title: SSTV Mode Details - M1 and M2 description: Introduction to classic M1 and M2 SSTV modes

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M1 and M2 Modes

M1 Mode

M1 is the simplest SSTV mode and one of the most commonly used.

• Resolution: 320×240 pixels
• Transmission Time: 110 seconds
• Bandwidth: 2.5 kHz
• Color: Color
• Frequency Range: 1200-2300 Hz

Features of M1

• Fast transmission
• Low bandwidth requirement
• Easy to receive
• Suitable for beginners

M2 Mode

M2 is an improved version of M1, providing better image quality.

• Resolution: 320×240 pixels
• Transmission Time: 145 seconds
• Bandwidth: 2.5 kHz
• Color: Color
• Frequency Range: 1200-2300 Hz

Features of M2

• Longer transmission time
• Higher signal quality
• Better noise tolerance
• Suitable for long-distance communication

Comparison

The main difference between M1 and M2 is the transmission time. M2 takes more time to transmit the same resolution image but provides better reception under weak signal conditions.

When to Use

• M1: Strong signal, short distance, need fast transmission
• M2: Weak signal, long distance, need reliability

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