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?

A2: 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. https://i0.wp.com/ivcan.com/wp-content/uploads/2022/02/UI-Advance.webp

Q4: 7 tips you should know before you choose a wireless video transmitter and receiver with FHSS function.

A4: 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: Does your FPV VTX support the FHSS frequency automatic jumping function to avoid interference?

FPV VTX is a one-way transmission and cannot support the FHSS frequency automatic hopping function. FPV VTX is a one-way transmission, which can transmit the video from the aircraft to the ground receiver through the transmitter. FHSS function, when the user finds that the signal sensitivity is declining or encounters an obstacle, it will notify the transmitter and receiver to modify the frequency at the same time and find a frequency with the least interference for transmission. If only the receiver modifies the frequency without controlling the transmitter to modify the same frequency, the frequency of the transmitter and receiver will be inconsistent and the transmission will be interrupted. Because of the above requirement of notifying the transmitter to modify the frequency, the FHSS function needs to be based on a two-way transmission system. Or your FPV VTX can support modifying the frequency function through the serial port. When you need to modify the frequency, the operator sends a preset serial port command from the receiver to the serial port of the transmitter. After receiving this command notification, the transmitter automatically changes to the next frequency point. This is equivalent to your wireless transmission equipment, which has both a one-way video transmission function and a two-way data transmission function, which is equivalent to your current wireless control system. So whether it supports the serial port to modify the frequency of the transmitter depends on whether your current device supports it. Our models below support such functionality. Vcan1776 Vcan1886

FHSS 无线视频数据链路的跳频扩频

该型号专为具有双向无线数据链路的视频和数据无线传输而设计 代表 频率扩散频谱, 这是无线通信系统中使用的一种方法, 包含 无线视频数据发射器和接收器, 提高信号可靠性, 最小化干扰, 并提高安全性.

FHSS的工作原理

在FHSS系统中, 发射器和接收器 不断跳跃 在预定频率范围内的不同频率之间, 而不是保持一个频率. 这些啤酒花迅速发生，并在发射器和接收器之间同步, 确保两者在任何给定时间都处于相同的频率.

这是它的工作原理:

跳频: 该系统使用一系列频率, 和发射器以伪顺序迅速切换, 通常每秒数百或数千次.
同步: 发射器和接收器同步以同时在相同频率之间跳跃, 允许连续沟通而不会干扰.
跳图: 通常对频率啤酒花的模式进行预编程，并保存秘密或加密, 因此，即使有人试图拦截信号, 他们不会知道跳跃序列.

FHSS在无线视频数据系统中的好处

减少干扰: 通过经常更改频率, FHSS最大程度地减少了可能使用相同频带的其他设备的干扰风险, 提高信号的可靠性.
提高了安全性: 频率之间的快速切换使未经授权的用户很难拦截或堵塞通信, 增强安全性.
增强范围: 由于系统在频率之间不断跳跃, 持续干扰的可能性较小, 导致更好的沟通范围和稳定性.
在拥挤的RF环境中的稳健性: FHSS在许多无线流量或拥挤的无线电频率的环境中有效, 因为它避免停留在一个可能拥挤的频率上.
抵抗干扰: 如果以一个频率引入干扰信号, 该系统将迅速跳到另一个频率, 使干扰器很难破坏沟通.

FHSS vs. DSSS (直接序列扩散光谱)

该型号专为具有双向无线数据链路的视频和数据无线传输而设计 (频率扩散频谱) 不同频率之间的啤酒花, 减少干扰的机会并提供更好的安全性.
DSSS (直接序列扩散光谱) 将信号传播到宽频带中而无需跳跃, 在低层交流环境中提供更好的性能，但更容易受到窄带干扰.

无线视频发射器和接收器中的FHSS

在 无线视频数据系统, 如 FPV无人机 要么 实时广播系统, FHSS很有用，因为它:

通过避免其他无线设备的干扰来保持视频信号清晰.
允许连续, 在许多设备可能在相同频带上运行的环境中，高质量视频的稳定传输.
确保在嘈杂的RF环境中更好地性能 (像城市地区或拥挤的活动空间).

全面的, 该型号专为具有双向无线数据链路的视频和数据无线传输而设计 是无线视频系统中的宝贵技术, 提供更安全的, 可靠的, 以及用于高质量视频传输的干扰沟通.

FHSS如何在无人机无线视频发射器和接收器上工作?

FHSS是一种自动调频技术. 我们在无人机无线视频数据传输中广泛采用FHSS. 由于无人机的无线链路经常受到信号干扰.

在这个视频中, 该频点显示当前信号强度.

该 1365 我们看到的是我们无线传输设备当前的信号工作频点.

为什么这个频率会出现在这里?

因为右边有其他信号干扰. 它会自动运行.

如果信号再次受到干扰, 它又逃跑了, 选择干扰最小的频率.

这个过程是为了避免干扰. 我们也称其为FHSS功能.

Q1: 什么是FHSS跳频扩频?

A1: 跳频扩频 (该型号专为具有双向无线数据链路的视频和数据无线传输而设计) 是一种传输无线电信号的方法，涉及在各种频率之间快速改变载波频率.

FHSS 将同时在发射器和接收器上自动发生. FHSS用于远距离无线视频发射器和接收器防止窃听和干扰. 当当前工作频率被干扰或干扰时, 发射器和接收器断开连接并跳到下一个可用频率以重新连接.

