| Balon PYSY wystartował.. może doleci do nas? |
| http://www.pirnay.com/index.php/en/en-home-2/blog-en/190-pysy-8-launch-on-may-3rd-2014 o częstotliwości: "..Now it is time to describe some specifics of the PYSYpi tracker. As described previously, there are 2 transmitters: one at 434.450 MHz transmitting the usual telemetry string using theDominoEX16 modulation. A second transmitter at 434.550 MHz (standard 300 baud RTTY with a shift of 600 Hz) sends SSDV packets containing pictures from the piCam interleaved with 300 baud RTTY telemetry data. The telemetry data packets are transmitted once directly in plain text and in addition in a condensed scheme with parity bits from a reed solomon forward error correction algorithm. ..." |