Comment by subscribed
7 days ago
LOL, no. You can't even hear a ok quality music further than 20 metres away. Class 2 devices (smartphones) have maximum theoretical range of 30 metres with 2.4mW (4dBm).
Sena or Cardo work in 2.4 Ghz (ISM) range as well, but as a class 1 devices, which with 100mW (20 dBm), they can allow for maximum range in excess of 1 mile.
I'd use Walkie - talkies (PMR 446 MHz, about half of a mile of the range in the town) before resorting to the smartphone bluetooth. Likely only feasible on the parking.
Smartphone bluetooth is fine for two bicycles but it does NOT compete with a purpose-built hardware, especially not with the top makers like Cardo or Sena, LOL.
Bluetooth LE which most smartphones support today is quite a bit different from Bluetooth classic. It typically runs at 1 or 2 Mbps and can trade bandwidth for error correction to get some impressive range. For example, this guy got 1.6 miles at 8dbm transmission power. https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/pos...
The audio codec on ble is more modern too.
> “You can't even hear a ok quality music further than 20 metres away” That smells like the SBC codec running on Bluetooth classic to me. Very different tech.