[time-nuts] Datum OT-20 "Office Time"

[Pete Lancashire]

thanks ! now to find a CDMA antenna. My call the one that went with the unit
is long gone still attached to the building or in the bottom of the BIG metal
recycle bin.

-pete

On Tue, Feb 15, 2011 at 10:18 AM, 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
> commands.
>
> 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
>
> http://farm6.static.flickr.com/5134/5448082945_13798a2669_b.jpg
>
> -Arthur
>
>
>
>
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