Vehicle-Mountable COFDM mobile transmission system
Features：
1．Directly frequency-converting in multi-band：300～800MHz
2．Multi-bandwidth COFDM modulation technique：8 / 4 / 2 MHz（optional）
3．Video compression：MPEG2
4．Be able to have bidirectional voice communication to make dispatch and command conveniently during work.
5．support high-speed mobile transmission
6．support NLOS transmission；
7．Light weight and sturdy construction
8．Dimension：420mm×300mm×88mm（2U Standard rack chassis）
9．Weight：7Kg
Technical Indexes
High-frequency unit
Operating frequency: 300～800MHz
Transmitter Maximum power output: 5W／10W／20W（optional）
Channel Bandwidth: 8／4／2 MHz
Receiver input level: 0dBm ～ -100 dBm（without LNA）
Antenna Interface: N type， 50Ω
Baseband Unit
The Number of the OFDM Sub-carriers: 2K／8K
Protection gap: 1/32，1/16，1/8，1/4（optional）
Channel Encode : 1/2，2/3，3/4（optional）
Modulation Constellation : QPSK
System Indicators
The electrical level of receiving threshold: -99dBm（10-6 BER）
Transfer distance: 10W transmitting module>10 Kilometers
Displacement speed : 200 Kilometer per hour can be received steadily.
Video/Audio Parameters
Image formats: PAL or NTSC composite video SD-SDI
image quality: to or over DVD effect
Image resolution: 720×576 Pixel
Video Compression: MPEG-2，4：2：0，MP@ML
Code rate: 1～20Mbps
Voice input: Dual Audio Channel 12dBm
Acoustic coding: 728Kbps Stereo
Sampling rate: 32KHz
A/V interface: RCA@75Ω unbalanced
Working Environment
Power supply: DC12V/15V
Whole Power Consumption: 100W(output power＝20W)
Working temperature: －20°C ～ +55°C
Backboard COFDM Mobile Transmission Equipment
Features：
1. The head-end system adopts the COFDM modulating technique and MPEG-2 images compression technique, which can make sure the high performance of transmission and high quality of image.
2. With the function of non-vision distance transmission and transmission in motion,；
3. The head-end uses all-purpose video interface, which is suitable for common analog camera and digital cameral, and can be also connected with CCDcamera(including helmet type cameral) , and image acquisition equipments for military use, such as night viewing, infrared index, thermal imager, and also for professional cameral；
4. Backboard transmitter uses the base suitable for professional cameral.
5. Backboard equipment uses totally-enclosed heatsinking as machine shell, to extract the heat inside the machine and get high security for system. The shell can prevent dust, prevent water and prevent shake.
6. The A/V interface of backboard transmitter is standard BNC and RCA, and the power interface is Φ3.5mm type.
Transmitter Technical Indexes：
Modulation type： COFDM，2K，QPSK
Frequency channel working：3~800MHz
Route bandwidth： 8MHz;
Image compression form: MPEG2 4：2：0
Transfer distance： Backboard transmitter ≥2-5 km(Under completely noticeable situation);
Output power： Backboard transmitter :0.5W-3W
Transfer delay： ≤40ms
Displacement speed： ≥170 Kilometres per hour;
Passage bandwidth： 8MHz
FEC： 1/2
Protection gap： 1/32
Battery on-time： Backboard transmitter ≥2hours（Standby power supply can be equiped ）
Power interface： Backboard power supply、3.5mm
Equipment weight： Backboard transmitter≥1.5kg(Does not contain alternate battery)
Electricity Supply： AC 220V, DC 12V
Working temperature： -25°C~+55°C；
Equipment appearance： Black，115×82×167，1.7Kg
Environment humidity： ≥95%
Transmitter structure： Use radiator as machine shell
Protection standard： Prevent Rusting，Prevent Shake
Backboard system audio and video technology indicators
Image formats: PAL or NTSC composite video SD-SDI
Video compression/extract standards： MPEG-2；
Distinguish rate： 720 horizontal line 576 vertical line；
Video rate： above 4.9Mbit/s（adjustable）；
Audio channels： Left and right |
