Just did the pot addition to my FE5086 and it works very well The systems still warming up and its actually apart with external heat sinks for cooling so I can get to places. Hitting 8.6 ^ -12 after first eyeball adjustment on the scope drifting 5 ns in 9:36 minutes. Time to flip from scope mode to 5371 counter ns drift timing so I don't have to stick around. Hardest part is attaching the 100K resistor to the ic. Boy thats small. I plan to bring the leads out through the fake pot hole to a nice 10 turn pot for control. I also have counters for the pots.
I also do not have the 1 pps out. Not that it matters to me actually. I did probe around looking just for the heck of it and no luck. Further updates Created a excel drift calculator for use with readouts from 5371 counter. Final setting so far 4.76E-12. Clearly on my unit the pot I am using could be better and I need to adjust the range for about 0-3vdc. Had been using the 8 V regulated supply. Thanks David and Arthur for the thread and mod. Regards Paul WB8TSL On Thu, Jan 12, 2012 at 7:05 AM, Arthur Dent <golgarfrinc...@yahoo.com>wrote: > >Look forward doing other tests like voltage sensitivity and bringing > >out the C field for external adjustment. > >EWKehren at aol.com > ++++++++++++++ > >But how do you adjust the RgO output frequency? That's why I asked if > >A DDS would be used. > > >Nevermind. I just found it. The RgO cell can be frequency adjusted > >magnetically. > >David > +++++++++++++ > I decribed the very simple way I added an external EFC feature to my 5680A > unit using a pin in the DB-9 connector that was freed-up after I installed > an > internal +5V regulator inside the 5680A so I only needed a single +15V > supply to power the 5680A. Check my post of Mon Jan 9 21:06:12 UTC 2012 > to see what I did using Bill Riches information where he described > connected > an internal pot. The new EFC pin 'floats' at 2.5V and 0-5V works fine to > adjust > the frequency slightly. > > -Arthur > _______________________________________________ > 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.
