Encoder Modulator Decoder Demodulator Module Mga Tagubilin sa Pag configure ng COFDM AT Command
Encoder Modulator Decoder Demodulator Module Mga Tagubilin sa Pag configure ng COFDM AT Command
Download the Encoder Modulator Decoder Demodulator Module Parameter Configuration Instructions below if you need a PDF file.
Update Record:
| Bersyon | Petsa | Description |
| 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 | 2016-10-24 2016-11-1 2016-12-26 2017-2-14 2017-2-28 2017-3-27 2017-4-19 2017-5-18 2017-9-12 2018-3-15 2019-6-25 2023-2-24 | Initial version ATDR reply distinguishing module ATSE, ATGE add audio switch Add ATSP protocol Add ATST, ATGT protocol ATGE command add AESfor status acquisition Added ATGB protocol AV and HDMI output control Support for obtaining the current AV output standard Added ATSU, ATGUcommands Added ATOSD, ATSIP, ATGIP commands Added ATSAD, ATGAD commands |
Users may need to modify the configuration parameters of the module during the use of the COFDM modulator and demodulator module. In order to simplify the user’s operation, we design the parameter configuration into a few simple AT commands. The user only needs to use the specified AT command and pass the corresponding parameters to complete the parameter setting of the COFDM module.
Suitable Models
-
COFDM Relay Repeater module para sa drone UAV wireless video transmiter at receiver Vcan1870 -
COFDM moduleitor Demodulator Module Encoder Decoder HDMI CVBS AV Input AES 256 FHD RF streaming -
Wireless Video Transmitter at Tatanggap para sa Camera, HDMI HD H265 264 encoder 1W/2.5W PA 1080P60 Vcan1726 -
HDMI Upang IP encoder modulator CVBS H.265 H.264 encoding board pcba Ethernet RSTP UDP para sa UAV Drone Robotic
Command Introduction
The AT command for configuring COFDM module parameters starts with “SA” and ends with an underscore “_”. Each AT command has several or no parameters, and each AT command has a return value. For details, please refer to the introduction of the following commands.
Users can configure the parameters of the module through the configuration serial port (TTL antas, 3.3T) of the COFDM module. For detailed serial port configuration, refer to the figure below. Please use tools such as “Serial Port Debugging Assistant” to send AT commands to the COFDM module, pay attention to the use of teksto, halimbawa:
Command Classification
The AT commands for configuring COFDM module parameters are mainly divided into the following two categories:
| Query Commands | ATDR, ATGD, ATGE, ATGI , ATGR, ATGT, ATGB, ATGU, ATGIP |
| Setting Commands | ATSD, ATSG, ATSM, ATSE, ATSI, ATSO, ATSR, ATSP, ATST, ATSU,ATOSD, ATSIP |
From the perspective of whether to save after power-off, the setting commands can be divided into:
| Power-off Saving Commands | ATSD, ATSE, ATSI, ATSO, ATSR, ATSP, ATST, ATSU, ATSIP |
| Power-off Not Saving Commands | ATSG, ATSM, ATOSD |
According to the configuration transmitter or receiver, the classification is as follows:
| Sender Configuration Commands | ATDR, ATSD, ATGD, ATSG, ATSM, ATSE, ATGE, ATSI, ATGI, ATSO, ATSP, ATST, ATGT, ATSU, ATGU, ATOSD |
| Receiver Configuration Commands | ATDR, ATSR, ATGR, ATSP, ATST, ATGT, ATGB, ATSIP, ATGIP |
Command Details
Ping Command
| Format | ATDR_ |
| Parameter | Hindi |
| Paggamit | for the integrated system to check whether the serial port is connected and identify the connected modules. |
| Ibalik ang halaga | RCB returns the “device profile” string SUE1 returns “ATDRSUE1 OK” string SHD1 returns “ATDRSHD1 OK” string |
| Pananalita | utos ng query |
Set Device Command
| Format | ATSD $(mimo), $(gi), $(code_rate), $ (constellation), $(sariwang(KHz)), $(bw(KHz)), $(tx1_gain), $(tx2_gain)_ Halimbawa: ATSD0,1,0,0,800000,8000,86.0,86.0_ |
