Pasokon mode

Pasokon P5

Pasokon family analog SSTV operation and compatibility reference.

Supported in app

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.

FLAC, 48 kHz, 16-bit mono, 306.908 s.

P5 SSTV BBC-style colour test card — P5 source card, 640 x 496

P5 SSTV round-trip decoded test card — Receiver decoded P5 from the FLAC-restored WAV, 496 lines.

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 P5 from the FLAC-restored WAV and wrote 496 image lines for this P5 test card.

Open the generated decode report

Mode spec

Short name	P5
Support status	Supported in app
Spec status	Supported in app; public VIS and timing summary are separated from the app raw timing fields.
Duration	304.575 s
Frame	640 x 496
Data lines	496
Public VIS	VIS 114 (0x72)
Standard VIS code	0x72 (114)
Extended/N-VIS	No
Color model	RGB
Component sequence	R-G-B
Line rate	97.71 lpm
Public timing profile	Public Pasokon P5 timing: VIS 114; 496 lines; 7.813 ms sync, 1.563 ms porch, then Red, Green, and Blue scans with 200.000 ms color scan time.
App duration	304.575 s
App frame	640 x 496
App raw VIS	0x72 (114)
App timing profile	App RX line fields: sync 7.813 ms; front porch 1.563 ms; back porch 1.563 ms; separator/blank 1.563 ms; video tones 1500-2300 Hz around 1900 Hz.
App RX sync	7.8125 ms
App RX front porch	1.5625 ms
App RX back porch	1.5625 ms
App RX separator/blank	1.5625 ms
App subcarrier	1900 Hz
App deviation	400 Hz
App tone range	1500-2300 Hz

Strengths

P5 is a extended high-detail Pasokon mode: 304.575 s, 640 x 496, RGB.
P5 uses R-G-B RGB component order and VIS 114 (0x72), giving receivers enough mode identity to separate it from neighbouring Pasokon rows.
P5 has explicit app timing fields: 7.813 ms sync, 1.563 ms front porch, 1.563 ms back porch, 1.563 ms separator/blank, and 1500-2300 Hz around 1900 Hz video tones.
P5 has a checked public timing summary plus app timing fields, so the public spec and implementation timing can be compared line by line.

Tradeoffs

P5's 304.575 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.
P5 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 0x72 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.