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 …
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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
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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.
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But you can't *receive* RF, and you certainly can't transmit with any kind of significant power, because it's a design objective to minimize RF emissions. Not without an external antenna and amplifier.
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