Pasokon mode
Pasokon P7
Pasokon family analog SSTV operation and compatibility reference.
Supported in appMode 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.
FLAC, 48 kHz, 16-bit mono, 408.44 s.
Round-trip decode evidence
Encoded, compressed losslessly, restored, then decoded.
The published FLAC is restored to WAV and passed through the SSTV Signal Desk receiver sample harness. The receiver decoded P7 from the FLAC-restored WAV and wrote 496 image lines for this P7 test card.
Open the generated decode reportMode spec
| Short name | P7 |
|---|---|
| Support status | Supported in app |
| Spec status | Supported in app; public VIS and timing summary are separated from the app raw timing fields. |
| Duration | 406.100 s |
| Frame | 640 x 496 |
| Data lines | 496 |
| Public VIS | VIS 115 (0x73) |
| Standard VIS code | 0x73 (115) |
| Extended/N-VIS | No |
| Color model | RGB |
| Component sequence | R-G-B |
| Line rate | 73.282 lpm |
| Public timing profile | Public Pasokon P7 timing: VIS 115; 496 lines; 10.417 ms sync, 2.083 ms porch, then Red, Green, and Blue scans with 266.666 ms color scan time. |
| App duration | 406.100 s |
| App frame | 640 x 496 |
| App raw VIS | 0xF3 (243) |
| App timing profile | App RX line fields: sync 10.417 ms; front porch 2.083 ms; back porch 2.083 ms; separator/blank 2.083 ms; video tones 1500-2300 Hz around 1900 Hz. |
| App RX sync | 10.416666666666666 ms |
| App RX front porch | 2.0833333333333335 ms |
| App RX back porch | 2.0833333333333335 ms |
| App RX separator/blank | 2.0833333333333335 ms |
| App subcarrier | 1900 Hz |
| App deviation | 400 Hz |
| App tone range | 1500-2300 Hz |
Strengths
- P7 is a extended high-detail Pasokon mode: 406.100 s, 640 x 496, RGB.
- P7 uses R-G-B RGB component order and VIS 115 (0x73), giving receivers enough mode identity to separate it from neighbouring Pasokon rows.
- P7 has explicit app timing fields: 10.417 ms sync, 2.083 ms front porch, 2.083 ms back porch, 2.083 ms separator/blank, and 1500-2300 Hz around 1900 Hz video tones.
- P7 has a checked public timing summary plus app timing fields, so the public spec and implementation timing can be compared line by line.
Tradeoffs
- P7's 406.100 s transfer can carry more picture detail, but it occupies the channel longer and is less forgiving of fades across the 640 x 496 frame.
- P7 sends colour sequentially in RGB; sync drift can appear as colour fringing before the whole frame becomes unreadable.
Source notes
Public VIS/timing labels are normalized from checked SSTV references where available. App raw VIS 0xF3 and app timing fields are generated from sstv/sstv/sstv/sstvparam.swift during the website build.
- SSTV Signal Desk SSTVTableSSTV Signal Desk - accessed 2026-08-24Authority for app-supported mode names and app timing parameters.
- 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.