[time-nuts] broadband MPX signal stereo

[ehydra]

Demian Martin schrieb:
> I have tested a number of soundcards and while the EMU 2020 has issues
> (serious jitter and noise from the USB interface) I can recommend the ESI
> Juli@ as having flat response and good SNR up to 90 KHz. It's a PCI card, no
> USB. I have measured the performance of FM MPX adapters and tested FM
> Transmitter performance with one. You get 24 bit at 192 X 2 continuously as
> long as you want. With some simple pre-filtering and gain you should be able
> to get some 60 KHz signal at very low levels. With a deep FFT I get to -130
> dBFS easily. With the demo board for the AKM AK5345a I am getting better
> than -160dBFS. That has SPDIF out. Depending on the filter selection, most
> chips have a flat option, there is no significant phase shift up to
> frequencies close to the cutoff.

Interesting. From time to time I consider to make my own card.

Where can I find this demo card you mentioned?


> 
> I have tried and dumped a number of other sound cards that were dead ends.
> The ESI Juli@ is usually around $120. 

As far as I heard the ESI is a little better than the EMU0202.

- Henry


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