[time-nuts] Sound cards
John Ackermann N8UR
jra at febo.com
Fri Jan 9 13:37:47 UTC 2009
Rex said the following on 01/09/2009 06:37 AM:
> Maybe I lost track and missed something, but I don't think I ever saw
> more on the subject of specific high-end sound cards that might be
> useful for nutty measurements.
>
> I'd be interested to hear what any of the group has to share about
> relative merits of current sound cards that can be interfaced for
> measurements like what was being discussed in that earlier thread. (And
> some before and since.)
>
> From my own point of view, I'd most like to hear about any that are
> external -- connected by USB or 1394, rather than an internal card. This
> makes it more portable and easier to move between different PC's.
[Shameless Plug]
One very interesting possibility is the HPSDR (High Performance Software
Defined Radio) boards called Ozy and Janus. Together with a passive
backplane called Atlas, they provide an extremely high performance
ADC/DAC that supports sampling to 192k and output via USB. The system
was designed for use as the interface between a PC and an SDR and
special attention was paid to low noise and flat frequency response. I
am not certain, but I *think* that the inputs are DC coupled.
The two boards, assembled and tested, run about $320, with a discount
for TAPR members. The backplane is a fairly simple kit (lots of
connector pins to solder, but not much complexity) that sells for $28,
also with a discount for TAPR members. Bare boards, but not kits, for
Ozy and Janus are also available for the adventurous.
I'm not aware of anyone using this system for T&F work, but it has some
interesting possibilities.
[/Shameless Plug]
John
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