Brooke and Bill, I purchased a 105B several months ago and my battery pack was dead as well.
It uses 20 size D cells in a 4 X 5 layout with the batteries positive up alternating with negative up and connected in such a manner that you have about 2.4 Volts or 0 Volts when measuring from the 'tail' of an arrow to the 'tip' of the arrow as shown in the attached picture of the cover of the battery pack. The battery in the position just above the "+24V" is + up, the one at the 'tip' of the arrow above it is - up and so on with the batteries connected with spot welded tabs. I had a new pack made up by the local battery shop out of higher capacity batteries (5 AH as I recall) and the charger circuit seems to keep it working very well. After a full charge, it will last about 8 hours after pulling the AC plug. I have mine running now for just over a week being disciplined by a Brooks Shera controller card driven by the 1 PPS from a TBolt. When comparing the 5 MHz out of the 105B to the 10 MHz out of the TBolt in a 'X Y' manner on the oscilloscope, the lissagous figure is 'frozen in time'. Simply amazing! All I have to do now is to come up with a way to convert the 24V from the battery pack to the voltages required for the TBolt (+/-12V and +5V) and the controller card (+/-5 to 12V)and I will have a battery backed up stand alone system with two (sort of) independent frequency sources. 24V should be available on pin D of J3 on the back of the 105B. Joe -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bill Sent: Tuesday, September 30, 2008 1:41 PM To: [EMAIL PROTECTED]; 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] HP105b Brooke: Thanks for the rapid response. I will have to take a picture to get it to you but it is 6 5/8" X 5 3/8" and thick enough to accommodate a type "c" cell. Also, just before I read your response, I received another indicating Batteries Plus will build an exact replacement for about $80.00. Not bad considering HP wanted my right arm and subservience of my first grandchild for life! Thanks for your courtesy and would appreciate hearing about your alternatives. Bill W5STP -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brooke Clarke Sent: Tuesday, September 30, 2008 1:14 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP105b Hi Bill: There may be some very reasonably priced alternatives. Can you send me a photo of the pack? Have Fun, Brooke Clarke, N6GCE http://www.prc68.com/P/Prod.html Products I make and sell http://www.prc68.com/Alpha.shtml All my web pages listed based on html name http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Web Cam [EMAIL PROTECTED] wrote: > Hi: > > > > This is my first email on time-nuts. I have an HP105b and would like to > know where I might obtain > > new battery pack. > > > > Bill > > W5STP > > _______________________________________________ > 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.
105B Battery Pack.pdf
Description: Adobe PDF document
_______________________________________________ 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.