| Parameter | One Antenna/Dual antenna mimo: 0 mimo disable; 1 mimo enable Guard Interval GI: 0 1/32; 1 1/16; 2 1/8; 3 1/4 Convolution Code Rate: 0 1/2; 1 2 /3; 2 3/4; 3 5/6; 4 7/8; Konstelasyon: 0 QPSK; 1 QAM16; 2 QAM64; RCB Carrier Center Frequency(kHz) 200000~2700000(200MHz~2.7GHz, 1KHz hakbang) RC900 Carrier center Frequency(kHz) 750000~930000(750MHz ~ 930MHz, 1KHz hakbang) RCB Channel bandwidth bw(KHz) 2000~8000(2MHz~8MHz, 1KHz hakbang) RCB Channel bandwidth bw(KHz) 2000~8000 (2MHz~8MHz, 1KHz hakbang) Transmitting antenna 1 gain tx1_gain 0.0~89.75dB, 0.25dB stepping Transmitting antenna 2 gain tx2_gain 0.0~89.75dB, 0.25dB stepping |
| Return Value | tulad ng:ATSD0,1,0,0,800000,8000,86.0,86.0_ SISO,GI GI: 1/16, CR:1/2, MOD: QPSK, sariwang:800000KHz,bw:8000KHz,tx1_gain:86.000000 tx2_gain:86.000000 OK |
| Tala | Set command, save when power off. Different Bandwidths, Guard agwat, Convolution code rates, Data rate calculation formulas corresponding to constellations Air interface rate Rate(Mga MBP) = (BandWidth(MHz) * 8.0/7.0) / (1+GI GI) * 1512/2048*mag-log2(konstelasyon punto) * code_rate * 188/204. Taking 8MHz bandwidth as an example, different guard intervals, convolution code rates, data rates corresponding to constellations and required receiving signal-to-noise ratios  |
Set Gain Command
| Format | ATSG$( tx1_gain),$( tx1_gain)_ Halimbawa: ATSG85.0,85.0_ |
| Parameter | tx1_gain: Transmiter 1 makakuha ng tx2_gain: Transmiter 2 makakuha ng |
| Paggamit | To dynamically adjust the output power. If the signal SNR/RSSI of the receiver is high, the output power can be reduced through the remote control link. When the SNR/RSSI of the end signal is low, increase the output power (transmiter) |
| Return Value, | Halimbawa: ATSG85.0,85.0_set gain 85.000000 85.000000 OK |
| Pananalita | setting command, power off will not save. |
Set Modulation Mode command
| Format | ATSM$(gi), $(code_rate), $(constellation)_ Halimbawa: ATSM1,1,2_ |
| Parameter | Gard interval GI: 0 1/32; 1 1/16; 2 1/8; 3 1 /4; Convolution code rate: 0 1/2; 1 2/3; 2 3/4; 3 5/6; 4 7/8; Konstelasyon: 0 QPSK; 1 QAM16; 2 QAM64 |
| Paggamit | Dynamically adjust the air interface rate, the air interface rate can be increased when the distance is short, and the air interface rate can be reduced when the distance is long (transmiter) |
| Return Value | Halimbawa:ATSM1,1,2_GI:1/16, CR:2/3, MOD: QAM64, OK |
| Pananalita | setting command, power off will not save. |
Get Device Status Command
| Format | ATGD_ |
| Parameter | Hindi |
| Paggamit | query the current number of transmit antennas, bantayan ang mga interval, convolution code rate, number of constellations, transmit frequency, bandwidth, gain parameters (transmiter) |
| Return Value | Halimbawa: ATGD_ SISO, GI GI:1 /16, CR: 1/2, MOD: QPSK, sariwang: 800000KHz, bw: 8000KHz, tx1_gain: 86.000000 tx2_gain: 86.000000 OK |
| Pananalita | utos ng query |
Set Encoder Command
| Format | ATSE$(llc),$(rt),$(bitrate) ,$(gop),$(audio)_ Halimbawa: ATSE0,0,0.0,0,0_ |
| Parameter | 1. Enhanced data reliability option llc: 0 disable; 1 enable (requires the receiving end to enable this option at the same time, use in pairs, because more redundant data is added to enhance reliability, the video bit rate of the transmitting end should be set when this option is turned off half of) 2. Real-time priority/quality priority rt: 0 image quality priority; 1 real-time priority; 3. bitrates: 0 let system decide; >0 specify bitrate(float) 4. I frame interval GOP: 0 let system decide; >0 specify GOP 5. Audio encoding option audio: 0 disable; 1 enable |
| Paggamit | Used to set encoding parameters (Transmiter) |
| Return Value | Halimbawa:ATSE0, 0,0.0,0,0_ NA MODE:0,RT:0,bitrate: 0.0Mbps,gop:0,audio:0,OK |
| Pananalita | setting command, save when power is off. |
Get Encoder Command
| Format | ATGE_ |
| Parameter | Hindi |
| Paggamit | querying encoding parameters (sending end) |
