Gary -
The Datum 9520 series are Time Code Displays (discontinued).
They have been appearing via government and military surplus via obsolescence
sales.
In addition to the 6-digit time display of the 9520 series, this specific model
(-1000) includes the 3-digit Day of Year (DoY).
I believe that all of the 9520 series support the Amplitude modulated carrier
(IRIG B) timecode.
Datum 9520-240 manual
http://www.arsitec.com.br/arquivos/produtos/9520-240-manualF.pdf
Datum 9520-647 manual
ftp://50-199-14-216-static.hfc.comcastbusiness.net/electronics/testgear/time-freq/symmetricom/9520/9520-647-manual.pdf
Since this Datum 9520 is discontinued, ITS (California) provides modern
replacements, especially for F-16 fighter aircraft (9520-647 version).
http://www.itsamerica.com/Files/tcdisp.htm
greg
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