用於無線視頻數據鏈路發射機和接收機的 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.

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.

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

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.

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.

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 維肯1886