Morris, It sounds like you have an earlier 5061A than mine. Mine has the LED clock but the battery charger is the same.
Option 03 is a combination of Option 01 (Time Standard) and 02 (Standby Power Supply). The NiCad battery is made up of 20 (I think 1/2 D cell) 1.2 V 2300 mAh NiCad cells. The charger circuit is somewhat unusual in that it re-charges based on time of use and not current flow. The 1/2 D cells at 2500 mAh are available for about $5 each. I had a local battery supply house make up a new pack for mine for right around $100, and it works fine. I just took him the old battery which he took apart, removed the old cells, installed new cells, spot welded tabs between cells, etc. So, if you still have the bracket and battery case, you can get it refilled. I do not know much about the ability to use the charger card with other batteries. My limited knowledge suggests that probably not. I think it will work ok if the replacement cells are similarly current rated to the originals. Mine has done well so far. You might want to look at the charger card for the 5061B. It charges based on current, not time of use, which is a more standard approach. My recollection is that the cards are interchangeable. I am sure others on the list can be much more helpful on this. If you decide not to use your battery and charger card, I would be interested in getting those if you are interested in selling. I do not know about Option H92 but I suspect that it is a 'remote monitoring' option. I have one that has Option H99 that is a remote monitoring option that has two circular connectors on the back panel in the bottom right corner as viewed from behind. There is a board mounted on top of the A17 board on the bottom of the unit with wires that connect to these two connectors and the A17 board. Mine has been nothing but a pain. I do not have a schematic of it but I found shorted capacitors and dead regulators and IC's. I replaced those, thought I had it working but it is dead again. I am hoping to find a schematic to aid in repair but the ultimate solution may be to remove it. You might want to look at the A17 board and compare the area in yours with the pictures in the manual. If you have an extra board (about 3/4 the length of the A17) on top of your A17 board, I bet it is the 'remote monitoring' option. I can send you some pictures of mine if that would help. I suspect that others on the list are much more knowledgeable on this as well. I suspect the lack of a 'door' on top means someone swapped top covers. You can probably find one of the correct type. Good luck with your unit. They are addicting. Joe -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Morris Odell Sent: Thursday, December 10, 2009 5:21 AM To: [email protected] Subject: [time-nuts] 5061A questions Hi all, I recently picked up another 5061A (my second now, I'm becoming a real Time-Nut :-). The tube seems to be OK, it started up nicely and has been working well for nearly a week. The Patek Phillipe clock ticks beautifully in sync with the first one which has a good tube too but runs most of the time from a Shera GPS controller built into the empty battery compartment. The time difference between the two has settled down to only a few nS up & down over the day. Unfortunately the counter I'm using, a 5345A, lacks the GPIB option so I can't record it. This one has two mods I'm not familiar with - No 03 and No H92. There's a red LED labelled "System Alarm" on the front panel between the "Continuous operation" lamp and the 5 MHz output jack. There's also a DB25 female connector on the back marked "J30 Alarm". It lacks the little door on the top cover to allow adjustment of the clock and time offset - very frustrating. There was a battery in it, disconnected and well past it's use-by date. The 20 NiCad cells have gone to the recycler. My questions are: What are those options? Can the battery charger be used with cells other than Nicads? Nicad cells are getting hard to find but there are plenty of NiMh cells around and also lead acid batteries. Is it worth setting up a battery? I have taken out the charger card temporarily. My first 5061A came without the card so I have no experience of this. Cheers to all, Morris _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
