On 15 December 2006, a new USA FCC rule goes into effect; the following common ham digital modes <500Hz bandwidth, will be allowed for transmitting a photo or image, in the data subbands:
MODE / EMISSION DESIGNATOR RTTY = F1C MFSK = F1C PACTOR = F1C PACKET = F1C FSK31 = F1C FMHELL = F1C 73---Bonnie Crystal KQ6XA .
