AVT mode
Amiga Video Transceiver AVT125 BW
AVT125BW is a reference-only analog SSTV row with 133 s duration, 320 x 400 raster, BW color model, and VIS 80, 81, 82, 83.
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 | AVT125BW |
|---|---|
| Support status | Reference only |
| Spec status | OK2MNM table row; Dayton N7CXI excludes AVT timing tables, so this remains reference-only. |
| Duration | 133 s listed for AVT125 BW |
| Frame | 320 x 400 |
| Data lines | 400 |
| Public VIS | VIS 80, 81, 82, 83 |
| Standard VIS code | 0x50, 0x51, 0x52, 0x53 (80, 81, 82, 83) |
| Extended/N-VIS | No |
| Color model | BW |
| Component sequence | Y |
| Line rate | 192 lpm |
| Public timing profile | Mode-list row gives 133 s total duration, 400 scan lines, 320 columns, and 192 lpm; line-level porch timing is not part of this catalog row. |
Strengths
- AVT125BW has a concrete catalogue row: 133 s listed for AVT125 BW, 320 x 400, BW, VIS 80, 81, 82, 83.
- AVT125BW's Y component order and 192 lpm line rate make it useful for comparing airtime, raster, and colour structure against related modes.
Tradeoffs
- AVT125BW is not app-supported yet, so the 133 s listed for AVT125 BW / 320 x 400 row should be treated as reference data rather than a verified transmit preset.
- AVT125BW 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 lists AVT 125 BW as BW, VIS 80/81/82/83, 133 s, 400 lines, 320 columns, 192.000 lpm. Dayton N7CXI is cited only for its AVT data caveat. Black-and-white AVT mode; exact identifiers are source-table dependent.
- 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.
- A Technical Description of SSTV ModesN7CXI Dayton paper - accessed 2026-08-24Classic technical timing reference for Robot, Martin, Scottie, Wraase, Pasokon, PD, and FAX480 families.