strictly confidential and may also be privileged. If you > are not the intended recipient please immediately advise the sender by > replying to this e-mail and then deleting the message and its attachments > from > your computer without keeping a copy. It is strictly forbidden to copy it or > use it for any purpose or disclose its contents to any third party. Thank > you. >> >> >> >> >> >> On Oct 19, 2012, at 5:55 PM, [email protected] wrote: >> >>> Edgardo, >>> >>> You do use the C-field adjust to put a 5065A "On frequency". The Factory >>> values are a moot point after all these years! >>> >>> Just incrementaly adjust the c-field control in small steps while >>> observing the frequency comparison. >>> >>> The only thing that might happen is that you reach one end of the > C-field >>> pot before getting to the frequency you want. >>> >>> If that is the case you will need to set the synthesizer switch to the >>> next value in the chart. (either up or down depending on which way you >>> ran out of room.) >>> >>> Then start over with the c=field adjustment. >>> >>> If you switch the synthesizer setting you will need to remove power >>> momentarily to reset the synthesizers lock indication circuit. Otherwise >>> pushing the logic reset button to get the green light wont work. >>> >>> Corby >>> ____________________________________________________________ >>> Woman is 53 But Looks 25 >>> Mom reveals 1 simple wrinkle trick that has angered doctors... >>> http://thirdpartyoffers.juno.com/TGL3141/5081da95575015a951151st02duc >>> >>> _______________________________________________ >>> 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. > > _______________________________________________ > 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. _______________________________________________ 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.
