How does FHSS work on the drone wireless video transmitter and receiver?
FHSS is an automatic frequency modulation technology. We widely used FHSS in wireless video data transmission of drones. Because the drone’s wireless link is often subject to signal interference.
In this video, this frequency point shows the current signal strength.
The 1365 we see is the current signal working frequency point of our wireless transmission equipment.
Why does this frequency go here?
Because there are other signals on the right that are interfering. It will run automatically.
If the signal receives interference again, it runs away again, choosing the frequency with the least interference.
This process is meant to avoid interference. We also call it the FHSS function.
Q1: What is the FHSS Frequency-hopping spread spectrum?
A1: Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals that involves rapidly changing the carrier frequency among a wide range of frequencies.
FHSS will occur automatically on both the transmitter and receiver at the same time. FHSS is used to prevent eavesdropping and interference on the long-range wireless video transmitter and receiver. When the current working frequency is jammed or interfered with, the transmitter and receiver disconnect and hop to the next available frequency to reconnect.
Q2: Why do you need the FHSS function?
1. Because the signal hops to a different frequency band, FHSS signals are highly resistant to narrow-band interference.
2. If the frequency-hopping pattern is unknown, signals are difficult to intercept.
3. Jamming is also difficult if the pattern is unknown; if the spreading sequence is unknown, the signal can only be jammed for a single hopping period.
4. With minimal mutual interference, FHSS transmissions can share a frequency band with many types of conventional transmissions. FHSS signals interfere in narrow-band communications and vice versa.
Q3: How to set the FHSS at your wireless video data transmitter and receiver?
A3: At the web manager UI, please choose the advance page, you can see the above picture.
Q4: 7 tips you should know before you choose a wireless video transmitter and receiver with FHSS function.
1. TX900B-2W supports the frequency range is 1420~1530MHz, and there is 110Mb bandwidth to use.
2. The customer can set the working bandwidth as 1.4M/3M/5M/10M/20MHz (However, 1.4M/3MHz may not be suited for video transmitting). Then TX900B-2W can work in FHSS mode (Frequency-hopping spread spectrum) and the system will automatically select the central working frequency and may do frequency hopping (between 1420~1530MHz) during its working.
3. Customers can also plan to use the frequency channels in the whole 1420~1530MHz and set the device to work in the fixed frequency channels too.
4. TX900B-2W supports the longest distance at 22km.
Except for the frequency range supported and the longest distance, the physical appearance, interface, UI, operation, and so on, the TX900B-2W is the same as the existing TX900B-15km-2W.
5. TX900B-2W only support a frequency range is 1420~1530MHz, it does not support 800MHz and 2.4GHz frequency range.
6. There are two versions, TX900B-2W-15km, and TX900B-2W-22km.
7. As the TX900B-2W frequency range is 110Mb, so if you config the working bandwidth as 10Mb, then you will get 11 points to hopping.
Q5: What is the working principle of your FHSS?
Our wireless video transceiver adopts intelligent frequency selection-interference avoidance.
Intelligent frequency selection (interference avoidance) technology is a new anti-interference technology, which can effectively avoid interference and maximize the reliability and stability of wireless transmission.
The key to our unique intelligent frequency selection (interference avoidance) technology lies in the three major processes of interference detection, decision-making, and switching execution. Interference detection refers to real-time detection of interference and background noise at each frequency point during normal communication, so as to provide basic support for decision-making. The decision-making is completed independently by each node, and the optimal frequency is selected based on the criterion of optimizing its own receiving performance. The point is used as the receiving frequency point; the switching execution occurs after the decision selects a new optimal frequency point, and the switching process will not cause data loss, ensuring stable and continuous data transmission.
Our unique intelligent frequency selection (disturbance avoidance) technology enables each node to independently and dynamically select different optimal frequency points for different frequency networking, so as to optimize the overall network performance and effectively avoid interference.
Please check the below picture, the blue area is the effective signal, and the red line is interference.
Q6: Do you have a video data link as per the below requirement?
The required distance is 50 kilometers, with frequency hopping technology (jumping over 1,000 times in one second), ideally above 6Ghz (others can be considered, the most important thing is frequency hopping technology), and it is also necessary to transmit data, video, and protect the remote control channel, preferably A set of data links (transmitter + receiver + antenna) using frequency hopping technology (FHSS)
iVcan Reply: No, The frequency is only 1.4G, the working frequency for 6Ghz needs custom development.
