Digital STL Audio & Video Transmission System
1. Functional overview:
The digital STL audio and video transmission system is a professional system which can transmit 4 stereo (or 8 mono) analog/digital audio signals and 1 digital video signal wirelessly from the studio to the transmitting station. The system uses state-of-the-art software-defined radio (SDR) technology, digital code modulation, digital demodulation and decoding to transmit and receive, enabling audio/video signals to be transmitted at very high quality and with virtually no damage.
One set of standard configuration STL system equipment has a transmission distance of 60 kilometers in line of sight. The transmission system consists of STL transmitter, transmission filter, transmitting antenna & feeder cables, receiving antenna & feeder cables and STL receiver.
The diagram as below:
2. Technical specifications:
Item |
Value |
General Technical Specifications | |
Working Frequency |
100MHz～1000MHz, continuously adjustable, stepping amount 10KHz |
Frequency stability |
2ppm |
Transmitting power |
2W @ shoulder >45dB, out-of-band spurious <-80dBc |
Modulation type |
Stereo audio signal 32QAM@1M; ASI signal 15MBit/S@5M |
Receive sensitivity |
32 QAM/-78dBm @80dB S/N |
Input/output audio signal |
Analog audio signal or digital audio signal (AES/EBU) |
Input/output video signal |
ASI |
Working temperature |
-10℃~+50℃ |
Audio Technical Specifications | |
Signal to noise ratio |
>85dB @1KHz,0dBm |
Distortion |
<0.05% @30Hz～15000Hz,0dBm |
Audio frequency response |
±0.1dB @30Hz～15000Hz,0dBm |
Left and right channel separation |
>80dB @30Hz～15000Hz,0dBm |
Video Technical Specifications | |
Band Shoulder |
>50dB |
MER |
>45 |
Power Demand | |
Power Supply Voltage |
90～260VAC full range |
Power Consumption |
50W |
Mechanical Dimensions | |
Transmitter |
19-inch standard chassis, height 2U |
Receiver |
19 inches, height 1U |
Cooling system |
forced air cooling, three anti-treatment |
Noise |
<50dB |
Input & Output | |
Audio Mono Analog Audio（MPX） |
-15dBm～+15dm，600Ω, XLR interface |
Audio stereo dual channel |
-15dBm～+15dm，600Ω, XLR interface |
Digital Audio AES/EBU |
-39dBFS～0dBFS，110Ω, XLR interface |
Digital Video ASI |
1Vp-p，BNC interface |
RF input and output interface |
N (Female) |
3. Ordering information (please inform the working frequency and transmission distance when ordering):
1. The STL transmitter and the STL receiver are continuously adjustable for operating frequencies from 100 MHz to 1 GHz;
2. Select the center frequency of the output filter according to the operating frequency;
3. Select the transmit and receive antennas according to the operating frequency (the antenna working bandwidth is 20MHz);
4. Select the length of the transmit and receive cables according to the distance between the transmitter and receiver and the antenna;
5. Flexible selection of input and output audio signals based on actual needs is analog or digital.
6. The ordering description as follows:
For example:
ZHC658T-1A3D/345.895
STL Transmitter (Input Signal: 1way Analog Audio + 3way Digital Audio, Central Frequency 345.895MHz)
ZHC658T-2D1S/758.975
STL Receiver (Output Signal: 2way Digital Audio + 1way ASI, Central Frequency 758.875MHz)
