[time-nuts] GPSDO Alternatives

[Don Latham]

I wonder if two hardware interrupts on the Arduino itself could not be
used for phase locking? There's also an ARM 80 MHz version of the
Arduino package that might be applied, admittedly at higher cost...
Don

Jim Lux
> On 12/5/12 12:06 AM, Bruce Griffiths wrote:
>> Hal Murray wrote:
>>> albertson.chris at gmail.com said:
>>>> What is the simplest phase detecter that could work?  I think only
>>>> that, and
>>>> then a duouble oven crystal from eBay, a GPS and and Arduido.
>>> You also need a good D2A to drive the EFC on the osc.
>>>
>>>
>> A synchronous filter of a suitably level translated (CMOS analog
>> switch
>> plus low noise reference) PWM output should work well.
>
> True.. but I think the OP was wanting something that doesn't require
> designing a circuit and building it.
>
> So what you really want is a high performance DAC on a Arduino shield,
> or, alternately, a high performance DAC on a cheap eval board that you
> can easily hook up to an Ardino type processor.
>
> This is a bit trickier..
> Lots of ADC stuff out there, not so much DAC stuff.
> http://embeddednewbie.blogspot.com/2011/02/review-of-arduino-dac-solutions.html
>
> seems to have a number of approaches.  Adafruit has a shield with a
> Microchip MCP4921 12 bit serial dac
>
> here's a 16 bit solution http://www.shaduzlabs.com/article-12.html but
> it's a "build it yourself" solution.
>
> If you're not size/mass/power constrained, you might be able to find an
> inexpensive used programmable power supply.  I do this using a Prologix
> controller driving Agilent E3646 power supplies.. Big, Expensive, etc.
> but it does work.
>
>>>> Yes the Aruino is expensive compared to a bare uP chip but using
>>>> one,
>>>> I thin
>>>> you could build a GPSDO without a PCB and the Arduino's USB
>>>> connection could
>>>> be usful for power and logging/control.
>>> I wouldn't want to power a GPSDO from USB.  It will get power cycled
>>> every
>>> time I need to work on the logging PC.  Besides, you only get 2.5
>>> watts.  The
>>> oven will probably take more than that during warm-up.
>>>
>>>
>> Bruce
>>
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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
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