[time-nuts] Datum Frequency Counter

d0ct0r time at patoka.org
Mon Feb 17 22:52:50 EST 2014



Hello Netizens !


Recently I obtain the "GPS FC" device. Its exactly as shown on the 
picture from the datasheet:

http://www.gigatest.net/datum/gps-fc-e.pdf

Now I try to test it. As far as I understood (in accordance with its 
specs.), it shold generate the 10Mhz signal as its locked to Satelites. 
I connected it through frequency divider (by 64) to my PC-based 
oscilloscope (yes, I know, I know, its not for "nuts").
I did preliminary tests with this divider with my T-Bolt and standalone 
DATUM OCXDO to make sure its working (see attached files). But that GPS 
FC still shows only some noise. In the datasheet, manufacturer mentioned 
about so-called "test board". Does anybody knows what is this board 
exactly ? For now I just connected power through the 1 MilliHenry coil 
and try to get signal from it through the divider which has 0.2nF 
capacitor in its input to eliminate DC).

-- 
WBW,

V.P.
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