Short range SCADA wireless modem

The GDCA05 is an SRM serial wireless modem that provides the highest level of reliability for antenna serial data transmission.  It works well in any mode, such as point-to-point wireless bridges, point-to-multipoint and interrupter modes, making it ideal for short and long distances in the harshest industrial environments.

Nowadays, the demand for wireless modems is gradually increasing. In order to ensure cost-effective and reliable manner ways of transmitting data in the form of voice and video, infrastructure with less modem requirements is used to facilitate communication.

Specifications

1. General 

(1) OPERATINGFREQUENCYRANGE: 150-174MHz

 (2) Number of channels: 60
(3) ANTENNA IMPEDANCE: 50 Ohm unbalanced
(4) OPERATING TEMPERATURE: -40 to +70℃
(5) FREQUENCY STABILITY TCXO:  ±2.0ppm
(6) 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: GMSK
 (2) AIR RATE: 0~1200 bps programmable
 (3) INTERFACE DATA BIT: 8 bit
 (4) INTERFACE PARITY BIT: None / Even / Odd
 (5) INTERFACE STOP BIT: 1 / 2 bit programmable