[time-nuts] Timing Health Monitoring

[Chris Albertson]

Of course the dual trace scope will do this. But the OP asks for
something cheaper.   I think you can do the same thing as the scope
with a mixer.  "Mix" the reference and "unknown" 10Mhz signals then
use a low pass filter.  The output is the "beat" which if everything
is perfect is a DC voltage.  But in a real world is a slow moving AC
signal.   Then visually you can drive an analog volt meter and watch
the needle move to not move.   You can build a diode ring mixer for
cheap or buy an SA612 chip for a few bucks



On Tue, Jul 17, 2012 at 9:18 AM, Azelio Boriani
<azelio.boriani at screen.it> wrote:
> The first step is: use any dual trace oscilloscope and put on channel 1 the
> first 10MHz source and on channel 2 the other. Trigger from channel 1 and
> see if and at what speed (cycles/second) the other channel walks.
>
> On Tue, Jul 17, 2012 at 6:09 PM, Chris Hoffman, KG6O <cq.kg6o at gmail.com>wrote:
>
>> What advice does anyone have on building/finding cheap [visual?]
>> comparison devices to display or detect a timing [lesajo?] from my 10MHz
>> sine wave ports?
>>
>> Further, what timing/health metrics could/should I be aware of and/or
>> looking for?
>>
>> I do not want to spend good money on another oscillicope if I can help it,
>> but I do want to see, or at least be remotely  aware of clock slips/walks
>> and other anomalies. I am thinking about building an embedded system to
>> automate monitoring, configuration, and alerts... perhaps using an Arduino.
>>
>> -CH
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-- 

Chris Albertson
Redondo Beach, California