Hi How much is your unit moving?
Bob > On Nov 13, 2014, at 1:50 PM, paul swed <paulsw...@gmail.com> wrote: > > On the older units that used a RB to control an Xtal. They created a mix of > 5 Mhz +10 Mhz and that produced 15 out that hit an amplifier to drive a 12 > way splitter. > I think I reverse engineered the circuit. Its on paper and filed. Oh that > ends this discussion. > Anyhow it was not hard to figure out. > I am still baking my Lucent in so want to see if it settles. > There is just the barest of hints it may be. > > So do not want to power down to explore. Happy to dig in if I don't have to > return the unit. > > Regards > Paul > WB8TSL > > On Wed, Nov 12, 2014 at 7:21 PM, Bob Camp <kb...@n1k.org> wrote: > >> Hi >> >> The chain in the Z3810 / 3811 / 3812 Lucent boxes is *much* different than >> the setup in the earlier parts. The phase noise and ADEV on the Z3810’s is >> better than what you got on the earlier versions. That makes keeping the >> noise down in whatever mod you do more important. The existing 10 MHz >> output on the Z3810 setup is a real good example of how a seemingly simple >> thing can add a lot of phase noise and even mess up ADEV. >> >> I don’t think the 15 MHz is used for much of anything in the Z3810. That >> could be wrong, but I can’t see where it is needed based on poking around a >> little. The 15 MHz buffer appears to be quiet and puts out a lot of power. >> Using it for 10 MHz would give you a *lot* of 10 MHz signal to play with. >> IF the mods are simple it’s an attractive solution. If it involves swapping >> out 30 parts - not so much. >> >> Bob >> >>> On Nov 12, 2014, at 5:50 PM, Perry Sandeen via time-nuts < >> time-nuts@febo.com> wrote: >>> >>> Wrote: At some point we will get into hacking the main board >>> to switch from 15 MHz to 10 MHz. >>> >>> One doesn’t have to that if one uses the two IC divide by >>> 1.5 circuit I offered the list. I specifically found it so I didn’t have >> to >>> hack the innards. >>> >>> Wrote: The great news is the oscillator is 5 Mhz. >>> >>> Don’t bet the rent on that. My early units have 10 MHZ Datum >>> oscillators. >>> >>> Bob’s point about getting the GPSDO’s if all cost the same >>> is a good point. >>> >>> Another point. At least on the older units I have: GPSDO, >>> Rubidium, and Crystal oscillator, the output circuitry after the 15 MHz >>> conversion takes place is the same. So if one hacks the 10 Mhz into the >> chain, >>> all one has to do is remove or bypass the 15 MHz filter before the >> output. >>> >>> Even if you don’t have the rubidium unit but have either/or >>> GPDO or Crystal oscillator email me off list for the rubidium schematic >> as >>> after the logic chips they use the same circuit. >>> >>> Regards, >>> >>> Perrier >>> _______________________________________________ >>> 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. >> > _______________________________________________ > 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.
