Radio Modem Wth GMSK Modulation

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Payment Type:: T/T

Incoterm:: FOB

Min. Order:: 2 Set/Sets

Min. Order:: 2 Set/Sets

Delivery Time:: 9 Days

Transportation:: Ocean, Land, Air

Port:: Shenzhen

Quantity:

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Basic Info

Place of Origin:	China
Productivity:	10000 sets / year
Supply Ability:	20000 sets / year
Payment Type:	T/T
Incoterm:	FOB
Certificate:	SO9001 certification
Transportation:	Ocean,Land,Air
Port:	Shenzhen

Product Description

The GDMDGM is a radio modem with GMSK modulation scheme and supports 8000 to 19200bps over the air rate. Operating in VHF or UHF bands, the data radio transceiver is one of the most versatile and fast radio modems.

The error rate is minimized by means of Forward Error Correction (FEC) . Data packets are split in several blocks before transmission and adds correction information inside the blocks. It can effectively overcome the interference that may be encountered in harsh environments, enhancing the capability of the modem to resist noise and other interference.

GMSK Modulation Radio Modem

Specifications

1. General

(1) OPERATINGFREQUENCYRANGE: 400-430MHz

(2) CHANNEL SPACING: 25KHz

(3) Number of channels: 16

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

(5) FREQUENCY STABILITY TCXO: ±1.5ppm

(6) OPERATIONVOLTAGERANGE: 11Vdc to 14.5V DC

(7) STAND-BY CURRENT: 85mA

2. TRANSMITTER

(1) RF OUTPUT POWER: 8W programmable

(2) RECEIVER ATTACK TIME: 10ms

(3) AUDIO FREQUENCY DISTORTION

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

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

(6) REFERENCE OSCILLATOR: TCXO

(7) REFERENCE OSCILLATOR: 50 Ohm unbalanced

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

(9) AUDIO FREQUENCY DISTORTION: 3% 1KHz for 3KHz deviation (under normal test condition)

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

2. RECEIVER

(1) TYPE OF RECEIVER:Crystalcontrolled double, super heterodyne
(2) INTERMEDIATE frequency: 45 MHz(1^st IF), 455KHz(2^nd 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: 8000 to 19200bps
(3) INTERFACE DATA BIT: 8 /7bit
(4) INTERFACE PARITY BIT: None / Even / Odd
(5) INTERFACE STOP BIT: 1/2 bit

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