MOD950 is a wireless modulation and demodulation device designed to work with general FM radios. It has a compact size and convenient connections. It supports audio input/output and signal modulation functions for radios and can be used for data transmission with computers.
The MOD950 is a wireless modem designed to work with generic FM radios. It provides a radio connector and a computer connector, both 9‑pin, and defines the signal levels and control signals required for proper operation. The manual includes diagrams of the modem dimensions, connector locations, and wiring relationships.
Port definitions are detailed for the radio side (audio input, modulation output, PTT control, ground, and 12 V power) and the computer side (ground, serial TX/RX, DTR, DSR, and signal ground). Adjustment procedures for audio level (using potentiometer W1) and frequency deviation (using potentiometer W2) are also described. This manual is written in Chinese.
| Radio audio input level (standard) | VP-P = 1 V |
|---|---|
| Minimum acceptable audio input level | VP-P ≥ 0.5 V |
| Power supply voltage | +12 V to –8 V |
| Factory audio output level | VP-P = 1 V |
| Maximum frequency deviation | 3 kHz |
| Connector type | 9‑pin D‑sub (both sockets) |
| PTT control signal | Active low |
The DTR pin indicates the type of serial data: logic 0 for command data and logic 1 for wireless transmission data; it also shows whether the host is ready to receive data.
The modem is powered from a 12 V source with a voltage range of +12 V to –8 V.