DTV Modulator(Exciter)
MODEL: GME3DE10
Specifications：DTV Modulator(Exciter) Professional used for scientific experiments or particle acceleration, etc.
Frequency: UHF/VHF
Outputpower:≥1w
Product introduction：GME3DE10B DTMB exciter supports DTMB/DVB-T/DVB-T2 standard in all modes, and implements the conversion from the baseband TS input data to VHF or UHF terrestrial digital TV broadcast RF signal .
Overview
GME3DE10 Modulator( exciter) supports DTMB、DVB-T/T2 standard in all modes,, and implements the conversion from the baseband TS input data to VHF or UHF terrestrial digital TV broadcast RF signal which meets DTMB/DVB-T/DVB-T2 standard. It mainly consist of the baseband processing, digital to analog conversion, frequency synthesizer, RF signal amplification, monitoring system and other functional modules, featured with simple circuit, good performance, stable and long-time continuous operation.
Features
1)Support DTMB/DVB-T/DVB-T2 standard in all modes and meet all requirements of the standards.
2)Use adaptive digital pre-correction multi-dimensional non-linear pre-distortion and precision demodulation technology, with high-precision, fully automatic and adaptive linear and nonlinear pre-correction function.
3)Unique dual feedback input ports, which can simultaneously sample the output signals after the final-stage power amplifier and after band pass filter to achieve the pre-correction to PA linear/nonlinear distortion and passive components linear distortion at the same time, to further improve the quality of transmitting signal.
4)Real-time monitoring of output signal quality, and can automatically start pre-correction processing to ensure optimal working state when transmission system performance degrades.
5)Use direct digital RF broadband automatic balancing technology to achieve near-perfect modulation and frequency conversion, with MER greater than 40 dB, signal shoulder less than -60dBc, spurious inside and outside adjacent channel less than -55dB and -61 dB respectively, and superior phase noise performance.
6)Use adaptive output impedance matching technology to ensure impedance matching at the output end.
7)Support system-level AGC (automatic gain control) function to ensure the output power stability of the transmission system.
8)Real-time, continuous, automatic and high accuracy measurement of MER and shoulder level of final-stage PA system without additional hardware overhead, and provide local display, serial ports / network transmission function for remote M&C, greatly facilitate the on-site monitoring of the transmitted signal and provides a good foundation for unattended transmission system.
9)In MFN mode, it has the following superior functions: real-time input stream rate display, built-in bit rate adaptive module, and high-precision PCR correction.
10)Real-time monitoring and display of the temperature inside the machine, as well as over-temperature protection.
11)Rich, intuitive and open user interface, supporting RS485 external control interface and provide a complete portfolio of communication protocols to facilitate the integration of transmission system.
12)Support remote upgrade via RJ45 port to complete the exciter system upgrades.
1 | Ambient temperature | Normal operation: 5-45℃ Permitted operation: 0~50℃ |
2 | Relative humidity | Normal operation: ≤90%（20℃） Permitted operation: ≤95%（Non condensation） |
3 | Atmospheric pressure | 86kPa-106kPa |
4 | Power supply | 110V～220V AC; 50Hz-60Hz。 |
5 | Dimension | 482.6mm（D）*500mm（W）*44mm（H） |
No. | Item | Technical Parameter | |
1 | Frequency | VHF/UHF | |
2 | Frequency step size for SFN | 0.25Hz | |
3 | Frequency accuracy | MFN mode:≤±100Hz SFN mode:≤±1Hz | |
4 | Output power | 0dBm | |
5 | Output power stability（24 hours） | ±0.1dB | |
6 | Roll-off factor | 0.05 | |
7 | Shoulder attenuation（fc±3.2MHz） | -50dBc | |
8 | Inband inflatness (fc±2.591MHz) | ±0.2dB | |
9 | Outband spurious | Unwanted emission inside the adjacent channel | 50dB lower than inband useful emission |
Unwanted emission outside the adjacent channel | 55dB lower than inband useful emission | ||
10 | Phase noise | -65dBc/Hz @10Hz -80dBc/Hz @100Hz -90dBc/Hz @1kHz -100dBc/Hz @10kHz -115dBc/Hz @100kHz -125dBc/Hz @1MHz | |
11 | PAPR | Meet CCDF curve mask of GB/T 28436-2012 | |
12 | MER | 40dB | |
13 | Range of SFN delay adjustment | 0-999.9999ms | |
14 | Step size of SFN delay adjustment | 100ns | |
FM Modulator(exciter)
MODEL: GME3F31
Specifications：FM Modulator(Exciter) Professional used for FM transmitter.
Frequency: 87MHz~108MHz
Outputpower:≥30w
Product introduction:The GME3F31 30W all solid state stereo FM radio exciter is a new product independently developed and designed by Beijing Duoyang Jizhao Technology Co., Ltd. It considers standardization and serialization in appearance and structure, as well as aesthetic effects and practicality. It has stable and reliable performance, advanced technology, simple operation, and convenient maintenance.
Overview
The circuit part of this exciter mainly consists of modules such as the main board (realizing FM stereo coding, FM modulation, display and control, and external communication functions), OLED display screen, LED fault display, input button board, switch voltage regulator, fan, and power amplifier.
