[time-nuts] Commercial software defined radio for clock metrology

[Bob Camp]

HI

It’s been a while since I dug into a TimePod. Doesn’t it have two dual ADC’s in it? You can select which 
way you route the signals into the ADEV process.

Bob


> On May 28, 2016, at 11:04 AM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> 
> One can just measure the TDEV performance.I can measure the TDEV performance at 10MHz later today if that's useful.It should be somewhat similar to the single channel SDR instrument given there is no cancellation of most of the internal ADC clock conditioning system noise.
> Bruce
> 
> 
>    On Sunday, 29 May 2016 2:04 AM, Attila Kinali <attila at kinali.ch> wrote:
> 
> 
> On Sat, 28 May 2016 08:47:45 +0000 (UTC)
> Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> 
>> This SDR setup appears to have a higher PN (at least 2 ADC's per signal
>> are required  to achieve lower PN ) than a Timepod, however it appears
>> to be better at measuring ADEV than a Timepod.
> 
> Yes, the spec'ed SNR of the ADS62P44 is 74dBFS (typ) while the LTC2216
> is spec'ed with 81dBFS (typ). Additionally, the input amplitudes in
> Sherman and Jördens experiments were kept around half scale, which is
> another -6dB in SNR. There is another ~15dB in difference, but I currently
> don't see where it comes from.
> 
> 
> What I wonder is, what the TDEV performance of the TimePod is, given
> that it uses single channel ADCs. Unfortunately, there is nothing in the spec.
> 
> Guestimating from the ADEV specs, it looks like that the TimePod has about
> the performance of the single channel setup. Which approximately makes sense.
> 
>             Attila Kinali
> 
> -- 
> Reading can seriously damage your ignorance.
>         -- unknown
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