[time-nuts] Using cheap sound cards for measurements

[Lux, Jim (337C)]

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Bruce Griffiths
> 
> If the 2 signals are sampled at different times then there is
> incomplete
> cancellation of the phase noise of the offset oscillator.
> This effect increases with the delay between the 2 samples.
> In practice the interchannel sampling delay can be relatively long
> (hundreds of microsec) with a low noise offset oscillator.


Since the lowest sample rate contemplated (except for my $25 DATAQ) is 44 kHz, that's 20-25 microseconds maximum offset, even if you use different digitizers, once you've figured out the alignment (which you could do with a single sync pulse fed to all channels)