Wraase mode

Wraase SC-1 48

SC1-48 is a reference-only analog SSTV row with 48 s duration, 256 x 128 raster, RGB color model, and VIS 20.

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.

SC1-48 SSTV BBC-style colour test card — SC1-48 test card, 256 x 128

Mode spec

Short name	SC1-48
Support status	Reference only
Spec status	Reference timing row from the OK2MNM SSTV mode-list PDF.
Duration	48 s
Frame	256 x 128
Data lines	128
Public VIS	VIS 20
Standard VIS code	0x14 (20)
Extended/N-VIS	No
Color model	RGB
Component sequence	R-G-B
Line rate	489.102 lpm
Public timing profile	Mode-list row gives 48 s total duration, 128 scan lines, 256 columns, and 489.102 lpm; line-level porch timing is not part of this catalog row.

Strengths

SC1-48 has a concrete catalogue row: 48 s, 256 x 128, RGB, VIS 20.
SC1-48's R-G-B component order and 489.102 lpm line rate make it useful for comparing airtime, raster, and colour structure against related modes.

Tradeoffs

SC1-48 is not app-supported yet, so the 48 s / 256 x 128 row should be treated as reference data rather than a verified transmit preset.
SC1-48 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 SC1-48 as RGB, VIS 20, 48 s, 128 lines, 256 columns, 489.102 lpm. SC-1 reference variant; source tables should be checked for exact porch timing.

SSTV Handbook Chapter 5: List of SSTV modesSSTV Handbook - accessed 2026-08-24Reference for analog SSTV mode names, VIS codes, durations, line counts, column counts, and line rates.