COFDM Video Transmitter COFDM HD Wireless Composite Video Transmitter digital FPV VTX

20 PCS FPV Video Transmitter VTX
3 PCS FPV Video Receiver VRX
2PCS VTX Parameter Configuration Tool

2 cartons
45x37x27cm 9.03kg
89x13x12cm 2.02kg

 

 

 

COFDM HD Wireless Video Transmitter HDMI 1080P CVBS SD 720P

Feature

1. Working frequency can be adjusted from 170MHz ~ 930MHz
2. Video Audio interface: HDMI digital interface and analog CVBS composite inputs (_SDI input is coming soon)
3. High-quality digital video processing and H.264 / MPEG-2 video codec, HD quality
4. Very short coding delay of 500 milliseconds
5. High-speed mobile and multi-path interference stable transmission of images, video
6. Powerful NLOS capability
7. Having a diverse reception
8. With encryption
9. Default 1W transmit RF power, Develop different 1~5W
10. According to customer requirements, OEM or ODM is customized

Specification

1. Working frequency170MHz ~ 900MHz, be customized
2. Modulation method COFDM
3. RF Output power1~5W can develop more power
4. Bandwidth6/7/8MHz
5. EncryptionAES / AES2 / DES / DES2
6. Guard interval: 1 / 32,1 / 16,1 / 8,1 / 4

Technical Standards

H.264 / MPEG-2

Video stream

2Mbps ~ 25Mbps

System delays: <500ms

BER: ≤10-6

Transmission distance: 1 ~ 10km

Compression format: H.264 / MPEG-2

Video input: HDMI, Analog CVBS video, and audio

Audio input: Stereo, Right Left

Image definition: 1080P/I (1920×1080) is compatible with 720P, 480P, and SD @ frame rate of 25 frames/sec.

Video input interface: 3.5 mm headphone jack, HDMI

Audio input interface:3.5 mm headphone jack, HDMI

Power supply: VCC6V ~ 40V

Dimensions: 100mm × 43mm × 10mm (L × W × H)

Weight:0.2kg

FAQ

Q: What PA device would you use for a 5W amplifier?

A: RFPA3800DS

Q: We intend to use it for both UAVs and land drones.We can use a single receiver, and multiple transmitters, correct? If so, what are the default frequencies for some receiver?

A: Yes, it supports multiple transmitter and one receiver. The transmitter frequency supports 150-860Mhz customized for you. The default frequency is 595Mhz.

Q: Do we have the option of changing the frequency within the configuration settings?

A: Because of the transmitter includes transmitter board, power amplifier and transmitter antenna.The transmitter board frequency supports 150Mhz-6Ghz to change. But the power amplifier and transmitter, in order to increase the transmission range, the frequency range always focus one +/-15Mhz range.if you are used widely frequency range, the transmission range should be shorter. We will offer you the configuration board tool to change frequency.

Q: It’s possible that a separate frequency is used for each transmitter. However, the receiver might get their signals, such as a TV changing channels.

A: Yes, transmitter supports to customize 300 Mhz, 595 Mhz, or 700Mhz, but the transmitter frequency range is +/-15Mhz. The receiver supports to search from 170 to 860 Mhz range.

Q: Will I require separate antennas and power amplifiers for every frequency?

A: Yes. If you confirm, you need 300 Mhz, 595 Mhz and 700Mhz as a working frequency. Then we will prepare the 285-315Mhz, 580-610 Mhz and 685-715 Mhz transmitter and power amplifier inside.

Q: Could you compare the FPV1887 and the COFDM-912T for me?

A: FPV1887 receiver supports diversity RF tuner (2 antenna) input. FPV1887 transmitter supports 2M frequency bandwidth.
The bandwidth is adjusted to 2Mb, although the picture quality is not so good, but at least, the video signal is smooth. The penetration and diffraction capabilities of wireless signals are further improved. The COFDM-912T can only be adjusted to a minimum of 6MB, but when the signal is relatively poor, the picture will be stuck and frozen, and the video link will be interrupted.

The fpv1887 model might offer 2MHz, 4MHz, 6Mhz and 8MHz bandwidth options, which are adjustable. The 912T model doesn’t come with a 2M bandwidth.

Q: What distance can we cover using a land drone?

A: From drone transmitter in the ground receiver, 1 watt PA almost supports 10km, 2-watt power amplifier supports 30km and 3-watt power amplifier supports 50km. For land drone will be less range.

Q: If the transmitter antenna is 1 meter above the ground. Perhaps the directional antenna can be helpful on the receiver.

A: The transmission range also depended on whether there are obstacles between the transmitter and the receiver. Yagi directional antenna or flat panel directional antenna are recommended. Directional antenna has 12-14dbi, the omni antenna is only 6-7dbi. Please check our COFDM 2 watts Power amplifier transmitter are testing the NLOS.

 

Q: When using a drone on land. The design’s watertight, sealed construction is excellent. Can we use a cooler to cool things down?

A: Yes. The FPV transmitter is installed under the high-speed propellers spinning to cool. Please install it on a metal medium to allow it to dissipate heat with the help of metal.

Q: Does this model allow users to scramble video using its own code?

A: Yes, it supports AES 128-bit encryption and decryption. You can choose any password you like. The optional transmitter parameter configuration programming tool allows you to enter identical code into both the transmitter and receiver for communication. Otherwise, you won’t be able to lock onto the frequency and receive the video properly.

Q: About the amplifier’s power. Can we manage the output power to conserve battery life and control signal strength?

A: The configuration tool lets you adjust transmitted attenuation to control the power amplifier’s output. The Atten (Attenuation): 0dB≈ 3-watt PA; -2dB≈ 2-watt PA; -4dB≈ 1-watt PA (if you need to change the TX power to smaller than the default setting)

Q: The PA should have multiple power levels to conserve battery life. Adjust the transmit power based on the received signal strength.

A: It is no this function. Our model is based on one-way unidirectional transmission, and the transmitter cannot receive or sense the signal sensitivity of the receiving end to adjust its output power. Our two-way wireless video data transmission system has this function.

Q:May I use any controller on transmitter board to control or change TX PA level?

A: The attenuation value of the transmitter needs to be adjusted by the removable configuration board tool.If your company has software engineers, you can refer to the following technical documents to control the parameters of the transmitter board through the serial port.

How to configure the parameters of the FPV VTX module

So, it can be set manually in the config board only. In the UAV, the PA level may be controlled via the control channel. Cause, if the distance is not long, the TX PA level may be less to save the battery and save operator too.

Q:All parameters are adjustable via the UART channel. Also, the bandwidth.

A: Yes, clients need to be able to develop things themselves.We have this interface on the circuit board, but not on the shell.

Q: Can the VTX frequency be adjusted cover the entire band, from 70 MHz to 6 GHz?

A: The transmitter frequency supports from 150Mhz to 6Ghz. The receiver frequency supports from 170Mhz to 860Mhz. You need to add RF downconversion to the receiver.

Q: Does the PA also support frequencies from 150 MHz to 6000 MHz? I just need a new antenna, correct?

A: The default frequency is 595Mhz, then PA and transmitter antenna frequency range is 580~610Mhz. The frequency range is +/-15Mhz on the center working frequency.
If you need a different frequency, please tell us when you order, we will customize the power amplifier and transmitter for you. For example, if you want the working frequency at 300Mhz, then we do 285~315Mhz PA for you. Over 170-860Mhz, we also do for you. But the power amplifier output of 10 watts is only 5W, and its efficiency will be reduced.