PSK-31-FEC is a narrow-band amateur mode developed by F6CTE. The aim of this experimental slow mode is to allow “chat” communication between hams with much less errors than with PSK-31.
|
Parameter |
Value |
|
Frequency range |
HF |
|
Operation modes |
Simplex FEC |
|
Modulation |
DBPSK |
|
Symbol rate |
31.25 Hz |
|
Receiver settings |
DATA, CW, LSB or USB |
|
Input format(s) |
AF, IF |
|
Additional Info |
3.580 MHz, 7.035 MHz, 14.070 MHz |
The baud rate is fixed at 31.25 Bd. The speed of transmission is about 30 words per minute compared to CW.
Each bit is repeated 13 bits later for forward error correction using the same principle as used in AMTOR FEC or PSK-AM, except that this type of FEC is bit related instead of character related.
To separate the transferred characters, a “011” sequence is inserted between each character guaranteeing separation as long as this sequence does not appear in the character itself.
PSK-31-FEC uses the same varicode alphabet as PSK-10 having a maximum length of seven bits per character.