Q7: Do you have any optional model to support the FHSS Frequency-hopping spread spectrum?
In the below picture, you can see that there are 12 points frequency ready for FHSS.
Real-time interference detection function
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FAQs about Wireless Video Transmitter and Receiver
Our wireless video transmitters have these types of video input interfaces: HDMI 1080P and 4K HDMI, CVBS composite, SDI, AHD, IP Ethernet, BNC, or tell us what type do you need, our engineer will modify to meet your demand.
Our transmission distance can be adjusted by adding power amplifiers. At present, the main ones are 15km, 30km, 50km, 80km, 100km , and 150km, which depend on the needs of customers.
Of course, the transmission distances listed above are all within LOS the line-of-sight range. If there are obstacles between the transmitter and the receiver, NLOS (the non-line-of-sight), the transmission distance is greatly reduced, only 1km or 2km, depending on the number of intermediate obstacles and the local wireless environment.
One-way means, We can only transmit and download video or data from the wireless video transmitter to the receiver in one direction, and we cannot upload video or data from the receiver to the transmitter. This type is also called simplex.
Two-way means that, not only we can download video or data from our wireless transmitter to the receiver, but also we can upload the video or data from the receiver to the transmitter. This is very suitable for operating drones. You can not only see the real-time video transmitted from the drone, but also upload the command to control the drone or the command to control the PTZ camera to adjust the angle to the transmitter. This can operate simultaneously. This type also named half-dulpex or full-duplex.
Please check the details at the below link. https://ivcan.com/request-a-quote-of-wireless-video-transmission/#simplex
Most Wireless video transmitters now support AES128 or AES256 bit encryption and decryption, depending on which model you choose. Please contact us to verify.
The frequencies of both the wireless video transmitter and the wireless video receiver can be modified. Users need to purchase additional parameter configuration boards.
However, considering that the corresponding power amplifier and antenna are already fixed within a certain range when the goods are sent out. If the user adjusts the frequency of the transmitter, the corresponding power amplifier, transmitter antenna and receiver antenna should also be modified to the same frequency, and these users need to be prepared. If not, it will cause the frequency of the wireless video transmitter to be different from the frequency of the antenna, making reception difficult. So please be sure to inform the correct frequency you need before placing an order.
If it is for security or confidentiality, you can use the encryption and decryption functions of the transmitter and receiver, which can ensure that your video transmission is private. .
Yes, all our product parameters can be customized according to customer's needs. If you have a special request, please let us know via the link below.
- Change the place of the receiver to avoid potential local interference from strong magnetic environments.
- Ensure that the antennas on both the transmitter and receiver are vertical.
- Please raise the antennas of the transmitter and receiver to maintain a certain height difference.
- Please look around to ensure that there are no obstacles between the transmitter and receiver.
- Change the orientation of the receiver antenna.
- If it doesn't work, try moving the receiver to be near the transmitter's position to see if it exceeds the effective wireless transmission distance.
- Or consider adding a relay of the transmitting between the transmitter and receiver.
- The antenna should be as high off the ground as possible, as the ground will absorb the transmitted signal.
Of course, we also understand that wireless video transmission transmitters and receivers are very expensive. You are far away from the China factory. and hope that the goods you receive are fit for the best performance.
If you pay special attention to a specific parameter or function, we can take some test videos based on the features you want to see, please feel free to contact us. It won't be shipped to you directly without your approval.
To test the delay of the wireless video transmitter and receiver, we need to do two tests.
The first is to test the delay from the camera to the display.
The second is the camera, plus the display plus the wireless image transmission transmitter and the delay of the receiver.
Subtracting the two test results is the real delay of the wireless video transmitter and receiver.
As a professional long-range HDMI wireless video transmitter and receiver supplier and manufacturer in China Shenzhen, we produce the best wireless video transmitter and receiver for many years, and we got a good reputation and best reviews.
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The wireless video transmitter sender TX RX frequency has 170-806Mhz, 1.2ghz, 2.4G, 5.8G, lowest but not zero latency. In order to support longer distances, the power amplifier has 10w, 20watts, and even 30W.
What is a best buy FHD wireless video transmitter at a cheap price? It should consider your details requirement, choose suitably, not expensive, if you have any doubt, please fulfil the request a quote form, our engineer will offer you a solution.