[Elecraft] K4 Sound Card, used for Weak Signal Digital Modes.

[Andy Durbin]

"The spec that matters is the linearity of the A/D at the extremes of the dynamic range."

Jim,

A bit more information please.  Are you talking about TX or RX?  Are you talking about the A/D that is typically in the TX path between the CODEC and DSP of a modern transceiver or perhaps an A/D that may be used in an outboard analog sound interface?

Why wouldn't a smart new rig accept USB audio and feed it directly to DSP rather than converting to analog and back to digital before reaching the DSP.

73,
Andy, k3wyc