[time-nuts] Datum OT-20 "Office Time"
paulswedb at gmail.com
Tue Feb 15 20:29:00 UTC 2011
Great find you have. I will guess it locked to some celsite. But surprised
at what it states its accuracy is.
On Tue, Feb 15, 2011 at 1:18 PM, Arthur Dent <golgarfrincham at yahoo.com>wrote:
> Here is a little more info on the OT-20.
> I connected my OT-20 to a cell antenna and a
> 48VDC power supply and let the unit warm up.
> I used a terminal emulator set to 9600 8N1 to
> talk to the unit. The link below is the response
> of the OT-20 to various commands I sent to it.
> Press "shift ?" on your terminal emulator to
> have the unit send you the list of accepted
> After warming up and locking to the CDMA signal,
> most of the alarm LEDs went out. The one that
> stayed on indicated that there was only one
> 48VDC supply connected and that is considered
> a minor alarm condition. Jumpering the 2 inputs
> will eliminate this alarm. The output BNC on my
> unit puts out a 10Mhz sine wave. There is also a
> DS1620D1 chip in the OT-20 to report the temper-
> ature and probably aid in keeping the output closer
> to the 10Mhz during periods of holdover
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