Features
The FM exciter can achieve full digital processing (1000MHz D/A converter) of 87-108MHz FM signals from audio input to output. This system has flexibility, compatibility, and high performance indicators. Mainly manifested in the following aspects:
By using a 1000MHz D/A converter, RF output from 87MHz to 108MHz can be directly achieved. The output frequency resolution can reach 48 bits (1uHz). Frequency stability<10-6 when working independently;
(Internal temperature compensated crystal oscillator), frequency stability<10-8 during synchronous operation (GPS locked);
From audio sampling to RF output, the entire (binary) numerical operation is above 16 bit precision and 40 bit accumulator tail processing;
Equipped with digital audio signals (AES/EBU), left and right channel analog signals, and SCA input interfaces;
The frequency offset can be adjusted digitally, with an accuracy of up to 0.01%.
Adopting a new type of OLED display, it is clearer and has a longer lifespan than LCD displays.
Frequency： 87.00MHz ~ 108.00MHz , Step 10kHz
Frequency stability： < 10-8 （GPS）
< 10-6 （Internal）
Frequency Offset： 0～112.5kHz，Step 0.5Hz
Output power： 30W
Frequency Response： ±0.05dB, 30Hz~15KHz
Signal-to-Noise ratio： ≥75dB
Audio Distortion： < 0.03%, 30Hz ~ 15KHz
Resolution： > 55dB, 30Hz ~ 15KHz
Pilot Frequency： 19kHz 0.5Hz
Audion Input： -10.5dB ~ +10.5dB
Input Interface： L, R/AES/EBU
SCA Input： -2dB ~ +16dB
Audio Pre emphasis： 0us, 50us, 75us
CDR Modulator（Exciter）
MODEL: GME3FR10
Specifications：CDR Modulator(Exciter) Professional used for digital FM Broadcasting.
Frequency: 87~108MHz
Outputpower:≥30w(Anologue)
Product introduction：The GME3FR10 FM frequency band digital audio broadcasting exciter is a completely independently developed exciter by Beijing Duoyang Jizhao Technology Co., Ltd., which complies with the GY/T 268.1-2013 “FM frequency band digital audio broadcasting Part 1: Digital broadcasting channel frame structure, channel coding and modulation” (CDR) standard and supports in band simulcasting of FM broadcasting digital and analog signals. This exciter is a new product developed with standardized and serialized appearance and structure, as well as aesthetic effects and practicality. The overall performance is stable and reliable, technologically advanced, easy to operate, and easy to maintain.
Overview
The main circuit of GME3FR10 exciter includes core motherboard (implementing CDR standard coding and modulation, analog frequency modulation, digital analog signal baseband mixing, pre distortion correction, display and control, and external communication algorithm implementation), backplane (external interface circuit and related control interface circuit), frequency conversion board (up conversion TX, down conversion RX, loop and power control), color touch display screen, LED fault display, switch stabilized power supply, fan, and power amplifier modules.
Features
By using a 1000MHz D/A converter, RF output from 87MHz to 108MHz can be directly achieved. The output frequency resolution can reach 32 bits (0.1Hz). Frequency stability<10-8 when working independently;
When using an external GPS10MHz reference source for synchronous operation, the frequency stability is less than 10-9;
It has digital audio signal (AES/EBU), left and right channel analog signal interfaces, and the entire (binary) numerical operation from audio sampling to RF output is at least 24 bit precision and 40 bit accumulator tail number processing;
Equipped with IP and ASI digital audio input interfaces, the input stream complies with DRA (DRA+) standards;
Adopting a color touch screen display, it is clearer and more convenient to operate than an LCD screen.
No. | Working Mode | Content | Technical Parameter | ||
Digital | Analog+Digital | ||||
1 | * | * | Stepped Frequency | MFN | ≤1kHz |
SFN | ≤1Hz | ||||
2 | * | * | Frequency Stability | Internal clock source | ≤1×10-7 |
External clock source | ≤1×10-9 | ||||
3 | * | * | Frequency Accuracy | MFN | ±100Hz |
SFN | ±1Hz | ||||
4 | * | * | Phrase Noise | ≤-60dBc/Hz @10Hz | |
≤-75dBc/Hz @100Hz | |||||
≤-85dBc/Hz @1kHz | |||||
≤-95dBc/Hz @10kHz | |||||
≤-110dBc/Hz @100kHz | |||||
≤-115dBc/Hz @1MHz | |||||
5 | * | * | Load adaptability | Reflection loss≥26dB（Normal work） | |
reflection loss≥20dB（Allow work） | |||||
6 | * | Spectrum template | conform to GY/T 268.1-2013 | ||
7 | * | * | In band spectrum compliance | ≤1dB | |
8 | * | Power uniformity between sub bands | ≤0.3dB | ||
9 | * | Shoulder | ≤-40dB | ||
10 | * | * | Out-of-band spurious | Unused transmission power within adjacent channel bands | ≤-50dB |
Unused transmission power outside the adjacent channel band | ≤-60dB，≤1mW（87MHz below） | ||||
≤-60dB，≤5mW（87MHz～108MHz） | |||||
≤-60dB，≤1mW（108MHz above） | |||||
11 | * | * | RF output power stability | ±0.5dB | |
12 | * | peak-to-average power ratio | Conform CCDF | ||
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