3 ms·

2.4 GHz Only I believe that's a hardware limitation of the radio, which software won't be able to change.

walrus01 2y ago
Even the much newer first generation PS4 from 2013/2014 is a 2.4 GHz only wifi device. It's exceedingly unlikely to find something from the time of the psp in 2003/2004 that has 802.11a 5GHz and isn't a business laptop.
- nicman23 2y ago
  huh 5ghz existed since 1999
  - walrus01 2y ago
    Yeah, but certainly wasn't common until 802.11n 5GHz stuff shipped and became in common consumer use. The target market for a psp would have had 802.11b or .g 2.4 GHz only home routers/APs. Think Linksys wrt54g and similar.
    - felixg3 2y ago
      Yes and even plenty of 802.11n devices were 2.4Ghz only.
  - throwaway173738 2y ago
    It was actually the first band that wifi supported.
    - walrus01 2y ago
      It was not, 802.11 (no letters) and 802.11b were 2.4GHz. the 802.11a standard came later.
  - washadjeffmad 2y ago
    We had a fleet of PCMCIA cards for wardriving in the early 2000s, but only one for 802.11a. It was rare to find, but the networks were left weirdly open, presumably because it was rare, limited range, and they didn't care to troubleshoot security on top of connectivity.
Aachen 2y ago
Not with that attitude you can't. Simply overclock the CPU to 5 GHz and connect an antenna to pin 8! (This comment was inspired by this actually functional crazy project: https://web.archive.org/web/20220104163626/http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter https://web.archive.org/web/20220104163626/http://www.icrobo... | HN discussions: https://hn.algolia.com/?q=Pi+fm https://hn.algolia.com/?q=Pi+fm)
- xg15 2y ago
  This is amazing! Saved.
- mschuster91 2y ago
  Ham here. This is _nuts_, thanks. I wonder what a RPi 2040 could accomplish with its dedicated realtime components. Add a variable (center frequency and bandwidth) bandpass circuitry to filter out nasty harmonics and I'd guess you can at least go for purely software transmitting CW (morse code), FM and the various digital modes like DMR that are AFAIK all variations of either straight FM or FSK. FPGAs are too expensive / require too niche knowledge to pull it off, and regular GPIOs suffer from hardware interrupts... The other question of course is how to receive, but I guess for that you can use an RTL-SDR...
noname120 2y ago
I wonder if the Marvell Libertas 88W8010 chip could be replaced with one from the same family but with 5 GHz support. That would require additional patches but probably not a whole rewrite.

Even the much newer first generation PS4 from 2013/2014 is a 2.4 GHz only wifi device. It's exceedingly unlikely to find something from the time of the psp in 2003/2004 that has 802.11a 5GHz and isn't a business laptop.

nicman23 2y ago
huh 5ghz existed since 1999
- walrus01 2y ago
  Yeah, but certainly wasn't common until 802.11n 5GHz stuff shipped and became in common consumer use. The target market for a psp would have had 802.11b or .g 2.4 GHz only home routers/APs. Think Linksys wrt54g and similar.
  - felixg3 2y ago
    Yes and even plenty of 802.11n devices were 2.4Ghz only.
- throwaway173738 2y ago
  It was actually the first band that wifi supported.
  - walrus01 2y ago
    It was not, 802.11 (no letters) and 802.11b were 2.4GHz. the 802.11a standard came later.
- washadjeffmad 2y ago
  We had a fleet of PCMCIA cards for wardriving in the early 2000s, but only one for 802.11a. It was rare to find, but the networks were left weirdly open, presumably because it was rare, limited range, and they didn't care to troubleshoot security on top of connectivity.

Aachen 2y ago

Not with that attitude you can't. Simply overclock the CPU to 5 GHz and connect an antenna to pin 8! (This comment was inspired by this actually functional crazy project: https://web.archive.org/web/20220104163626/http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter https://web.archive.org/web/20220104163626/http://www.icrobo... | HN discussions: https://hn.algolia.com/?q=Pi+fm https://hn.algolia.com/?q=Pi+fm)

xg15 2y ago
This is amazing! Saved.
mschuster91 2y ago
Ham here. This is _nuts_, thanks. I wonder what a RPi 2040 could accomplish with its dedicated realtime components. Add a variable (center frequency and bandwidth) bandpass circuitry to filter out nasty harmonics and I'd guess you can at least go for purely software transmitting CW (morse code), FM and the various digital modes like DMR that are AFAIK all variations of either straight FM or FSK. FPGAs are too expensive / require too niche knowledge to pull it off, and regular GPIOs suffer from hardware interrupts... The other question of course is how to receive, but I guess for that you can use an RTL-SDR...

noname120 2y ago

I wonder if the Marvell Libertas 88W8010 chip could be replaced with one from the same family but with 5 GHz support. That would require additional patches but probably not a whole rewrite.