Q2: 为什么需要FHSS功能?

A2:
1. 因为信号跳到不同的频段, FHSS信号具有很强的抗窄带干扰能力.

2. 如果跳频模式未知, 信号难以拦截.

3. 如果模式未知，干扰也很困难; 如果扩展序列未知, 信号只能被干扰一个跳频周期.

4. 相互干扰最小, FHSS 传输可以与许多类型的传统传输共享一个频段. FHSS 信号会干扰窄带通信，反之亦然.

Q3: 如何在您的无线视频数据发射器和接收器上设置 FHSS?

A3: 在网络管理器用户界面, 请选择提前页, 你可以看到上面的图片.
https://i0.wp.com/ivcan.com/wp-content/uploads/2022/02/UI-Advance.webp

Q4: 7 选择具有 FHSS 功能的无线视频发射器和接收器之前应了解的提示.

A4:
1. TX900B-2W 支持频率范围为1420~1530MHz, 并且有 110Mb 带宽可供使用.

2. 客户可设置工作带宽1.4M/3M/5M/10M/20MHz (然而, 1.4M/3MHz可能不适合视频传输). 那么TX900B-2W就可以工作在 FHSS模式 (跳频扩频) 系统会自动选择中心工作频率并可进行跳频 (1420~1530MHz之间) 在其工作期间.

3. 客户也可以规划使用1420~1530MHz全频段，也可以设置设备工作在固定频段.

4. TX900B-2W 支持最远距离22km.
除了支持的频率范围和最远距离, 外表, 接口, 用户界面, 手术, 等等, TX900B-2W 与现有的 TX900B-15km-2W 相同.

5. TX900B-2W 只支持频率范围为1420~1530MHz, 它不支持 800MHz 和 2.4GHz 频率范围.

6. 有两个版本, TX900B-2W-15km, 和TX900B-2W-22km.

7. 作为 TX900B-2W 频率范围为110Mb, 所以如果你将工作带宽配置为 10Mb, 那么你会得到 11 指向跳跃.

Q5: 你们的FHSS的工作原理是什么?

我们的无线视频收发器采用智能选频-干扰规避.

智能选频 (干扰避免) 技术是一种新型的抗干扰技术, 可以有效避免干扰，最大限度提高无线传输的可靠性和稳定性.

我们独特的智能频率选择的关键 (干扰避免) 技术在于干扰检测三大流程, 决策, 和切换执行. 干扰检测是指在正常通信过程中实时检测各频点的干扰和背景噪声, 为决策提供基础支撑. 决策由各节点独立完成, 以优化自身接收性能为准则选择最佳频率. 该点作为接收频点; 决策选择新的最佳频点后切换执行, 并且切换过程不会造成数据丢失, 确保数据传输稳定、持续.

我们独特的智能选频 (避免干扰) 技术使每个节点能够独立、动态地选择不同的最佳频点进行不同频率组网, 从而优化网络整体性能，有效避免干扰.

请检查下面的图片, 蓝色区域为有效信号, 和红线为干扰线.
FHSS

Q6: 您的FPV VTX是否支持FHSS频率自动跳频功能以避免干扰?

FPV VTX是单向传输，不支持FHSS自动跳频功能.

FPV VTX 是一种单向传输, 可将飞行器的视频通过发射器传输至地面接收器.

跳频功能, 当用户发现信号灵敏度下降或遇到障碍物时, 通知发射机和接收机同时修改频率，寻找干扰最小的频率进行传输. 如果仅接收机修改频率而不控制发射机修改相同频率, 发射器和接收器的频率不一致，传输会中断.

由于上述通知发射机修改频率的要求, FHSS功能需要基于双向传输系统.

或者您的FPV VTX可以支持通过串口修改频率功能. 当需要修改频率时, 操作员将预设的串口命令从接收器发送到发射器的串口. 收到此命令通知后, 发射机自动切换到下一个频点.

这相当于你的无线传输设备, 既具有单向视频传输功能，又具有双向数据传输功能, 相当于你现在的无线控制系统. 所以是否支持串口修改发射机频率要看你当前的设备是否支持.

我们的以下型号支持此类功能.
Vcan1776 维肯1886

FHSS Frequency-hopping spread spectrum — FHSS 跳频扩频

Q: 您是否有符合以下要求的视频数据链接?

所需距离为 50 公里, 该型号专为具有双向无线数据链路的视频和数据无线传输而设计 (跳过 1,000 一秒钟内的次数), 理想情况下高于 6Ghz (其他可以考虑, 最重要的是跳频技术), 并且还需要传输数据, 视频, 并保护遥控通道, 最好是一组数据链接 (发射机 + 接收器 + 天线) 采用跳频技术 (该型号专为具有双向无线数据链路的视频和数据无线传输而设计)

iVcan 回复: 没有, 频率只有1.4G, 6Ghz工作频率需要定制开发.

Q: 有支持FHSS跳频扩频的可选型号吗?

在下图中, 你可以看到有 12 准备好 FHSS 的点频率.

FHSS Frequency-hopping spread spectrum for wireless video data link transmitter and receiver 1

实时干扰检测功能

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FPV TX RX模块板

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