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

用於無線視訊資料鏈路的 FHSS 跳頻擴頻

FHSS 代表 頻率擴散頻譜, 這是無線通信系統中使用的一種方法, 包含 無線視頻數據發射器和接收器, 提高信號可靠性, 最小化干擾, 並提高安全性.

FHSS的工作原理

在FHSS系統中, 發射器和接收器 不斷跳躍 在預定頻率範圍內的不同頻率之間, 而不是保持一個頻率. 這些啤酒花迅速發生，並在發射器和接收器之間同步, 確保兩者在任何給定時間都處於相同的頻率.

這是它的工作方式:

跳頻: 該系統使用一系列頻率, 和發射器以偽順序迅速切換, 通常每秒數百或數千次.
同步: 發射器和接收器同步以同時在相同頻率之間跳躍, 允許連續溝通而不會干擾.
跳圖: 通常對頻率啤酒花的模式進行預編程，並保存秘密或加密, 因此，即使有人試圖攔截信號, 他們不會知道跳躍序列.

FHSS在無線視頻數據系統中的好處

減少干擾: 通過經常更改頻率, FHSS最大程度地減少了可能使用相同頻帶的其他設備的干擾風險, 提高信號的可靠性.
提高了安全性: 頻率之間的快速切換使未經授權的用戶很難攔截或堵塞通信, 增強安全性.
增強範圍: 由於系統在頻率之間不斷跳躍, 持續干擾的可能性較小, 導致更好的溝通範圍和穩定性.
在擁擠的RF環境中的穩健性: FHSS在許多無線流量或擁擠的無線電頻率的環境中有效, 因為它避免停留在一個可能擁擠的頻率上.
抵抗干擾: 如果以一個頻率引入乾擾信號, 該系統將迅速跳到另一個頻率, 使乾擾器很難破壞溝通.

FHSS vs. DSSS (直接序列擴散光譜)

FHSS (頻率擴散頻譜) 不同頻率之間的啤酒花, 減少干擾的機會並提供更好的安全性.
DSSS (直接序列擴散光譜) 將信號傳播到寬頻帶中而無需跳躍, 在低層交流環境中提供更好的性能，但更容易受到窄帶乾擾.

無線視頻發射器和接收器中的FHSS

在 無線視頻數據系統, 如 FPV無人機 要么 實時廣播系統, FHSS很有用，因為它:

通過避免其他無線設備的干擾來保持視頻信號清晰.
允許連續, 在許多設備可能在相同頻帶上運行的環境中，高質量視頻的穩定傳輸.
確保在嘈雜的RF環境中更好地性能 (像城市地區或擁擠的活動空間).

全面的, FHSS 是無線視頻系統中的寶貴技術, 提供更安全的, 可靠的, 以及用於高質量視頻傳輸的干擾溝通.

FHSS如何在無人機無線視訊發射器和接收器上運作?

FHSS是一種自動調頻技術. 我們在無人機無線視訊資料傳輸中廣泛採用FHSS. 由於無人機的無線鏈路經常受到訊號幹擾.

在這個視頻中, 此頻點顯示當前訊號強度.

該 1365 我們看到的是我們無線傳輸設備目前的訊號工作頻點.

為什麼這個頻率會出現在這裡?

因為右邊有其他訊號幹擾. 它會自動運行.

如果訊號再次受到干擾, 它又逃跑了, 選擇幹擾最小的頻率.

這個過程是為了避免干擾. 我們也稱為FHSS功能.

Q1: 什麼是FHSS跳頻擴頻?

A1: 跳頻擴頻 (FHSS) 是一種傳輸無線電訊號的方法，涉及在各種頻率之間快速改變載波頻率.

FHSS 將在發射器和接收器上同時自動發生. FHSS用於防止遠距離無線視訊發射器和接收器的竊聽和乾擾. 噹噹前工作頻率受到干擾或乾擾時, 發射器和接收器斷開連接並跳至下一個可用頻率以重新連接.

Q2: 為什麼需要FHSS功能?

A2:
1. 因為訊號跳到不同的頻段, FHSS訊號具有很強的抗窄帶幹擾能力.

2. 如果跳頻模式未知, 信號難以攔截.

3. 如果模式未知，幹擾也很困難; 如果擴展序列未知, 訊號只能被幹擾一個跳頻週期.

4. 互相干擾最小, FHSS 傳輸可與多種類型的傳統傳輸共享頻帶. FHSS 訊號會幹擾窄頻通信，反之亦然.

Q3: 如何在無線視訊資料傳送器和接收器上設定 FHSS?

