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MFSK SSTV

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  • Sholto Fisher
    Just for information: I received this answer from Joe, N8FQ and Rick KV9U. Q: Is MFSK16 analog SSTV allowed on 30m in the US? A(1): Yes, as of December 15,
    Message 1 of 1 , Dec 1, 2007
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      Just for information:

      I received this answer from Joe, N8FQ and Rick KV9U.

      Q: Is MFSK16 analog SSTV allowed on 30m in the US?


      A(1): Yes, as of December 15, 2006. SSTV/FAX with less than 500 Hz bandwidth
      is legal anywhere digital text is.


      A(2): Yes, thanks to Mark, N5RFX, who petitioned the FCC last year, the
      decision was made to allow any kind of image transmission (analog or
      digital) in text digital portions of the bands here in the U.S.,
      provided that they are 500 Hz or less in bandwidth.

      The FCC redefined "data" to include image when under 500 Hz and can be
      found at:


      '97.3 Definitions.

      (c)(2) Data.Telemetry, telecommand and computer communications emissions
      having (i) designators with A, C, D, F, G, H, J or R as the first
      symbol, 1 as the second symbol, and D as the third symbol; (ii) emission
      J2D; and (iii) emissions A1C, F1C, F2C, J2C, and J3C having an occupied
      bandwidth of 500 Hz or less when transmitted on an amateur service
      frequency below 30 MHz. Only a digital code of a type specifically
      authorized in this part may be transmitted.

      Here are some interpretations of the ITU Emission Classifications:

      A1C = DSB AM digital FAX with no subcarrier

      F1C = FM FAX digital modulation with no subcarrier (MFSK)

      F2C = FM digital FAX with subcarrier

      J2C = digital SSB FAX with subcarrier

      J3C = analog SSB FAX
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