Hi With the Rb pulling about 700 ma at 15 volts, it's going to nuke a battery pretty fast. You may find that (unlike an OCXO) the Rb comes back up to frequency fairly quickly (minutes /hours not days / weeks). Simply unplugging it and carrying it power off could be workable approach.
Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Wednesday, January 11, 2012 11:56 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] FE-5680A Mechanical Question Bill, Brian, Bill, and Peter, Thanks for the info. All I need now is a 'project' to incorporate the unit into. In the back of my mind, I have the thought of a 'box' that will be battery powered or 110 VAC powered (perhaps with an internal SLA battery) and include a GPSDO and Rb unit (possibly a GPSDRbO) for the purpose of a 'reference' for portable operation in the microwave regions. Ah!!!! Dreaming! Makes looking forward to retiring very attractive! Joe -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Peter Bell Sent: Wednesday, January 11, 2012 10:28 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A Mechanical Question The pot accessible through the hole in the casing appears is the fine frequency adjust pot on the older units - on these, it's connected to an ADC input, but as far as I can see adjusting it does nothing at all. There are two screws hidden under the labels that hold the top over on - you also need to remove the two small screws on the side that bolt the D-type mounting bracket in place. Regards, Pete Bell On Thu, Jan 12, 2012 at 10:33 AM, J. L. Trantham <jlt...@att.net> wrote: > Boy!!!!!!! I would have 'screwed' that up! > > Bill was correct. Mine were 1/16th inch Allen screws, not Torx as Brian > has, and were very easily removed. They appear to be 3mm dia. X 5mm long > with a 0.5mm pitch screw, in spite of having a 1/16th inch hex opening. > > There were two Phillips head screws underneath that appear to hold the > bottom cover in place. > > On another topic, there is a small opening on the side (near the > 'FE'Trademark) with what appears to be a multi-turn pot inside. What is > that? > > Also, the 'sticker' on the top, that includes the 'FE' Trademark, > 'FE-5680A', etc., has a 'soft spot' on the bottom edge. In addition, there > is a 'soft spot' under the 'sticker' at the bottom of the front, near the > connector, and includes the serial number. Does anyone know what is under > these 'stickers'? > > Thanks again. > > Joe > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Brian, WA1ZMS > Sent: Wednesday, January 11, 2012 8:52 PM > To: 'Discussion of precise time and frequency measurement' > Subject: Re: [time-nuts] FE-5680A Mechanical Question > > My "rivets" were tiny Torx screws. > > > -Brian, WA1ZMS > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of J. L. Trantham > Sent: Wednesday, January 11, 2012 9:22 PM > To: 'Discussion of precise time and frequency measurement' > Subject: [time-nuts] FE-5680A Mechanical Question > > Should I ever have time to pursue the Rb unit, what happens when I 'drill > out' all the rivets that mount the unit to the PCB that it arrived on? Any > reason to keep it on the PCB? > > > > Does the bottom cover come off? Will I need to replace the rivets with > something else to keep the bottom cover on? > > > > Thanks in advance. > > > > Joe > > _______________________________________________ > 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. _______________________________________________ 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.