Product
Digital TV Broadcast Transmitter -Indoor
Schematic Diagram
The RA500T series transmitters adapt the working mode of frequency conversion or wireless repeat. Firstly it receives TV program in form of AV signal which has been modulated into IF carrier signal, and then output the signal through 50Ω/L29 base; when it’s working, the signal is transmitted to transmitting antenna through RF jump wire(output filter can be added between transmitter and antenna if necessary). All the parts, systems involved in working, regular power supply, lighting protections guarantee the transmitter stable and continuous operational capacity.
This transmitter apply blind receiving setup, when user check the transmitter in accordance with agreed parameters, in assemble site only needs to connect power and signal, after swith on and making some adjustment, it can take into effective without any other adjustment.
This transmitter is compatible with digital and analog signal, compliant to IF carrier with multiple modulation modes like QPSK、64QAM、32QAM、16QAM、COFDM, however, due to the demodulation threshold difference in each modulation mode, thus exists output RF power difference in one same transmitter, as for modulation mode, it has been modulated when leaving factory, so there is no need to modulate again when use it, if needs to change the modulation mode, only can be used after modulation by RAZZO.
Digital Average power: 500W（AVG）
Shoulder Ratio（dBc）: ≥40 64QAM modulation
≥30 QPSK modulation
≥36 COFDM modulation
RF output frequency： 582～654MHz (frequency band carrier signal
takes could be set arbitrarily)
RF output interface 50Ω/L29K connector, return loss＞21dB
RF frequency response Passband fluctuation： ±1.0dB
Group delay characterictic : ≤40nsec
IF input level : -13～-9dBm
IF input frequency: 582～654MHz \ 718~868MHz
IF input interface: 75Ω/F connector, Return loss ＞15dB
In-band Spur Restraint : ≤-60dBc(relative digital signal level)
Out-band Spur Restraint: ≤-65dBc(relative digital signal level)
Auto level control : 4dB
Output power variation: ±0.2dB
Gain adjustment: ≥31dB
Gain adjustment error: 0～10dB，≤±0.5dB
10～20dB，≤±1.0dB
20～31dB，≤±1.5dB
Environmental condition Working temperature： -20℃～+50℃；
storage temperature： -30℃～+75℃.
humidity：no condensation; relative humidity： 0～95%
Nosaturation (25℃ no condensation),
atmospheric pressure: 86-106kPa
Working voltage: AC 180V-260V,50/60Hz,
Power consumption: ≤2500W