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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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.
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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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well that gets to the next part, still a little complicated for twitter, or I haven't distilled it down to simple enough concepts to explain in tweets yet because my understanding is incomplete. coming soon.
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I would check schematics for long bus traces from HDA_SDOUT, other ICH10 trivia: the internal oscillator frequency is very sensitive to VccRTC variation.
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Your original tweet is still nonsense because the numbers you ran are wrong and the field you found has nothing to do with the clock, it's just about framing. It's a 24MHz serial link. Period. You don't need to misinterpret errata documents for that. Read the damn HDA spec.
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also pcie IS as 2.5ghz sdr, but it has poor control of the signal contents and lacks streaming fifos HD audio has.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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