| Return Value | Halimbawa:ATGE_MODE:0, RT:0,bitrate:4.0Mbps,gop:10,audio:0,aes:0, OK |
| Pananalita | Query command AES means the current encryption status: 0 disable; 1 enable |
Get Input Command
| Format | ATGI_ |
| Parameter | Hindi |
| Paggamit | query the current camera input parameters (transmiter) |
| Return Value | Halimbawa:ATGI_input_size: 1080p, input_rate: 60FPS, sensor_type: hdmi,OK |
| Pananalita | utos ng query |
Set Input Command
| Format | ATSI$(input_size),$(input_rate)_ Halimbawa: ATSI1080,25_ |
| Parameter | 1. Input resolution input_size: 0 let the system detect; >0 specify input size 2. Input frame rate input_rate: 0 let the system detect; > 0 specify input fps |
| Paggamit | To specify the input resolution and frame rate to meet some special signal sources, or some special application needs (transmiter) |
| Return Value | Halimbawa: ATSI1080,25_ Input_size:1080p,input_rate: 25FPS, OK |
| Pananalita | After the user specifies the input resolution and frame rate through this command, the system will no longer detect the signal source (use with caution). The user can restore the default through the following command: ATSI0,0_Set the command and save it after power-off. |
Set Output Command
| Format | ATSO$(output_size),$(output_rate)_ Halimbawa: ATSO720,30_ |
| Parameter | 1. Transmiter: encoding output resolution output_size: 0 equal to input_size; >0 specify output size 2. Receiver: HDMI output resolution (720, 1080) 3. Transmiter: encoding output frame rate output_rate: 0 equal to input_rate; >0 specify output_rate (FPS) 4. Receiver: HDMI output frame rate 720p supports frame rate (50, 60); 1080p supports frame rate (24, 25, 30, 50, 60) |
| Paggamit | 1. Transmiter: Used to specify the encoding output resolution and frame rate to meet the requirements of certain applications for zooming and frame reduction 2. Receiver: used to configure the resolution and frame rate of HDMI output |
| Return Value | Halimbawa: ATSO720,30_ output_size: 720p, output_rate: 30FPS, OK |
| Pananalita | 1. For HDMI input only, this command is invalid for AV input 2. Output_size <= input_size; output_rate<=input_rate 3. Set the command and save it after the power is off. |
Set Input Sources Command (switch HDMI / Input ng CVBS)
| Format | ATSU$(vin),$(ain)_ Halimbawa: ATSU0,1 _ |
| Parameter | 1. Video input selection VIN: 0 let the system detect; 1 force CVBS input; 2 force hdmi/SDI input 2. Audio input selection AIN: 0 let the system detect; 1 force analog input |
| Paggamit | Used to meet specific application requirements (Halimbawa: HDMI/SDI input video, MIC input audio) |
| Return Value | Halimbawa: ATSU0,1_ ATSU0,1 OK |
| Pananalita | setting command, power-off save. |
Get User Command
| Format | ATGU _ Halimbawa: ATGU_ |
| Parameter | Hindi |
| Paggamit | To query user-specific configuration |
| Return Value | Halimbawa: ATGU_ ATGU0,1 OK |
| Pananalita | utos ng query return parameter description please refer to the ATSU command |
Set Receiver Command
| Format | ATSR $(sariwang), $(bw ), $(llc), $(cvbs)_ Halimbawa: ATSR320000,6000,0,0_ |
| Parameter | 1. DR2C carrier frequency freq(KHz) 200000~860000(200MHz ~ 860MHz, 1KHz hakbang) 2. DR900 carrier center frequency freq(KHz) 200000~1600000(200MHz~1.6GHz, 1KHz hakbang) 3. DR2C channel bandwidth bw(KHz) 2000~8000(2MHz~8MHz, 1KHz hakbang) 4. DR900 channel bandwidth bw(KHz) 3200~8000(3.2MHz~8MHz, 1KHz hakbang) 5. Enhanced data reliability option llc: 0 disable; 1 enable (it is required that the transmitter should also enable this option at the same time, and use it in pairs. Since more redundant data is added to enhance reliability, the video bit rate of the transmitter should be set to when this option is turned off half of) 6. AV output system cvbs: 0 pal; 1 ntsc |
| Paggamit | To set the receiver parameter |
| Return Value | example: ATSR320000,6000,0,0_ ATSR320000,6000,0,0 OK |
