Radio Modem With 25W Output Power

GDMP25 is designed to be long distance and high performance wireless data radio modem. This radio supports multiple frequency bands in VHF and UHF with 25W power output. It has long transmission distance which reaches more than 30km in open air environment.

GDMP25 radio modem is optimized for throughputs of up to 19200bps with 25KHz channel spacing, providing robust and secure two way wireless communications in challenging indoor and outdoor environments. It is typically used in systems of industrial monitoring and control applications.

Specifications

1. General 

(1)OPERATINGFREQUENCYRANGE: 136 to 150MHz

(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:  ±2.5ppm
(7) OPERATION VOLTAGE RANGE: DC 11V to 14V (Typical 12V)
( 8) STAND-BY CURRENT: 110mA
2. TRANSMITTER

(1) RF OUTPUT POWER: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) : Better than 0.2uV

(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 1 KHz for ±5KHz deviation
(8) FM HUM AND NOISE RATIO:  greater than 40dB

3. Data and Interface 

 (1) MODULATION: GMSK
 (2) AIR RATE: 19200bps programmable
 (3) INTERFACE DATA BIT: 8 bit
 (4) INTERFACE PARITY BIT: None / Even / Odd
 (5) INTERFACE STOP BIT: 1 bit