[time-nuts] VP oncore question

[Randy Warner]

Morris,

The easiest thing is to connect a jumper from Pin 1 of the 10-pin header to
one of the holes used to previously mount the battery. I would suggest
putting a resistor (1-4.7K is fine) and diode in the middle of this wire to
limit current in case of any mistakes and prevent any possibility of the
onboard charger from damaging your external battery. A couple of standard
alkaline AAA cells will keep the VP backed up for MANY years.

There are quite a few rechargeable LiOn coin cells that will fit on the
board also, but it is just about impossible to find the cell Motorola used
with the welded pins. Just about any rechargeable LiOn cell you can find
will fit, you'll just need to hardwire from the legs on the battery to the
holes in the VP board.

Randy Warner
____________________________________________________________

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Morris Odell
Sent: Friday, December 28, 2007 11:24 PM
To: time-nuts at febo.com
Subject: [time-nuts] VP oncore question



Hi all,

This is my first post although I have been reading this list for quite a 
while. I am an Aussie time nut with both a HP Z3815A and a Shera-ised 5061A 
ticking away in my basement,

I have a question about the venerable VP Oncore receiver. I have obtained a 
few of these very cheaply and want to put them to use. Originally they all 
had the on-board rechargeable battery option but the batteries are long 
gone. These receivers have the battery pin on the connector disconnected to 
avoid problems with non rechargeable batteries connected to the on-board 
charger. Is it possible to rework the board to allow the use of an external 
non-rechargeable backup battery, or if not, where can I find a suitable 
tabbed 3 volt rechargeable Li button cell to install on the board?

Any help greatly appreciated

Morris Odell VK3DOC
Melbourne, Australia 


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