[time-nuts] Using cheap sound cards for measurements

Don Latham djl at montana.com
Sun Aug 23 16:38:13 UTC 2009


Thanks, Demian. At least one of the SD radio programs uses an ASIO driver.
I do not know about the rest, or about the "leading" spectrum analysis
freebies that are out there.
Don

Demian Martin
> Be careful of the Emu/Creative stuff. They have always has resampling in
> their products in the past. This new generation doesn't but it still has
> an
> inline DSP to muck around with the bits. Also the Windows (and MAC) sound
> systems are notorious for resampling internally. This can be very hard to
> get around. You can use ASIO drivers to go around the internal engine if
> you
> write your app for that. The EMU 0202 isn't supported fully in Linux yet.
>
>
>
> Demian Martin
> PDS
>
>
> Ok, I have looked at a few USB cards and reviews. For SD radios, and as
> far
> as I can tell for time use, the Creative E-MU 0202 will do nicely, at a
> reasonable cost of $99.00.
> According to the company info, the E-MU 0404 might be synchronizable; it
> costs about $150. The plug-in card (takes two slots) equivalent to the
> 0404
> is apparently the E-MU 1212.
>
> It might be possible to modify the 0202 to provide an external clocking
> signal, at least to provide a more stable oscillator, I don't know. The
> 100
> ps jitter if true is satisfactory?
>
> Oh, the 1212 input amplifiers are DC coupled (!).
> I suggest, of course, that interested parties have a look at the website:
> http://us.creative.com/products/welcome.asp?category=237
>
> I'll probably be ordering an 0202 in the near future.
>
> Don Latham
>
>
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-- 
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com




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