Solutions to expand the radio signal coverage
- Retevis Solutions
- radio signal coverage solution, expand radio signal coverage, long range radio solution
radio signal coverage solutions overview:
With its unique real-time effect and outstanding role in management and security, wireless radio system has been widely used in railways, police, property management, hotel management, port terminals, entertainment places, stadiums, banks, factories, etc. all over the world, and has become an indispensable management means for modern safety management.
radio signal coverage solutions design idea and basis:
1, advanced principle:
The solution as a whole should have a certain leading level from resource allocation (including hardware equipment, technical means) to functional use.
2. Reliability principle:
The reliability of various resources of the radio solution system, including hardware equipment, should have a certain high standard, work stably and be easy to maintain; in case of hardware failure, there should be reliable backup means.
3. Principle of technical maturity:
The radio solution system should adopt advanced and mature technology as far as possible, so that it can be put into actual use after completion, and achieve the designed use effect.
4. Extensible principle:
The overall structure of the radio solution system is reasonable, the design capacity is moderate, and there should be scalability. Under the premise of protecting the original investment, the resource expansion can be increased, including the increase of communication coverage and distance.
Channel and signal coverage requirements
Three independent channels are required to work, and the signal covers the first and second floors of the basement, as well as the above ground part and between each floor.
According to the above requirements, the following system scheme is specially formulated:
According to the requirements, we choose the following scheme:
Adopt the normal middle turntable working mode, which has the advantages of simple equipment, unattended, stable and reliable operation, etc.
The whole communication network is GMRS wireless radio communication system.
According to the user's requirements, we propose Retevis RT9550 as the Repeater, which can increase the communication range and capability of the handheld radio, and solve the special coverage problems quickly, simply and economically, it provides a flexible solution for the establishment of repeaters that meet the requirements of various frequency bands and power levels. The system is easy to install, strong and durable, and can reflect superior performance in any harsh environment. It can be used in many occasions.
The radio solution can realize full-automatic unattended: the staff can call and talk within the coverage, without special personnel on duty.
Two new repeater stations are added, which are respectively responsible for the independent work of the two channels. omni-directional high gain antenna is selected for the antenna feeder system to ensure the signal strength. The antenna is installed on the top of the building to ensure the outdoor signal coverage.
The basement is divided into two floors, of which the underground two floors are divided into two parts. Wireless transmitting antennas are set on the underground one and the underground two floors respectively, so as to achieve wireless communication with the above ground part.
The simple sketch is as follows:
Recommend of main equipment:
Repeater: Retevis RT9550
The performance parameters of Retevis RT9550 as below:
| Specification | |||
| Working frequency | Receive:430-440Mhz,Transmit:440-450MHz(Frequency can be customized according to demand VHF:136-174MHzUHF:400-470MHz) | ||
| Channel space | 12.5kHz/25kHz | ||
| Multi-access mode | TDMA | ||
| Duplexing space | VHF:5.7MHz/10MHzUHF:10MHz | ||
| Modulation and demodulation | 4FSK/FFSK/FM | ||
| Successive data transmission speed(per carrier) | 9.6kbps | ||
| Carrier frequency error | <=100hz | ||
| Working humidity | 20%-80% | ||
| Storage humidity | <80% | ||
| Working temperature | -30℃~+60℃ | ||
| Storage temperature | -40℃~+85℃ | ||
| Receiver | |||
| Sensitivity(5%BER)(digital) | Static sensitivity | -120dBm | |
| Dynamic sensitivity | -115dBm | ||
| Sensitivity(12dB SINAD)(analogue) | -117dBm | ||
| Maximum signal Rx level | -7dBm | ||
| Adjacent channel selectivity | -65dB 12.5kHz/-70dB@25kHz | ||
| Channel inhibition | 12dB | ||
| Blocking | 84dB | ||
| Inter modulation | 70dB | ||
| Spurious response inhibition | 70dB | ||
| Conducted spurious transmission | -57dBm | ||
| Transmitter | |||
| Frequency stability | ±0.1ppm | ||
| RF output power | 3-100W | ||
| Maximum output power variation | ±1.5dB(normal) | ||
| +2/-3dB(Limit) | |||
| Adjacent channel power | -65dB 12.5kHz/-75dB@25kHz | ||
| Conducted/radiated interference(antenna) | 9kHz-1GHz<=-30dBm | ||
| 1GHz-12.75Ghz<=-30dBm | |||
| Conducted/radiated interference(antenna) | 30Mhz-1GHz<=-36dBm | ||
| 1GHz-12.75GHz<=-30dBm | |||
| Inter modulation attenuation | <=-60dB 12.5kHz | ||
| <=-70dB 25kHz | |||
| Adjacent channel power during transient switch | ±12.5kHz<=-50dB | ||
| ±25kHz<=-60dB | |||
Two way radio:Retevis RT29
Technical specification:
| Frequency Range | 400-480MHz |
| Channel Number | 16 |
| Output power | 10W |
| Working voltage | 7.4V DC |
| Battery capacity | 3200mAh(Li-ion) |
| Dimension(with battery, without antenna) | 151x58x38mm(5.9x2.3x1.5in) |
| Weight(With battery&antenna) | 335g(11.8oz) |
| Audio distortion | <5% |
| Frequency stability | ±2.5ppm |
| Max frequency deviation | ≤5KHz |
| Spurious emission | ≤7uW |
| Modulation mode | 16KΦF3E |
| Reference sensibility | ≤0.25uV |
| Squelch on sensibility | ≤0.2uV |
| Adjacent channel selectivity | ≥65dB |
| Spurious response | ≥55dB |
| International | ≥60dB |
| Current | ≤1.5A |
Purpose effect:
The actual communication effect of the above scheme is that there is no blind area in the main working area, the voice quality is good, and it can respond to each other. The system can be compatible with all types of walkie talkies in the same frequency band. It can be expanded or reduced at any time without affecting other users and systems.
