Wireless Modem With RS232 At 4800bps Air Rate

Basic Info

Model No.: GDW248

Application: Industrial, Civilian

Certification: ISO

Style: Sky Wave

Condition: Used

Standard: Standard

Screen: With Screen

Additional Info

Packaging: Environmentally friendly paper packaging

Productivity: 10000 sets / year

Brand: PuFangTech

Transportation: Ocean,Land,Air

Place of Origin: China

Supply Ability: 20000 sets / year

Certificate: SO9001 certification

Port: Shenzhen

Product Description

The GDW248 is a 4800bps air rate wireless modem operating in VHF and UHF bands with RS232 serial port. With output power of 1.5 watts to 25 watts, it meets various coverage range requirement.

These wireless modem products are well-suited for wireless process control, wireless SCADA and wireless telemetry applications. With transparent half-duplex serial transmission provided for sending and receiving serial port data, GDW248 makes establishing data collection and remote control systems easily. It work reliably in the presence of interfering signals and strong nearby carriers.

Specifications

1. General

   (1) Operating frequency range: 420 to 440MHz

   (2) Channel spacing: 25 KHz

   (3) Number of channels: 16

   (4) ANTENNA IMPEDANCE: 50 Ohm unbalanced

   (5) OPERATING TEMPERATURE: -40 to +70℃

   (6) FREQUENCY STABILITY TCXO:   ±2.5 ppm

   (7)OPERATIONVOLTAGERANGE: 12V ( 11V to 14V ) DC  

(8) STAND-BY CURRENT: 110 mA

2. TRANSMITTER

   (1) RF OUTPUT POWER: 1.5 W to 25W programmable

   (2) OUTPUT 2ND HARMONIC: less than –65dB

   (3) SPURIOUS EMISSIONS:  less than 0.25uW (30MHz to 1GHz)

   (4) MAXIMUM FREQUENCY DEVIATION: ±5KHz

   (5) REFERENCE OSCILLATOR: TCXO

   (6) RF IMPEDANCE: 50 Ohm unbalanced

   (7) CURRENT DRAIN:5.0A @25W output power

   (8) FM HUM AND NOISE RATIO: greater than –50dB

   (9) AUDIO FREQUENCY DISTORTION: 3% 1KHz for 3KHz deviation

   (10) AUDIO FREQUENCY RANGE: 300Hz to 3400Hz ±2dB

   (11) TRANSMITTER ATTACK TIME: less than 20 ms

2. RECEIVER

   (1) TYPE OF RECEIVER:Crystalcontrolled double, super heterodyne

   (2) INTERMEDIATE frequency: 45MHz(1st IF), 455KHz(2nd IF)

   (3) SENSITIVITY: Better than 0.2uV @12dB SINAD

   (4) SQUELCH SENSITIVITY: 0.1uV to 1uV programmable

   (5) ADJACENT CHANNEL SELECTIVITY: greater than –70B

   (6) SPURIOUS AND IMAGE REJECTION: greater than –70dB

   (7) OUTPUT AUDIO DISTORTION: 3% at 1KHz for ±5KHz deviation

   (8) FM HUM AND NOISE RATIO:  greater than 40dB

3. Data and Interface

   (1) MODULATION: MSK

   (2) AIR RATE: 4800bps bps programmable

   (3) INTERFACE BAUD RATE: 0~4800 bps programmable

   (4) INTERFACE DATA BIT: 8 /7bit

   (5) INTERFACE PARITY BIT: None / Even / Odd

   (6) INTERFACE STOP BIT: 1 /2bit