8 lines
495 B
Plaintext
8 lines
495 B
Plaintext
FreeDV is a Digital Voice mode for HF radio. FreeDV allows any SSB radio
|
|
to be used for low bit rate digital voice. Speech is compressed down to
|
|
700-1600 bit/s then modulated onto a 1.25 kHz wide signal comprised of
|
|
16 QPSK carriers which is sent to the Mic input of a SSB radio. The signal
|
|
is received by an SSB radio, then demodulated and decoded by FreeDV. FreeDV
|
|
700(B) rivals SSB in it's low SNR performance. At high SNRs FreeDV 1600
|
|
sounds like FM, with no annoying analog HF radio noise.
|