Scottie mode
Scottie 4
S4 is a reference-only analog SSTV row with 36 s duration, 320 x 128 raster, RGB color model, and VIS 48.
Reference onlyMode 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.
Mode spec
| Short name | S4 |
|---|---|
| Support status | Reference only |
| Spec status | Reference timing row from the OK2MNM SSTV mode-list PDF. |
| Duration | 36 s |
| Frame | 320 x 128 |
| Data lines | 128 |
| Public VIS | VIS 48 |
| Standard VIS code | 0x30 (48) |
| Extended/N-VIS | No |
| Color model | RGB |
| Component sequence | G-B-R |
| Line rate | 216.067 lpm |
| Public timing profile | Mode-list row gives 36 s total duration, 128 scan lines, 320 columns, and 216.067 lpm; line-level porch timing is not part of this catalog row. |
Strengths
- S4 has a concrete catalogue row: 36 s, 320 x 128, RGB, VIS 48.
- S4's G-B-R component order and 216.067 lpm line rate make it useful for comparing airtime, raster, and colour structure against related modes.
Tradeoffs
- S4 is not app-supported yet, so the 36 s / 320 x 128 row should be treated as reference data rather than a verified transmit preset.
- S4 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 S4 as RGB, VIS 48, 36 s, 128 lines, 320 columns, 216.067 lpm. Less common Scottie family variant beyond S1, S2, and DX.
- 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.