| Pananalita | setting command, save when power is off. |
Get Receiver Command
| Format | ATGR_ |
| Parameter | Hindi |
| ATGR_ | the receiving end parameter |
| Return Value | Halimbawa: ATGR_ ATGR320000,6000,0,aes:0,cvbs:0 OK |
| Pananalita | 1. Query command 2. Aes parameter indicates the current encryption status: 0 disable;1 enable 3. CVBS parameter Indicates the current AV output standard: 0 pal;1 ntsc |
Get Bit Error Rate Command
| Format | ATGB_ |
| Parameter | Hindi |
| Paggamit | querying the bit error rate and signal strength of the dual antennas at the receiving end |
| Return Value | Halimbawa: ATGB_ ATGB ber1:0.00% ber2:0.00% RSSI1 :54 RSSI2:53 Lock1:1 Lock2:1 OK |
| Pananalita | 1. Query commands 2. Ber1 and ber2 respectively indicate the bit error rate of each antenna, ranging from 0.0% upang 100.0% 3. RSSI1 and RSSI2 respectively indicate the signal strength of each antenna, ranging from 0 upang 100 4. Lock1 and Lock2 respectively indicate the signal locking status of each antenna (1 Represents signal lock) |
Set Password Command
| Format | ATSP$(password), $(password)_ Halimbawa: ATSP123456, 123456_ |
| Parameter | AES key password: 6-digit password (ASCII) AES key password: 6-digit password (ASCII) (repeat it for confirmation) |
| Paggamit | Used to set the AES key of the transceiver (transmiter at receiver) |
| Return Value | Halimbawa: ATSP123456_ ATSP123456 OK |
| Pananalita | 1. When the password is all 0, AES encryption is turned off. 2. Set the command and save it after powering it off. |
Set Data Transfer Command
| Format | ATST$(baud rate), $( parity)_ Halimbawa: ATST115200,0_ |
| Parameter | 1. Baud rate baud rate: 1200、2400、4800、9600、19200、38400、57600、115200 2. Check Code: 0: Wala; 1: Odd; 2: Even |
| Paggamit | Used to set the baud rate and parity bit of the serial port for data transparent transmission |
| Return Value | Halimbawa: ATST115200,0_ ATST115200,0 OK |
| Pananalita | Set command |
Get Data Transfer Command
| Format | ATGT_ |
| Parameter | Hindi |
| Paggamit | Used to query the baud rate and check code |
| Return Value | Halimbawa: ATGT_ ATGT115200,0 OK |
| Pananalita | Query command |
Set IP Address Command
| Format | ATSIP$(ip), $(ip)_ Halimbawa: ATSIP192.168.1.215,192.168.1.215_ |
| Mga Parameter | Local IP address Local IP address (repeat to confirm) |
| Paggamit | Used to set the receiver IP address |
| Return Value | Halimbawa: ATSIP_192.168.1 .215,192.168.1.215_ ATSIP192.168.1.215 OK |
| Pananalita | 1. After setting the IP address, the receiving end needs to be restarted to take effect. 2. Set the command and save it after powering it off. |
Get IP Address Command
| Format | ATGIP_ Halimbawa: ATGIP_ |
| Parameter | Hindi |
| Paggamit | upang mag query sa kasalukuyang IP address ng pagtanggap ng dulo |
| Ibalik ang halaga | Halimbawa: ATGIP_ ATGIP192.168.0.215 OK |
| Pananalita | utos ng query |
OSD Overlay Protocol
| Format | ATOSD$(idx), $(x), $(y), $(str)_ Halimbawa:ATOSD0,40,20,height: 100m_ |
| Parameter | 1. IDX index: 0~7 (supports OSD overlay for 8 areas) 2. X-coordinate: 0~1919 3. Y coordinate: 0~1079 4. str: the string to be displayed at the corresponding coordinates (the space symbol is used to clear the display) |
| Paggamit | on the video screen.OSD information |
| Ibalik ang halaga | Hindi |
| Pananalita | 1. The user specifies the x and y coordinates of the OSD display according to the maximum 1920×1080 pixel, and the system will correct the coordinates according to the actual display situation. 2. The ‘_’ character cannot be contained in the str parameter |
Set Gain To Adjust
| Format | ATSAD$(sariwang),$(adjust) _ Halimbawa:ATSAD700000,2.5_ |
| Parameter | wireless central working frequency： Freq(KHz) 200000~2700000(200MHz~2.7GHz, step: 1KHz) Adjust the value(dB): ATSD cmd will subtract this value to set the wireless gain |
