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

2019-07-12 Thread Jim Brown
I'm talking about feeding detected audio to the computer for decoding. And not all digital formats are the same -- going from one to another takes time and processor power, and, depending on how data is encoded, may be problematic. 73, Jim K9YC On 7/12/2019 12:49 PM, Andy Durbin wrote: "The

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

2019-07-12 Thread 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

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

2019-07-12 Thread Jim Brown
To put this in context, WSJT-X works at 16-bit 48 kHz. The spec that matters is the linearity of the A/D at the extremes of the dynamic range. 73, Jim K9YC On 7/12/2019 8:02 AM, Andy Durbin wrote: "It was interesting to see that the shared data sheet shows even the latest version of the

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

2019-07-12 Thread Andy Durbin
"It was interesting to see that the shared data sheet shows even the latest version of the PCM2903 is not recommended for new designs" Well, the PCM2903C seems to be the latest version of the PCM2903 and it does not have the NRND designation. The PCM2901 datasheet reference to PCM2903E is

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

2019-07-12 Thread Andy Durbin
"The TI PCM2901, I am told by a Watsonville rep, was used in the K3-S." Thanks. The PCM2901 and PCM2903 appear to be be very similar. The only obvious difference I found is in support of S/PDIF. It was interesting to see that the shared data sheet shows even the latest version of the PCM2903

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

2019-07-12 Thread Mark Murray via Elecraft
Andy: In answer to your two questions: The TI PCM2901, I am told by a Watsonville rep, was used in the K3-S. Whether it was used in early production runs, or used in later production runs, I do not know. It comes in two versions: Model E and Model EG4. The data sheet and other specs can be

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

2019-07-10 Thread Andy Durbin
"Perhaps it will be the same as the carefully chosen TI chip used in the K3-S" What is the part number of that carefully chosen TI chip? Various versions of the PCM2903 are used in amateur radio equipment. Did Elecraft use something better in the K3S? 73, Andy, k3wyc

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

2019-07-10 Thread Mark Murray via Elecraft
If available at this early stage, any specs on the upcoming K4 sound card, or likewise, its internal chip model number, would be of interest here. Perhaps it will be the same as the carefully chosen TI chip used in the K3-S. Thank you.