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SROAM Bell 202 Radio Modem Board
Overview
Bell 202 Radio Modem BoardOur SROAM is a Bell 202 Compatible 1200bps half duplex radio modem, with an RS-232 serial interface.
It is designed as a stand alone unit. The SROAM has a built in 10 pin interface for standard low power data radios, and can also be directly interfaced to many mobile radios without making modifications.
Features
- Adjustments for pre-emphasis and de-emphasis
- Selectable band pass filter and limiter
- Wide range audio adjustments
- On board power fuse for radio power
- Radio lockout timer
- LED indicators and test button generates alternating tone pattern for modulation adjustment
Specifications
| Mechanical | |
|---|---|
| Size: | 3" x 7-3/4" x 1-1/2" PC board snap track |
| Data interface: | RS-232, 9 pin male Tx, Rx, DTR, DSR, DCD |
| Radio interface: | Standard 10 pin ribbon cable or hi density terminal block: +12, Gnd, Tx, Rx, Key, CD |
| Environmental | |
| Operating temperature: | -40 to 140 deg. F (-40 to +60 deg. C) |
| Relative humidity: | 20 to 90% non-condensing |
| Power requirements | |
| Voltage: | 10 VDC to 15 VDC, 12 VDC nom (120-160 mA @ 12 VDC without radio) |
| Current: | 1 A maximum with poly fuse or 10 A maximum with fuse |
| Modem | |
| Style: | Bell 202 |
| Mark frequency: | 1200 Hz |
| Space frequency: | 2200 Hz |
| Modulation: | Frequency shift key (FSK) |
| Baud rate: | 1200 bits/sec asynchronous half duplex |
| Transmit output power | 0-8 Vpp with adjustment pre-emphasis/de-emphasis (+/-6 dB) |
| Receive sensitivity | 100 mVpp minimum, adjustable (+/-6 dB max skew) |
| Transmit lockout | After 11 seconds of continuous transmission |
