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.
