The CH-M2C3H2 EV-DO Modem from Chonghan Technology is a dual-band wireless modem designed for low data rate communication such as SMS, CSD, and dial-up internet. It features a rugged metal casing, standard serial data interface, and SIM card slot.
The CH-M2C3H2 EV-DO modem is designed for low‑data‑rate communications such as SMS, CSD and packet data in M2M applications. It features a rugged metal enclosure, standard SIM holder, and a range of interfaces for integration into industrial, transportation, utility and security systems.
The datasheet provides detailed specifications including supported frequency bands, receiving sensitivity, output power, voltage and environmental limits, mechanical dimensions, supported protocols, and package contents. It also lists warranty information and contact details for SZchonghan. This manual is written in Chinese.
| Frequency Band (800 MHz) – Transmit | 824‑849 MHz |
|---|---|
| Frequency Band (800 MHz) – Receive | 869‑894 MHz |
| Frequency Band (1900 MHz) – Transmit | 1850‑1910 MHz |
| Frequency Band (1900 MHz) – Receive | 1930‑1990 MHz |
| Output Power | 1 W @ -75 dBm |
| Supply Voltage | DC 5‑25 V |
| Operating Temperature | -10 °C to +55 °C |
| Storage Temperature | -40 °C to +85 °C |
| Dimensions | 100 mm × 70 mm × 20 mm |
| Weight | 200 g |
| Supported Protocols | CDMA2000 1x, EV‑DO Rev 0, EV‑DO Rev A |
| Downlink Speed | 3.1 Mbps |
| Uplink Speed | 1.8 Mbps |
| USB Interface | USB Type‑B Female, USB 2.0 data interface |
| SIM Card Type | Mini‑SIM, 1.8/3.3 V |
The device requires a DC supply between 5 V and 25 V.
The modem measures 100 mm × 70 mm × 20 mm and weighs approximately 200 g.
The product comes with a one‑year warranty.