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DFT-72XX FM stereo broadcast transmitter
Outline
DFT-72XX series products are Dexin’s newest generation of FM stereo Broadcast Transmitter with low and medium power.
It adopts advanced third generation of FM modulation technologies: digital signal processing (FPGA) and digital frequency synthesis technology (DAC). DFT-72XX series transmitters take use of the advantage of audio processing technology to provide users a CD quality hearing experience with high linear and high gain LDMOS tube amplifier module.
Key Features
* Fully complying with national standard (GB/T4311-2000) and industrial standard (GY/T169-2001)
* Adopt high gain and high linear LDMOS tube amplifier module design
* Adopt international advanced signal processing technology (FPGA) for audio encoding
* Support AGC function with sustained power output (±0.1dB) to ensure the transmitter a good stability and reliability
* Adjustable output power as needed (10W～10kW)
* Low power consumption and super linear design to improve the transmission power, and reduce the nonlinear distortion
* LED on the front panel supporting alarm and signal monitor
* High-efficiency power supply with wide range of voltage (AC100～264V), suitable for different working condition
* Equipped with multiple lightning protection measures
* Support fault self-diagnosis and self-protection
* Air-cooled system with low consumption and low noise
* Multi lightning protection measures, good protection for whole equipment
* Full digital front panel control, easy operation
* 24-hour working unmanned, user friendly design
* Two Transmitters can be connected simultaneously by Coaxial switch, and one for back up
Technical Specifications
|
S/No. |
Item |
Unit |
Technical Index |
Remark |
||
|
1 |
Output Power |
W |
500 |
|
||
|
2 |
Frequency |
MHz |
1kW≤ |
65.5~87; 87~108 |
|
|
|
1kW＞ |
87～108 |
|||||
|
3 |
Frequency deviation |
Hz |
≤500 |
|
||
|
4 |
Sparious Radiation |
dB |
≤-70 |
|
||
|
5 |
parasitic amplitude modulation noise |
dB |
-60 |
|
||
|
6 |
Pilot frequency deviation |
Hz |
±1 |
|
||
|
7 |
S signal 38kHz Residual component |
dB |
＜-40 |
|
||
|
8 |
Deviation (100% modulation) |
kHz |
±75 |
|
||
|
9 |
pre-emphasis |
µs |
50 |
|
||
|
10 |
Distortion (100% modulation) |
L |
％ |
＜0.2 |
|
|
|
R |
||||||
|
11 |
Frequency response (without emphasis, de-emphasis) |
L |
dB |
±0.2 |
|
|
|
R |
||||||
|
12 |
Frequency response (with emphasis, de-emphasis) |
L |
dB |
±0.2 |
|
|
|
R |
||||||
|
13 |
SNR (100% modulation) |
L |
dB |
≥75 |
|
|
|
R |
||||||
|
14 |
L/R Separation |
L R |
dB |
＞70 |
|
|
|
R L |
||||||
|
15 |
L/R level diffrence |
dB |
＜0.1 |
|
||
Specifications and Environment Conditions
|
Item |
Item |
Technical Requirements |
Remark |
|
|
Output and Input Specifications |
RDS input |
BNC interface(57KHz) |
|
|
|
Input interface |
XLR, AES/EBU(Optional) |
|
||
|
Output interface |
L29-50K |
|
||
|
Environment condition |
Working temperature |
-20～+50℃ |
|
|
|
Storage temperature |
-30～+75℃ |
|
||
|
Relatively humidity |
＜95% (25℃ no condensation) |
|
||
|
Cooling mode |
inside forced air cooling |
|
||
|
atm press |
86～106kPa |
|
||
|
power supply |
AC, 100～264V/50Hz |
|
||
|
machine room |
Less dust, shock-free |
|
||
|
Demission (L×W×H) |
10~30W |
482×420×44mm |
|
|
|
100W |
482×420×88mm |
|||
|
300~1kW |
482×560×176mm |
|||
|
3kW |
600×800×1080mm |
|||
|
5kW |
600×1050×1695mm |
|||
|
10kW |
650×1050×1695mm |
|||
System Principle
Order Information
|
DFT-7211: 10W |
DFT-7212: 100W |
DFT-7213: 1kW |
DFT-7214: 10kW |
|
DFT-7231: 30W |
DFT-7232: 300W |
DFT-7233: 3kW |
|
|
DFT-7251: 50W |
DFT-7252: 500W |
DFT-7253: 5kW |
