[time-nuts] HP105b

[J. L. Trantham]

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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bill
Sent: Tuesday, September 30, 2008 1:41 PM
To: brooke at pacific.net; '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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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

phase3 at wcc.net 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
> 
> _______________________________________________
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