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Kenwood FAST FM mode

Kenwood FAST FM

Kenwood FAST FM is a very fast 13 s YCrCb row; the OK2MNM note marks its VIS behavior as odd parity.

Reference only

Mode sample

BBC-style colour test card and app-generated audio

The image is generated locally for this mode's raster. For supported modes, the audio sample is encoded from that image with the SSTV Signal Desk transmitter code, then published as lossless FLAC for static playback.

No app-generated audio sample is published for this reference-only mode because no matching transmitter entry exists in the app code.

FAST FM SSTV BBC-style colour test card
FAST FM test card, 320 x 240

Mode spec

Short nameFAST FM
Support statusReference only
Spec statusReference timing row from the OK2MNM SSTV mode-list PDF.
Duration13 s
Frame320 x 240
Data lines240
Public VISVIS 90
Standard VIS code0x5A (90)
Extended/N-VISNo
Color modelYCrCb
Component sequenceY-RY-BY
Line rate1118.881 lpm
Public timing profileMode-list row gives 13 s total duration, 240 scan lines, 320 columns, and 1118.881 lpm; line-level porch timing is not part of this catalog row.

Strengths

  • FAST FM has a concrete catalogue row: 13 s, 320 x 240, YCrCb, VIS 90.
  • FAST FM's Y-RY-BY component order and 1118.881 lpm line rate make it useful for comparing airtime, raster, and colour structure against related modes.

Tradeoffs

  • FAST FM is not app-supported yet, so the 13 s / 320 x 240 row should be treated as reference data rather than a verified transmit preset.
  • FAST FM still needs implementation-grade porch, sync, and pixel timing before an app-generated WAV/FLAC sample can be published with the same confidence as supported modes.

Source notes

OK2MNM SSTV Handbook chapter 5 lists FAST FM as YCrCb, VIS 90, 13 s, 240 lines, 320 columns, 1118.881 lpm. Kenwood FAST FM image mode referenced in SSTV Handbook style analog lists.