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SSTV TX transmits Slow Scan Television images from .BMP files stored on the SD card. The signal is transmitted as FM audio tones in the standard SSTV frequency range (1,500–2,300 Hz).

Controls

• File — Selects the .BMP file to transmit from the SSTV/ directory on the SD card.
• Mode — Selects the SSTV transmission mode. Default: Scottie 2.
• Frequency, Gain, AMP — Standard RF controls. Default gain: 12 dB.
• ▶ — Starts transmission. A progress bar shows the current scanline.

Supported Modes

Mode	VIS Code	Lines	µs/pixel
Scottie 1	60	256	432.0
Scottie 2 (default)	56	256	275.2
Scottie DX	76	256	1080.0
Martin 1	44	256	457.6
Martin 2	40	256	228.8
SC2-180	55	256	734.4

All modes transmit 320 pixels per line and 256 lines (320×256 total).

Image Requirements

• Format: 24-bit uncompressed BMP (.bmp)
• Size: exactly 320×256 pixels
• Location: SSTV/ directory on the SD card

Images that do not match the required resolution will produce incorrect output.

RF Parameters

Parameter	Value
Sample rate	3.072 MSps
Baseband bandwidth	1.75 MHz (fixed)
Frequency step	10 kHz

Settings Persistence

Settings are saved to tx_sstv.ini.