Re: [time-nuts] Interesting HP oscillators...
On 1/13/2014 7:36 PM, Rex wrote: This document lists that part number... http://www.leapsecond.com/museum/10811a/90027-1.pdf It says (I think -- in a quick scan) that it is mostly the same specs as a 10811 D/E except a narrower EFC tuning range. When HP was doing the smart clocks circa 1997, they ignored my advice against trying to steer the EFC in favor of using a fix tuned oscillator followed with a synthesizer. The reason for this was the lack of suitable DAC's, and even if you found one, then you have to have a suitable reference source with low enough noise, and even if you found one, it would have to be ovenized. The E1938A had an available ovenized reference, however, the 10811 (as everyone knows) has only a Zener diode, and it is not very well ovenized This version (which I never heard of until now) probably ditched the Zener diode which (besides eliminating drift from the Zener) narrowed the EFC range. Narrowing the EFC range on the 10811 was a band aid that contributed another bit or three to the error budget. You had to make some assumption about long term aging and how often it was OK to ask the customer to readjust the mechanical trimmer. Also, there was the fact that no base station was going to be in service for more than a few years, as it would be obsolete by that time. Rick N6RK ___ 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.
[time-nuts] Interesting HP oscillators...
I have happened upon a pair of working HP 10811-like oscillators. They are marked HP 0507-60219. I do know they came from a special custom 1990's attempt at a single oven version of the Z3801A. Does anyone have any info or specs on such an OCXO? They are surplus to my needs and they both test fine so unless they are determined to be some kind of ultra-low PN oscillator, I could as well offer them for sale to the Time-Nuts group. Comments welcome. Regards, -Brian, WA1ZMS/4 ___ 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.
Re: [time-nuts] Interesting HP oscillators...
This document lists that part number... http://www.leapsecond.com/museum/10811a/90027-1.pdf It says (I think -- in a quick scan) that it is mostly the same specs as a 10811 D/E except a narrower EFC tuning range. On 1/13/2014 6:19 PM, Brian, WA1ZMS wrote: I have happened upon a pair of working HP 10811-like oscillators. They are marked HP 0507-60219. I do know they came from a special custom 1990's attempt at a single oven version of the Z3801A. Does anyone have any info or specs on such an OCXO? They are surplus to my needs and they both test fine so unless they are determined to be some kind of ultra-low PN oscillator, I could as well offer them for sale to the Time-Nuts group. Comments welcome. Regards, -Brian, WA1ZMS/4 ___ 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. ___ 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.
