Long duration flights frequently must use high frequency custom built transmitters and slow data protocols such as RTTY, Hellschreiber, Morse code and PSK31, to transmit data over great distances using little battery power.
It also carried a PSK31 Linear/FM Satellite translator accepting 3 kHz SSB channel in the 10 meter band at 29.4 MHz and repeating that in baseband on a VHF or UHF narrow-band FM downlink.
When used in conjunction with appropriate software, it allows the operator to transmit and receive using many digital modes, including packet, PSK31, and RTTY.
PSK31 |
Fldigi, Amateur radio software that allows data transmission and text chat via digital modes such as PSK31.