Hector Martin

Buried in Intel ICH10 Errata update: HD audio “oversampling” setting in all Intel chipsets to use for SDR, Tx up to 2.3Mhz (48bit@48Khz), Rx to 4.6 Mhz (96b). Even without tuned antenna has range to cover LF and MF incl.160m (1.8-2.2) amateur band! https://www.intel.ca/content/dam/www/public/us/en/documents/specification-updates/io-controller-hub-10-family-specification-update.pdf …

I have to admit RF is not my strong suit, but doesn't this require an amplification stage before it's useful? Also assuming most products with this chipset would be shielded to pass FCC type certification.

He's talking about a freaking digital multichannel link. The ICH doesn't even do A/D or D/A conversion, that's up to the external codec. It's all nonsense.

uh things like the raspi dispensed with the dac and just output the pwm. again. it's easy to say impossible, doing the impossible requires a little more work. most of the time fooks scream impossible, it turns out to be a little possible.

Yes and people have turned video card VGA outputs into radio broadcasting systems. What you found in the datasheet still has *nothing* to do with any of this because it's a datasheet for a digital packet link. You might as well claim PCIe is a 2.5GHz SDR because it runs at 5Gbaud

I'm not screaming "it's impossible to broadcast RF" from a computer. Of *course* it's possible. That's what EMI *is*. That's how TEMPEST works. You can abuse interfaces for that. That doesn't change the fact that your interpretation of what you found is nonsense.

I would check schematics for long bus traces from HDA_SDOUT, other ICH10 trivia: the internal oscillator frequency is very sensitive to VccRTC variation.