SCADA Radio Modem For Master Station

The GDSCM0 is a SCADA radio modem for master station with RS232 serial interface port. It is ideal for both point-to-multipoint and point-to-point applications, including remote Meter Reading (gas, electricity, heat), remote control of water distribution, remote control of irrigation systems and environmental monitoring.

In licensed systems, the master station may be assigned the primary transmit frequency that is used to communicate to all remote radios in the network. GDSCM0 radio modem supports half-duplex operation and enables transmission and reception working on the same frequency or different frequencies.

Specifications

1. General

(1) Operating frequency range: 136-174 MHz or 223-235 MHz

(2) Channel spacing: 25 KHz or 12.5KHz

(3) Number of channels: 60

(4) ANTENNA IMPEDANCE: 50 Ohm unbalanced

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

(6) FREQUENCY STABILITY TCXO: ±1.5ppm

(7)OPERATIONVOLTAGERANGE: 12V DC ( 11Vdc to 14.5V DC)

(8) STAND-BY CURRENT: 85mA

2. TRANSMITTER

(1) RF OUTPUT POWER: 1.5W 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: 6.0A @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 7ms

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 –70dB

(6) SPURIOUS AND IMAGE REJECTION: greater than –65dB

(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: GMSK

(2) AIR RATE: 19200 or 9600bps programmable

(3) INTERFACE BAUD RATE: 192000bps/16000bps/96000bps/8000bps/4800bps/2400bps programmable

(4) INTERFACE DATA BIT: 8 / 7 bit

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

(6) INTERFACE STOP BIT: 1 / 2 bit

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