[time-nuts] oscillator choice question

Niels Lueddecke idkfa at abwesend.de
Sun May 2 18:44:48 UTC 2010

Don't do it, it may drag you deep into nut territory...

All i wanted was a clock based on a cheap LPro rubidium.
Next thing i knew were strange things piling up on my desk.
Now theres a custom power supply, 7 AVRs on a couple of boards,
an FPGA running a 1GHz counter, a lump of metal and some rather
nice blinkenlights.

Does anybody else have an atomic clock with ir remote control,
a gregorian calendar (1582-29999), full leap year support,
all official holydays incl. easter date calculation, alarm mode
with snooze and 4 bit snooze period counter that is shifted out
in a kind of frequency modulation, a temp controlled fan for the
LPro, external c-field adjustment via d/a converter, pc interface
and software for logging, time setting and main avr memory dumps,
it even knows (quite acurately) how many ns its off the gps 1pps.

Did i mention the alarm can be set to only ring on days i have to work?
And it ain't even finished yet.

You see? Don't do it, don't even think about starting.
Go buy a trimble thunderbolt, it will save you LOTS of time!


-------- Original-Nachricht --------
> Datum: Sat, 01 May 2010 14:28:04 -0500
> Von: "chris at yipyap.com" <chris at yipyap.com>
> An: time-nuts at febo.com
> Betreff: [time-nuts] oscillator choice question

> I'd like to build a GPS disciplined frequency standard.
> I am slowly gathering up pieces.
> I have a Trimble Resolution T GPS card that appears to work,
> and an antenna for it.
> I'm thinking now of the oscillator part.
> I have two Racal 1992 counters with the stable oscillator option 
> (probably 04E since these are former military units).  I also have an 
> old Schomandl  ND-100M Frequenzdecade signal source with an  (I assume) 
> ovenized oscillator w/unknown properties.
> I'm wondering if I could use an oscillator from one of these
> gizmos instead of shelling out real money on ebay?  Speaking of
> which, it seems like half the people in China are selling oscillators.
> I assume some of them are good for this application and some not
> so good?  The usual suspects from HP and Agilent are there, and
> they seem to command a pretty good (high) price.  Which is why
> I'm eyeing the Schomandl.
> Chris
> w0ep
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