[time-nuts] GPSDO Alternatives

Bob Camp lists at rtty.us
Fri Dec 7 12:17:52 UTC 2012


Hi

In this case it's very much a "you get what you pay for" sort of thing. You are indeed comparing an hourglass to a cesium standard.

Bob

On Dec 7, 2012, at 2:20 AM, "Don Latham" <djl at montana.com> wrote:

> Good thought, Bob. AD9548 $27, eval board a whopping $250, get a
> thunderbolt :-). The eval board has a lot of SMA's on it...
> Don L
> Bob Camp
>> Hi
>> 
>> If all you want is a "something" locked to a GPS:
>> 
>> Take the pps from the GPS and hook it to an AD9548. You probably will
>> need a 50 cent CPU to set up the registers.  No muss, no fuss,  nothing
>> to invent or design.
>> 
>> Weather it does what you need to do is an entirely different question.
>> Without a defined objective / need / performance goal this could go on
>> for a couple hundred years…..
>> 
>> Bob
>> 
>> On Dec 6, 2012, at 7:43 PM, Chris Albertson <albertson.chris at gmail.com>
>> wrote:
>> 
>>> What if the OCXO had a sine wave output and then you used the PPS
>>> leading
>>> edge to gate the sine wave to a sample and hold.  then the sample is
>>> measured by the Arduino's ADC?  I think(?) you get a 10-bit ADC or is
>>> it
>>> 8-bits.  The problem is the required speed of the sample and hold,
>>> maybe
>>> not easy to build
>>> --
>>> 
>>> Chris Albertson
>>> Redondo Beach, California
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>> 
>> 
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> 
> 
> -- 
> "Neither the voice of authority nor the weight of reason and argument
> are as significant as experiment, for thence comes quiet to the mind."
> De Erroribus Medicorum, R. Bacon, 13th century.
> "If you don't know what it is, don't poke it."
> Ghost in the Shell
> 
> 
> Dr. Don Latham AJ7LL
> Six Mile Systems LLP
> 17850 Six Mile Road
> POB 134
> Huson, MT, 59846
> VOX 406-626-4304
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> www.sixmilesystems.com
> 
> 
> 
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