[time-nuts] Questions on Nortel Trimble NTBW50AA GPSTM

Bob Camp kb8tq at n1k.org
Wed Aug 10 17:59:57 EDT 2016


You can get a very good industrial 24V supply for < $40 (and maybe < $20) brand 
new from distribution. Comes with a 3 year warranty and has all the various protection 
things you would want on a supply. My claim is that you will always have 12V, 24V 
and 48V “stuff” running around. Having a bulk supply for each makes things a lot easier. 


> On Aug 10, 2016, at 3:25 PM, Clay Autery <cautery at montac.com> wrote:
> 1) Need a 24 VDC power supply.  Am considering just buying an Astron
> VLS-35M Adjustable Voltage/Current supply (5-32V/1.5A to limit) since I
> don't own a variable power supply yet, this is a linear, and the same
> size package as my RS-70M.  I can worry about a dedicated supply later
> if I decide to keep this GPSTM after I finish modding/testing it.
> Anyone have any recommendations to the contrary?  Why?
> 2) Need to bring the PPS out from the TP in this article: 
> https://www.i3detroit.org/wiki/Nortel_GPSTM  The article shows a buffer
> circuit being used to accomplish this...  Need help locating a datasheet
> on the Motorola chip used...  It's obsolete and I need to find a pin
> compatible replacement...
> Or, I need to find another buffer schematic/plan,
> Or, alternatively....  has anyone ever tried pulling the 1pps out and
> hooking it to the 9.8 MHz driver (severing the drive line to it and
> jumpering in the 1pps)?  The 9.8MHz and the 10MHz signal out ports SEEM
> to use identical driver/buffer circuits on this board...  Seems like a
> possibility...
> Preferably, I find the Motorola chip, copy the buffer circuit and move
> on... 
> I'm pretty new at this, so any help is appreciated, and not slapping me
> about for "not knowing" stuff is greatly appreciated!  :)
> Sincerely,
> -- 
> ______________________
> Clay Autery, KY5G
> MONTAC Enterprises
> (318) 518-1389
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