[Elecraft] K3 and USB Audio Codec

[Leigh L. Klotz Jr WA5ZNU]

Kok Chen wrote:
> 
> One good connection that I have come across is S/PDIF that is  
> available on the Icom IC-7800.  It allows a connection between the  
> radio and the computer that is completely non-galvanic.   No ground  
> loops, no RFI, down to -144 dB.
> 
> S/PDIF provides an audio path with up to 20 bits of resolution (about  
> 120 dB, with 1 bit being 6.02 dB), with 24 bits being an option by  
> using the extra 4 steering bits as data.
> 
> The standard sampling rate for S/PDIF is 48,000 samples per second  
> stereo, which would support almost 50 kHz of bandwidth on an baseband  
> I/Q channel.  S/PDIF provides up to about 30 feet separation between  
> equipment.
> 


I built an amplitude-modulated IR fiber link using cheap parts and got poor
results due to fluorescent light leakage into the jacketed cables.  

I've tried hard to find available chipsets for S/P DIF but come up short.  A
well-shielded box or internal optical connection for radio would be a nice
thing to have for ham equipment.

Leigh/WA5ZNU

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