| Function na | Specify and adjust the value for the wireless gain setting using by ATSD cmd |
| Feedback | Halimbawa: ATSAD700000,2.5_ freq:700000,adjust:2.50 OK |
| Mga Komento | Setting command is still valid when stopping power or resetting. |
Get Gain To Adjust
| Format | ATGAD[$(sariwang)]_ Halimbawa:ATGAD700000_ |
| Parameter | wireless central working frequency： Freq(KHz) 200000~2700000(200MHz~2.7GHz, step: 1KHz) When no parameter provides, it will list all the freq that have adjusted value. |
| Function na | Inquiry adjust the value for wireless gain setting using ATSD cmd |
| Feedback | Halimbawa: ATGAD700000_ freq:700000,adjust:2.50 OK ATGAD_ freq:700000 750000 OK |
| Mga Komento | Inquiry command. |
Serial Port Utility software download
https://www.alithon.com/downloads
FAQ
1. How can I return to the No Password setting with 000000 indications after the change?
Reset the password to 000000 (one must not be missing) through the Parameter Configuration Panel Board.
or set it through ang ATSP_command
2. I see that Gain is the output power of the transmitter. Please tell me the range of settings of this parameter. All setting level (Magkaroon ng) good for linear output operation? Or do you suggest some limited range for better linear operation?
The Gain of the COFDM configuration is the internal Gain, not the actual output power of the transmitter. The internal gain range is 0~89.75dB and the linear output:
1. At around 300~500MHz, the Gain is set to 89.75, and the actual output power of the transmitter module is about -5dBm.
2. At around 1000~1500MHz, the Gain is set to 89.75, and the actual output power of the transmitter module is about -6dBm to -10dBm.
3. I tried to set – B bandwidth (kHz) and E bit rate (Mbps). When I set E, the new value does not apply. Kaya nga. the E setting is only for monitoring of available bitrate? if I wish to change the E (bitrates) I have to change only B (bandwidth)? Am I right?
It is not recommended to modify the video bit rate ‘E’ directly, because if the output video bit rate is greater than the wireless air interface rate, the system will not work normally.
By default, the internal video bit rate ‘E’ will be set to 0 for automatic. Customers only need to modify ‘B’ to modify the wireless parameters, and the video bit rate will automatically adapt.
You can also adjust the wireless air interface rate by modifying GI and CR.
For more details on the Encoder Modulator Decoder Demodulator Module, please send an inquiry to us.
COFDM moduleitor Demodulator Module Encoder Decoder HDMI CVBS AV Input AES 256 FHD RF streaming
COFDM moduleitor Demodulator Module Encoder Decoder HDMI CVBS AV Input AES 256 FHD RF streaming
Talahanayan ng nilalaman
Isa pang side view
COFDM Encoder module, CVBS / Input ng HDMI, Output ng IP
Para sa Higit pang mga detalye tungkol sa COFDM encoder board, bisitahin mo na lang dito
COFDM Encoder module Advantage:
- Ultra-mababang latency H.265/H.264 audio at video encoding maximum na suporta 1080P@60 real-time video makuha at encoding
- HDMI o AV audio at video input, pagkatapos encoding, ang Ethernet port output o Output sa wireless module, video encoding bit rate ay maaaring dynamically configured
- Suportahan ang audio input at audio decoding output
- Suportahan ang dalawang video (HDMI+AV) sabay-sabay input encoding (opsiyon, ang default ay HDMI o AV encoding, pumili ng isa mula sa dalawang input sourcing). )
- Web UI o serial port UART AT command para sa pamamahala ng configuration
COFDM transmiter module
COFDM modulator-demodulator datasheet download
COFDM demodulator Vcan1776RX-H264 datasheet
Ang huling bersyon ng TX RX board
TX: V6.5.6p
RX: 4.1.2p
FAQS
- Tanong1: Pwede po bang sabihin ang part number ng component na ito, try namin maghanap ng localy at mag check. Ang sagot 1: Ito ay isang inductance na pinangalanang LOH32PN2R2NNC.
