Scottie mode
Scottie 3
S3 is a reference-only analog SSTV row with 55 s duration, 320 x 128 raster, RGB color model, and VIS 52.
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 | S3 |
|---|---|
| Support status | Reference only |
| Spec status | Reference timing row from the OK2MNM SSTV mode-list PDF. |
| Duration | 55 s |
| Frame | 320 x 128 |
| Data lines | 128 |
| Public VIS | VIS 52 |
| Standard VIS code | 0x34 (52) |
| Extended/N-VIS | No |
| Color model | RGB |
| Component sequence | G-B-R |
| Line rate | 140.115 lpm |
| Public timing profile | Mode-list row gives 55 s total duration, 128 scan lines, 320 columns, and 140.115 lpm; line-level porch timing is not part of this catalog row. |
Strengths
- S3 has a concrete catalogue row: 55 s, 320 x 128, RGB, VIS 52.
- S3's G-B-R component order and 140.115 lpm line rate make it useful for comparing airtime, raster, and colour structure against related modes.
Tradeoffs
- S3 is not app-supported yet, so the 55 s / 320 x 128 row should be treated as reference data rather than a verified transmit preset.
- S3 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 S3 as RGB, VIS 52, 55 s, 128 lines, 320 columns, 140.115 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.