 For the digitization of broadcast television, we designed this point-to-point digital microwave equipment, smart series (4/8/17/34Mb) with high cost-effective. This series equipment is a narrow-band point-to-point digital microwave transmission system, can transmit 4/ 8 sets of stereo broadcasting within the Bandwidth 7/14MHz at the same time. Made by large amount of import components, the equipment is small in size, light in weight, fast in construction, easy in maintenance and cost-effective etc. The whole equipment is mainly composed of microwave antenna, outdoor unit (ODU), indoor unit (IDU) and system cables. ODU is the transreceiver , 7 - 18GHz frequency coverage range; IDU integrates encoding, multiplexing, modulation (demodulation, demultiplex, decoding); Interconnection only with a coaxial cable, up to 300 meters in length, auto-balance transmission characteristics.
technical characteristics:
?? Large-scale FPGA chip technology, high system integration and reliability.
?? Professional A/D (D/A) chips to ensure good audio indicators.
?? On-chip system integrating technology, the stereo encoder and QPSK modulator combined organically.
?? Demodulator adopts advanced balance technology to ensure low threshold reception.
?? Providing a monitor output for each channel facilitates maintenance.
1performance parameter
|
item |
Smart audio series |
|
frequency band(GHz) |
7 |
8 |
13 |
15 |
18 |
11 |
|
frequency range(MHz) |
7125-7725 |
8275-8500 |
12750-13250 |
14450-15350 |
17700-19700 |
10700-11700 |
|
channel spacing(MHz) |
7/14 |
|
|
frequency stability |
10ppm |
20ppm |
|
transmitting power(dBm) |
+27 |
+25 |
+17 |
|
Noise coefficient(dB) |
4.5 |
5.5 |
|
Modulating mode |
QPSK |
|
Operating condition |
ambient temperature:IDU 0drges -+45drges (guaranteed range)
-5drges - +50drges (normal operating)
ODU -30drges -+55drges(guaranteed range)
-35drges- +60drges (normal operating)
relative humidity:IDU 90%(+25drges,no condensate)
ODU 100%
altitude: 5000m |
|
Power consumption |
40W(1+0system) |
|
power source |
DC-48V(-36V --72V DC) |
|
EMC |
conforming to YD1138-2001 |
2analog audio specification
|
item |
transmit end (input) |
receive end (output) |
|
audio bandwidth |
20Hz - 20kHz |
|
I/O impedance |
600??balance |
<60??balance |
|
Maximum I/O level |
+6dBm |
+20dBm |
|
frequency-amplitude characteristic |
20Hz -20K Hz 0.4 dB |
|
no-load signal to noise ratio |
S/N 70dBm |
|
distortion |
THD 0.2%(1KHz,input level +4dBm |
THD 0.3%(1 K Hz ,+4dBm) |
|
Stereo additional specification |
R\L track level difference:0.3 dB
R\L track phase difference:2 |
|
audio interface |
standard | |
