Hi Jeremy:
It's a very bad idea to put any battery with acid in an enclosure that has electronics since if it vents the acid will
etch the PCBs.
Guess how I learned this. I got a great price on a Gibbs Frequency Standard
because the oven no longer worked.
http://prc68.com/I/office_equip.html
Modern Ni-Cad batteries have much more capacity than older ones and no longer have a memory effect. They are also very
easy to charge, so why not just replace the old cells?
--
Have Fun,
Brooke Clarke, N6GCE
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.
-------- Original Message --------
I recently acquired a nice HP-105B, serial prefix 1240A, and like Perry Sandeen (posted here 10 May 2016) was
pleasantly surprised to find a 10811-type oscillator inside in place of the old blue oven. Well, the oscillator isn't
actually labelled "10811" but has a label "Serial No. 3010A62646 / Hewlett Packard / Made in U.S.A. / R11 147K." So,
this is essentially the same oscillator as Perry found in his 105B.
The oscillator works well although the meter reading for the 5 MHz output is low, about 30 instead of the expected 80
(per the 105B manual for the 1240A series). The measured output is also low, about 1 Volt where 1.5 Volt is the
expected minimum. Might this be due to the change from the old 105 crystal oven to the 10811?
What is the received wisdom on replacement of the previously-removed factory Ni-Cad pack? There are many small 12 Volt
batteries available, two of which would easily fit into the space available and some of which might not even catch
fire! Other options are an external battery+charger or even a UPS on the AC line. Opinions?
Jeremy / N6WFO
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