[hpsdr] Dumb question - HPSDR sound card

[George Medakovich]

There was a "Simple Software Radio Peripheral" project for Gnu Radio
as a low cost alternative to the USRP that was offered as a $100 board
and used a USB 2.0 interface daughter board from Bulgaria: http://oscar.dcarr.org/ssrp/
It uses an LTC1746.

George Medakovich, ke5dng

Philip Covington wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> On 4/4/07, J.D. Bakker <jdb at lartmaker.nl> wrote:
> 
>>***** High Performance Software Defined Radio Discussion List *****
>>
>>
>>>How difficult would it be to take the A/D & D/A and interface them to an
>>>FPGA or other USB/firewire interface, all on a single, low-cost board?  For
>>>those not interested in spending over $350 for Atlas, Janus, Ozy (or
>>>expensive commercial USB/firewire solutions), this one-board solution would
>>>be attractive.  I think it would need to cost less than $100.
>>
>>USB audio is non-trivial for rates other than 16bit/44k1. I would
>>personally suggest using a SPDIF/AES digital audio interface, thus
>>allowing an optical interface to a budget sound card. The major
>>advantage is that this offers direct software compatibility with
>>existing SDR applications, while the ADC/DAC can be better than
>>conventional sound cards (and closer to the mast, if desired).
> 
> 
> Sounds interesting.  I'll have to do some more reading on SPDIF/AES.
> 
> 
>>Single chip solutions are available to connect ADC/DAC chips directly
>>to electrical/optical S/PDIF links. I would be willing to do an open
>>design based on the AK converter used in Janus, with audio
>>in->electrical/optical out. My main stumbling block is that I have no
>>source for the AK chips in proto quantities. If only someone could
>>sell me some / point me to a distributor who's willing to sell a
>>dozen or so to Europe...
> 
> 
> The AKM parts are horrible to get in small quantities - I originally
> was pushing the TI PCM4202 for a possible ADC for JANUS until the AK
> chip outperformed it at 192 kHz in Phil H's testing.  The PCM4202 is
> good at 96 and 48 kHz.
> 
> 
>>JDB.
>>[Plan B is the new TI PCM4222 converter, but that one's so fresh it
>>isn't even in sampling yet]
> 
> 
> I've been keeping an eye on the PCM4222 also.  Maybe it will be
> available by the end of the year?
> 
> 73 Phil N8VB
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at hpsdr.org
> Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
> HPSDR web page: http://hpsdr.org
> Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/
> 
> 


 1175712554.0