Wireless Modem Wth RS485 At 4800bps Air Rate

Basic Info

Model No.: GDW448

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

GDW448 is an half-duplex wireless modem that operates on VHF or UHF bands. Channel spacing 12.5 and 25 kHz are available, with over-the-air data rates 4800bps. It provides high available RS485 connectivity with reliable radio technology and switchover functionality. Support for serial components is ensured by serial modes of operation as well as protocol conversions.

GDW448 can meet the requirements of mission critical connectivity: high availability, long-range connectivity, easy and error-free deployment. Configuration is easy with downloadable configuration software. 

Specifications

1. General 

(1) OPERATINGFREQUENCYRANGE: 150-174MHz

(2)Channel spacing:12.5 and 25 kHz

 (3) Number of channels: 60
(4) ANTENNA IMPEDANCE: 50 Ohm unbalanced
(5) OPERATING TEMPERATURE: -40 to +70℃
(6) FREQUENCY STABILITY TCXO:  ±2.0ppm
(7) OPERATION VOLTAGE RANGE: 12V (11V to 14V) DC

 (7) STAND-BY CURRENT: 90mA
2. TRANSMITTER

(1) RF OUTPUT POWER: 5W-25W programmable

(2)RECEIVER ATTACK TIME: <10ms

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

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

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

(6) MAXIMUM FREQUENCY DEVIATION: ±5KHz

(7) REFERENCE OSCILLATOR: TCXO

(8) RF IMPEDANCE: 50 Ohm unbalanced

(9) FM HUM AND NOISE RATIO: greater than –50dB (under normal condition)

2. RECEIVER 
(1) TYPE OF RECEIVER:Crystalcontrolled double, super heterodyne
(2) INTERMEDIATE frequency: 45MHz (1st IF), 455KHz (2nd IF)
(3) SENSITIVITY(12 dB SINAD) : less than 0.2uV

(4) SQUELCH SENSITIVITY: 0.1uV to 1uV programmable
(5) ADJACENT CHANNEL SELECTIVITY: greater than –65dB
(6) SPURIOUS AND IMAGE REJECTION: greater than –65Db

(7) OUTPUT AUDIO DISTORTION: 3% at 1 KHz for ±5KHz deviation
(8) FM HUM AND NOISE RATIO:  greater than 40dB

(9) SQUELCH SENSITIVITY: 0.3uV

3. Data and Interface 

 (1) MODULATION: MSK
 (2) AIR RATE: 4800 bps programmable
 (3) INTERFACE DATA BIT: 8 bit
 (4) INTERFACE PARITY BIT: None / Even / Odd
 (5) INTERFACE STOP BIT: 1 / 2 bit programmable