Model Model 2400

Description

The Model 2400 Radio ModemThe Model 2400 is a Frequency-Hopping Spread Spectrum radio modem with an RS232 serial interface. It operates in the 2.4 GHz ISM band license-free with worldwide compliance at full duplex speeds up to 115.2 Kbps asynchronous or 64 Kbps synchronous. The radio has an over-the-air data rate of 250 Kbps. The basic modem has 100 mW of output power and a range of over 1000 feet with a small whip antenna attached to the jack on the rear panel. Ranges in excess of 50 miles (90 Km) line-of-site are possible with high gain directional antennas and an external pole mounted amplifier (YDI's Model AMP2440).

Applications

The Model 2400 radio modem provides reliable wireless connectivity for both point-to-point and point-to-multipoint networks. The modems pass data transparently and can be used in virtually any application where a wireless RS232 data connection is needed. Point-to-point links are ideal for connecting Internet routers' together!

For point-to-multipoint applications, a "star" network topology would normally be used: one unit is configured as a base station, and the remainder as remotes. The base at the center of the star would connect to a host computer which could can either broadcast data to all the remotes or setup temporary virtual point-to-point connections with each remote individually. An internal buffer and an optional error-checking over-the-air protocol ensure smooth, error-free data flow.

Programming the Model 2400

The Model 2400 is easily programmed using the RS232 serial port of a PC, simplifying the task of integration. The configuration will be held in nonvolatile memory when the unit is powered off.

Features of the Model 2400

Full duplex synchronous up to 64 Kbps or asynchronous data formats up to 115.2 Kbps

Fade-resistant frequency-hopping technology with 82 frequency channels (2401-2482 MHz)

Transparent ARQ protocol with 6K buffer helps assure data integrity

Line-of-sight ranges of over 30 miles (50 Km) possible with external pole mounted amplifiers

Data rate over-the-air between units of 250 Kbps

Digital addressing supports up to 16 networks, with 255 remotes per network

Transparent "ping" feature to enable the base modem to check the operational status of each remote unit in the network

Single RS232 interface for both data and configuration

User programmable using a PC or dumb terminal

Built-in data encryption

Nonvolatile memory stores configurations when powered off

Smart power management features

Optional Received Signal Strength Indicator (RSSI) output jack

Internal clock generator option for use with synchronous DTEs that require a transmit clock

The Model 2400 with cover removed, highlighting the radio module

The Model 2400 with cover removed, highlighting the radio module. This module is available separately for OEM applications. It has a TTL level serial data interface and requires 5-9 VDC regulated.

Spread Spectrum Technology

Frequency Hopping Spread Spectrum technology ensures maximum resistance to noise and multi-path fading and robustness in the presence of interfering signals. Instead of transmitting on a single channel, the unit switches over 82 frequency channels randomly 40 times per second. When noise or interference is encountered on a particular channel, the unit simply buffers data until a clear transmit channel is found. The sequence of channels, or hop pattern, used by the radio is pseudo-randomly determined to minimize interference with other systems. Sixteen different configurable hop patterns allow up to 16 separate Model 2400 networks to operate in the same area with up to 255 remotes per network. The Model 2400 can be programmed to use CSMA or TDMA multipoint techniques.

Technical Specifications RF Frequency: 2401 to 2482 MHz Spread Spectrum Technique: Frequency hopping FCC Certification: FCC Part 15.247 both with and without external amplifier. Operating Range: Using whip on rear of the unit, 500' to 1000' typical, maximum range is 3500'. With the external power amplifier and high gain antennas, over 50 miles (90 Km) line-of-site can be achieved. Network Topology: Point-to-point or point-to-multipoint star networks Network Protocol: CSMA or TDMA with ARQ Serial Data Interface: RS-232 Sync or Async I/O Data Rate: Up to 115.2 Kbps Channel Data Rate: 250 Kbps No. of Frequency Channels: 82 RF Bandwidth: 400 kHz  Transmit Power Output: 10 mW or 100 mW Receiver Sensitivity -95 dBm Supply Voltage: 11 V to 14 VDC Current Consumption: 50 mA to 200 mA; (100 mA avg.) Physical Dimensions Weight: approx. 1 lb. Size: 4.5" W x 1.5" H x 6.5" L Operating Temperature: -20° to +60° Celsius Humidity: 20% to 90% (non-condensing) Connectors RF Connectors: Reverse polarized TNC Jack Power Connector: Barrel Jack, 5 mm O.D., 2.1 mm I.D., center positive Data Connector: DB-25 Female Notes --- This transceiver conforms to US and European regulations.  --- US: FCC rules and regulations (Part 15.247 radio frequency devices).  --- EC: European Telecommunications Standard (ETS); (BRET300328). Model 2400/AMP2440 FCC Type Accepted Configurations Radio Equipment  24 dB Grid 21 dB Grid 18 dB Grid 14 dB  Yagi 12 dB  Yagi 12 dB Panel 12 dB Omni 6 dB Omni  Model 2400 Modem X X X X X X X X Model 2400 Modem with AMP2440-250 X X X X X X X X Model 2400 Modem with AMP2440-400 X X X X X Maximum ERP Calculations for FCC Part 15 Certification The maximum TX power with 24 dB gain grid dish antenna is calculated as follows:         1.  1 watt (+30 dBm) limit with 6 dB gain antenna         2.  24 dB - 6 dB = 18 dB         3.  Drop TX power 1 dB for every 3 dB increase in antenna gain.  18 /3 = 6 dB         4.  +30 dBm - 6 dB = 24 dBm or 250 mW alberghi a LeedsFor an 18 dB gain antenna:         1.  18 dB - 6 dB = 12 dB         2.  12 dB / 3 = 4 dB         3.  +30 dBm - 4 dB = +26 dBm or 400 mW