- Magmungkahi ng mga Check Point: Kung maayos ang power supply current ng board pero walang RF output, baka yung below component TC1-1-13MX+ ay karaniwang nasira.
- Upang maiwasan ang pinsala sa aparatong ito sa panahon ng transportasyon (ang aparato mismo ay medyo mataas), Nag order kami ng proteksyon ng Red Glue para sa aparatong ito nang ipadala namin ito.
- Iminumungkahi rin ng engineer na suriin mo kung maluwag ang cable o hindi maganda ang contact.
- Try nyo po palitan yung FPC cable na nag uugnay sa dalawang board
- We can provide spare parts if you're sure which one.
Siguradong
Paki check ang link sa ibaba.
Encoder Modulator Decoder Demodulator Module Mga Tagubilin sa Pag configure ng COFDM AT Command
3. Tanong, Kung ang quality ng camera natin ay sapat na para sa dalawa 4 MHz at 8 MHz na bandwidth. Sa kasong ito, Dapat bang pumili ang customer 4 MHz o 8 MHz?
Ang sagot: Ang aming mga one way na pagpapadala ng COFDM ay gumagamit ng 4Mz wireless bandwidth sa pamamagitan ng default, kaukulang sa isang video bit rate ng 3.12Mbps, alin ang sapat para sa 1080p; Kung binago sa 8MHz wireless bandwidth sa ilalim ng parehong mga kondisyon, ang video bit rate ay doble sa 6.24Mbps. Ang lahat ng mga customer ay maaaring pumili sa pagitan ng wireless bandwidth 4MHz at 8MHz, kahit 6MHz pwede din ituring.
4. Tanong: Alin ang mas mahusay para sa tx +rx set na ito mula sa isang makatanggap ng sensitivity view?
Ang sagot: Para sa mga wireless link, Maaari itong isaalang alang lamang na ang pagtanggap ng sensitivity ay magiging mas mataas sa mas mababang wireless bandwidths. Mula sa pananaw ng pagtanggap ng sensitivity, 4MHz>6MHz>8MHz
Siguradong
Paki check ang link sa ibaba
COFDM Relay Repeater module para sa drone UAV wireless video transmiter at receiver Vcan1870
Single channel na tumatanggap ng sensitivity:
-97+/-1DBM sa QPSK 8MHz,
-98+/-1DBM sa QPSK 6MHZ,
Sensitivity nadagdagan ng 3dbm kapag tumatanggap na may dual antennas
Ang receiver default firmware ay sumusuporta sa RTSP player, mas gusto ng ilang kliyente ang UDP player, na maaari rin nating ihandog, then RTSP player doesn't support. (RTSP at UDP ay maaari lamang pumili ng isa sa dalawang firmware)
Download lang po sa below link.
Splayer_v4.2_2020.6.6
https://drive.google.com/file/d/1ihzUhfnx2Wo3zLO8UAs1aUQeLswonJD-/view?usp=sharing
Splayer_v4.3_2022.10.22
https://drive.google.com/file/d/1PQc-LZ55qGnjeMsjkHYSloHfY3NEUsGH/view?usp=drive_link
Siguradong, Pakitingnan ang larawan sa ibaba.
Pa rin magkaroon ng isang katanungan?
Mangyaring makipag-ugnay sa amin para sa karagdagang impormasyon.
Ipadala ang Iyong Tanong
Paano lumipat ng HDMI o CVBS video input sa pamamagitan ng UART AT command?
Paano mag upgrade ng COFDM video receiver
Paano mag upgrade ng COFDM drone video encoder modulator board
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