ZHC518D Digital TV ExciterOverview: This product is
a newly developed digital TV exciter using software radio
technology. The digital TV excitation board using the built-in new
technology FPGA + DDS technology architecture, full patch
welding process and very few components ensure excellent product
quality reliability and performance consistency while obtaining
superior indicators. The device has 2 ASI inputs, 1 ASI
loop out, and 1 RS232 interface. Support built-in GPS module
(optional), support 2 IP inputs; fully support all working
modes covered by various digital TV standards, with GPS 10MHz and
1PPS input and output ports; support single frequency network,
satellite single frequency network and multi frequency network
Working mode; support linear and nonlinear adaptive correction,
nonlinear correction ACPR increase 12db (typical value), linear
correction in-band flatness correction gain 10db (typical value),
can improve the output performance of the transmitter. The
frequency range of the exciter is 30~960MHz, with excellent RF
output performance and frequency stability, and supports local and
remote configuration of modulation parameters. Stable and reliable
work, high-efficiency switching power supply, real-time display of
working parameters, the exciter adopts one 19 "standard aluminum
alloy chassis, which can be widely used in the production and
testing of digital TV broadcast network composition and set-top box
design, and suitable for all levels of TV
stations.Features: 1. The digital TV exciter board with
built-in brand new FPGA + DDS technology architecture,
superior performance, high reliability and good consistency. It
fully supports all working modes covered by various standards of
digital TV broadcast exciters, and supports single
/ multi-frequency network mode simultaneously supporting
multi-carrier and single-carrier.2. Supporting linear non-linear
self-adaptive correction pre-distortion function, advanced
self-adaptive algorithm, call the corresponding correction curve
according to the communication interface instructions, especially
optimized for multi-body high-efficiency power amplifier, the
correction effect is excellent.3. Built-in GPS module (optional),
supports 2 IP inputs, supports full duplex, single network
port simultaneously bidirectional transmission, supports automatic
switching of four input signals, mutual backup, and supports the
effective bit rate of all input code streams at the same time The
ability to test. When the effective bit rate of the main channel is
lower than the threshold value, it will automatically switch to the
next stream with the effective bit rate higher than the threshold
value and send an alarm, and the switching time is less than
1 second; the switching sequence is analogous, if all The
effective bit rate of the channel does not reach the threshold,
keep the original main channel broadcast, do not switch, and send
an alarm; when a bit rate of the channel is lower than the
threshold (settable), send an alarm; the exciter RF normal power
output when there is no code stream input.4. Excellent phase noise
and MER performance, MER≥48db5. RF frequency output range 30
~ 960MHz, 0.1Hz stepping, constant temperature crystal
oscillator, frequency stability up to 0.1ppm, support 10MHz
monitoring output, local oscillator monitoring output and RF
monitoring output6. Supporting transmitter output signal
monitoring, the accuracy of RF index output by transmitter MER
monitoring is not less than 40db, the accuracy of shoulder
monitoring is not less than 50db, and the error is not more than
2db.7. Adopt modular design concept, which is convenient for
long-term maintenance and upgrading.8. It has MLC and ALC control
functions, there is no shock pulse of power ON/OFF and it's using
power output slow rise function, which can protect the transmitter.
And there is whole machine and component level lightning protection
measures. Perfect protection measures can reduce equipment
damage.9. Supporting Web network management, with intelligent
network management and monitoring, and with external RS232, TCP
/ IP and other communication interfaces. It has real-time
detection of the working parameters of the exciter and computer
control software with perfect functions, and has self-diagnosis
function. It has various monitoring and alarm functions, various
technical parameters can be read through the front panel LCD
display.10. Using famous brand's high-quality switching
power supply which has protection measures such as over-voltage,
over-current, under-voltage, over-temperature, short circuit,
anti-lightning strike, etc., it has high efficiency, good voltage
regulation range, and strong ability to adapt to external power
changes.11. Adopt high-resolution LCD screen and multi-button
design to make the exciter compact in structure and beautiful in
appearance.ZHC518D Digital TV Exciter Principle
Diagram: Technical Specifications: RF output1. Working
frequency band: VHF / UHF2. Outpu
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