Seannon AG0NY , The FCC rules regarding 60 Meter channelized operation require that all of the components of upper sideband voice transmissions remain within the defined channel.
60 Meter Channel 3, (5357 KHz) is used for FT8 operation in the States and a number of other countries. The center frequency for that channel is 5358.5 KHz. A normal Upper Sideband , passing through a transmitter’s TX filter will pass audio signals between 200 and 2800 Hz. With a user’s VFO set to 5357 KHz, audio components of a USB signal will occupy between 5357.2 and 5360 KHz. A 50 Hz wide FT8 signal, using the same VFO setting and a tone between 200 Hz and 2750 Hz, will also remain within that channel. A Pactor signal will occupy between 5357 and 5359.4 KHz, a whole lot more than a 50 Hz FT8 signal. Expecting all FT8 signals to transmit exactly 1500 Hz, no more, no less, above the 5357 KHz is ridiculous. It simple won’t happen. I don’t know of any FCC actions on any complaints of FT8 interference to any other services occupying the 60 Meter FT8 frequency of 5357 KHz. 73, Rich – K1HTV AG0NY wrote: >> > >> > 9. Under the existing rules, only upper sideband voice transmissions >> are permitted in the 60 meter band. In the NPRM, the Commission proposed to >> authorize the use of three additional emission designators in the band: CW >> emission 150HA1A, which is Morse telegraphy by means of on-off keying, and >> data emissions 2K80J2D and 60H0J2B. In § 97.307(f)(14)(i) of the proposed >> rules, the Commission restricts emission designator 2K80J2D to data using >> PACTOR-III technique and emission designator 60H0J2B to data using PSK31 >> technique. The Commission also sought comment on whether amateur stations >> could be permitted to transmit emission types in addition to those >> requested by ARRL in the 60 meter band without increasing the likelihood of >> interference to primary users.
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