Ahh, I read "adjust the regulated float power supply to 28 volts" as including the protection diode as part of the PS and 28VDC straight to batteries.
Have a half built setup like this on the bench right now. 36VDC unreg supply feeding 2 LM317 regulators with 5amp diodes on output. Once floats a series pair of small 12v gelcells at 27.2 and the other a single at 13.6 Need to get the enclosure and the AC filters done, they will be 24/7 powering 10811B type OCXO I want to setup as a standalone ref. On 10/25/14, 5:54 PM, Tom Miller wrote: > I really don't disagree with you. I did say run the supply at 28.0 and use a > diode off the supply to the battery. That would place the float voltage at > 27.3 or so. Best would be to follow the manufacturers float service > recommendations. Ideally it should also be temperature compensated with > a -2.4 mV/°C slope. Not a problem with how we use these in the lab though. > > And yes to get the longest run time, just power the main unit from the > battery as Bob suggested. > > Now I am just waiting on some DB-9 connectors. I ran out of them and the > local RatShak went TU. > > Tom > > ----- Original Message ----- > From: "Christopher Brown" <cbr...@woods.net> > To: <time-nuts@febo.com> > Sent: Saturday, October 25, 2014 5:32 PM > Subject: Re: [time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup > > >> >> Might want to dial that back a bit. >> >> Since 12V/7ah batteries are mentioned I am assuming standard small >> gelcell units. >> >> Proper float voltage for a deep cycle is lower than a SLI type, and >> gellcell even lower. >> >> Generally 13.6 - 13.8 would be the gellcell range, with 13.6 being right >> on for long life use of _small_ batteries. Equalizing charge wold be 14 >> - 14.2. >> >> Floating a small gelcell at 13.6 (27.2) v.s. 14 can mean the diff >> between 12 - 24 months v.s. 5 - 7 years service life. >> >> On 10/25/14, 11:39 AM, Tom Miller wrote: >>> These units are ideal for powering via a float charged lead acid battery. >>> Use two 12 volt / 7 AH batteries in series and adjust the regulated float >>> power supply to 28.0 volts. Be sure to use a diode from the supply to the >>> battery just in case the supply can't be back fed during a power fail. >>> >>> Tom >>> >>> >>> >>> ----- Original Message ----- >>> From: "Bob Camp" <kb...@n1k.org> >>> To: "Bob Stewart" <b...@evoria.net> >>> Cc: "Time Nuts" <time-nuts@febo.com> >>> Sent: Saturday, October 25, 2014 3:01 PM >>> Subject: Re: [time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup >>> >>> >>>> Hi >>>> >>>> Spend the effort, get an antenna outside the house. Beg / borrow / steal >>>> a >>>> UPS. Even a brand new one is less than you paid for the 3812. >>>> >>>> >>>> Bob >>>> >>>> >>>> >>> >>> _______________________________________________ >>> 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.