A3: 在網路管理器使用者介面, 請選擇進階頁面, 你可以看到上面的圖片.
https://i0.wp.com/ivcan.com/wp-content/uploads/2022/02/UI-Advance.webp

Q4: 7 在選擇具有FHSS功能的無線視訊發射器和接收器之前您應該了解的提示.

A4:
1. TX900B-2W 支援頻率範圍1420~1530MHz, 並且有 110Mb 帶寬可供使用.

2. 客戶可設置工作帶寬為1.4M/3M/5M/10M/20MHz (然而, 1.4M/3MHz可能不適合視訊傳輸). 那麼TX900B-2W就可以工作在 跳頻模式 (跳頻擴頻) 系統會自動選擇中心工作頻率，並可進行跳頻 (1420~1530MHz之間) 在其工作期間.

3. 客戶也可以規劃使用1420~1530MHz全頻段，也可以設置設備工作在固定頻段.

4. TX900B-2W 支援最遠距離22km.
除了支持的頻率範圍和最遠距離, 外表, 接口, 用戶界面, 手術, 等等, TX900B-2W 與現有的 TX900B-15km-2W 相同.

5. TX900B-2W 僅支援頻率範圍為1420~1530MHz, 它不支持 800MHz 和 2.4GHz 頻率範圍.

6. 有兩個版本, TX900B-2W-15km, 和TX900B-2W-22km.

7. 作為 TX900B-2W 頻率範圍為110Mb, 所以如果你將工作帶寬配置為 10Mb, 那麼你會得到 11 指向跳躍.

Q5: 你們的FHSS的工作原理是什麼?

我們的無線視訊收發器採用智慧選頻-幹擾規避.

智慧選頻 (幹擾避免) 技術是一種新型的抗干擾技術, 可有效避免干擾，最大限度地提高無線傳輸的可靠性和穩定性.

我們獨特的智慧頻率選擇的關鍵 (幹擾避免) 技術在於幹擾檢測三大流程, 決策, 和切換執行. 幹擾檢測是指在正常通訊過程中即時偵測各頻點的干擾和背景噪音, 為決策提供基礎支撐. 決策由各節點獨立完成, 以最佳化自身接收效能為準則選擇最佳頻率. 該點作為接收頻點; 決策選擇新的最佳頻點後切換執行, 並且切換過程不會造成資料遺失, 確保資料傳輸穩定、持續.

我們獨特的智慧選頻 (避免干擾) 技術使每個節點能夠獨立、動態地選擇不同的最佳頻點進行不同頻率組網, 從而優化網路整體效能，有效避免干擾.

請檢查下圖, 藍色區域為有效訊號, 和紅線為幹擾線.
FHSS

Q6: 您的FPV VTX是否支援FHSS頻率自動跳頻功能以避免干擾?

FPV VTX是單向傳輸，不支援FHSS自動跳頻功能.

FPV VTX 是一種單向傳輸, 可將飛行器的視訊透過發射器傳送至地面接收器.

跳頻功能, 當使用者發現訊號靈敏度下降或遇到障礙物時, 通知發射機和接收機同時修改頻率，尋找幹擾最小的頻率進行傳輸. 如果僅接收機修改頻率而不控制發射機修改相同頻率, 發射器和接收器的頻率不一致，傳輸會中斷.

由於上述通知發射機修改頻率的要求, FHSS功能需要基於雙向傳輸系統.

或者您的FPV VTX可以支援透過串列埠修改頻率功能. 當需要修改頻率時, 操作員將預設的串列命令從接收器發送到發射器的串列埠. 收到此命令通知後, 發射機自動切換到下一個頻點.

這相當於你的無線傳輸設備, 既有單向視訊傳輸功能，又具有雙向資料傳輸功能, 相當於你現在的無線控制系統. 所以是否支援串口修改發射機頻率要看你目前的設備是否支持.

我們的以下型號支援此類功能.
Vcan1776 維肯1886

FHSS Frequency-hopping spread spectrum — FHSS 跳頻擴頻

Q: 您是否有符合以下要求的視頻數據鏈接?

所需距離為 50 公里, 採用跳頻技術 (跳過 1,000 一秒鐘內的次數), 理想情況下高於 6Ghz (其他可以考慮, 最重要的是跳頻技術), 並且還需要傳輸數據, 視頻, 並保護遙控通道, 最好是一組數據鏈接 (發射機 + 接收器 + 天線) 採用跳頻技術 (FHSS)

iVcan 回复: 沒有, 頻率只有1.4G, 工作頻率6Ghz需要客製化開發.

Q: 有支援FHSS跳頻擴頻的選配型號嗎?

在下圖中, 你可以看到有 12 準備好 FHSS 的點頻率.

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

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