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                                        7- 8 GHz RRL equipment

 

The RRL equipment is intended for building a duplex RRL (reception/ transmission) including four channel
service link that is important for mobile TV stations. It can be powered by 12V source. Broadcast quality of
transmitted signals allows to use this equipment in radio and TV studios.Some modifications differing in
quantity of transmitted TV channels and Input signal format (CVBS or SDI) are available.
  
                                                                         Operation principle:
 
Input signals (video, audio and service) are fed to a modulator. The modulator/coder is a multifunction
device including converter of analog/ composite signals into digital format , then МРЕG2 coder , transport
stream multiplexer + QPSK modulator to 70MHz or satellite tuner IF of 950-2150MHz. The modulator output signal is fed to a transmitter which shifts the signal to operation frequency of 7-8GHz range. The exact value of the frequency and an output power (100 … 500 mW) is defined by a customer.The transmitter output is a waveguide flange or N-type connector or else the transmitter can be combined with antenna array of 26 dB gain in a monoblock. Receiving side equipment is a converter of 7-8GHz into satellite IF range signal. The converter is a block with waveguide or coaxial input or it can be combined with an antenna array in a monoblock. A digital DVB-S receiver can be used as a receiver/ When a lead-in cable length is rather long, IF can be of 70MHz or any other value. For converting IF of 70 MHz in satellite receiver range it is used an upconverter. A connection distance depends on parabolic antenna size and its quality (gain-to-noise-temperature). The transmitting and receiving antenna size is chosen when RRL project ready.
 
                                                  Main technical parameters:
   
                        • Video channels                                                             2…6
                        • Audio channels (mono)                                               4…12 
                        • Service link channels                                                  up to 4
                        • Input video                                                        SDI or CVBS PAL 
                        • Analog video nominal level, connector             1V, 75 Ohm, BNC
                        • Video frequency band                                                 6MHz
                        • Input audio nominal level                                             0 dB
                        • Input Impedance (symmetric input )                  600 Ohm, XLR 3pin
                        • Audio channel frequency band                              60…18000 Hz
                        • Signal/noise ratio in operation frequency range     no less 62 dB
                        • Nonlinear distortions                                               not more 0,3%
                       
                        Service link channels:
 
                        • Service channel frequency band                          300 Hz…7.5 KHz
                        • Input Impedance (symmetric input)                          600 Ohm
                        • Input nominal level                                                   0 dB+/-6dB
                        • Output nominal level                                                 0 dB+/-6dB
                        • Signal/noise ratio in operational frequency range       -47dB
                        • Nonlinear distortions                                            not more 1,5%  
 
Note: Analogous signal parameters depend on parameters of a receiver you use.

                                                            Modulator parameters:
 
                  • Digital format                                                                               4:2:0
                  • Compression technique                                                   ISO/IEC 13818 (MPEG-2)
                  • Data rate                                                                               6-12 Мbit/sec
                  • ADC resolution                                                                              9 bit
                  • Sampling frequency                                                                    13,5 MHz
                  • Modulation scheme                                                                QPSK, FEC 7/8
                  • Intermediate frequency (IF)                                             70 MHz or 950...2150
                  • IF level                                                                                 1 mW +/-15%
                  • Radio link frequency band                                                     no more 28 MHz
                  • Power supply                                                           220V, 50 Hz; +12V on request
                  • Power consumption                                                               no more 25W

                                                               RF  path:
 
                  • Operation frequency
                    (should be chosen when placing an order)                                 7-8 MHz
                  • Polarization type                                                                          linear
                  • Output power                                                                    100mW ...500mW
                  • Frequency band                                                                         28 MHz

Distance between the modulator and transmitting equipment (when using RG-6U cable) no more than 100m.
Distance between the receiving unit and the receiver (when using RG-6U cable) no more than 50m.
                
The following system can be built based on proposed equipment:
 
The system provides receiption/transmission of 2 analog video signals (PAL) or 2 digital signals (SDI format),
4 mono or 2 stereo audio and 4 duplex service link channels.
 

 
 

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27.10.12

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The Repeater MVDS. The company Radiofar produced repeaters for MVDS systems with frequency range: 10.7-11.5 GHz,   11.7-12.7 GHz,   12.75-13.25 GHz.  Read more... >>

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