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

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.

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.

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

A4:
1. TX900B-2W supports the frequency range is 1420~1530MHz, mme ho na le bandwidth ea 110Mb eo u ka e sebelisang.

2. Moreki a ka beha bandwidth ea ho sebetsa joalo ka 1.4M/3M/5M/10M/20MHz (Leha ho le joalo, 1.4M/3MHz may not be suited for video transmitting). Ebe TX900B-2W e ka sebetsa ho Mokhoa oa FHSS (Frequency-hopping spread spectrum) and the system will automatically select the central working frequency and may do frequency hopping (pakeng tsa 1420 ~ 1530MHz) nakong ea ts'ebetso ea eona.

3. Bareki le bona ba ka rera ho sebelisa liteishene tsa frequency ho 1420 ~ 1530MHz kaofela mme ba seta sesebelisoa hore se sebetse liteisheneng tse tsitsitseng tsa frequency..

4. TX900B-2W supports the longest distance at 22km.
Ntle le sebaka sa maqhubu a tšehetsoeng le sebaka se selelele ka ho fetisisa, ponahalo ya mmele, segokanyimmediamentsi sa sebolokigolo, UI, opereishene, joalo joalo, TX900B-2W e tšoana le TX900B-15km-2W e teng..

5. TX900B-2W only support a frequency range is 1420~1530MHz, ha e tšehetse 800MHz le 2.4GHz frequency range.

6. Ho na le liphetolelo tse peli, TX900B-2W-15km, le TX900B-2W-22km.

7. As the TX900B-2W frequency range is 110Mb, kahoo haeba u lokisa bandwidth e sebetsang e le 10Mb, joale u tla fumana 11 lintlha tsa ho tlola.

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.

Ka kopo, sheba setshwantsho tlase, the blue area is the effective signal, le the red line is 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 Setšoantšo sa 1886