FHSS Frequency-hopping spread spectrum para sa wireless video data link transmitter at 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, at mayroong 110Mb bandwidth na gagamitin.

2. Maaaring itakda ng customer ang gumaganang bandwidth bilang 1.4M/3M/5M/10M/20MHz (gayunman, 1.4M/3MHz may not be suited for video transmitting). Pagkatapos ay maaaring gumana ang TX900B-2W FHSS mode (Frequency-hopping spread spectrum) and the system will automatically select the central working frequency and may do frequency hopping (sa pagitan ng 1420~1530MHz) sa panahon ng pagtatrabaho nito.

3. Maaari ding planuhin ng mga customer na gamitin ang mga frequency channel sa buong 1420~1530MHz at itakda ang device na gumana din sa mga fixed frequency channel..

4. TX900B-2W supports the longest distance at 22km.
Maliban sa frequency range na sinusuportahan at ang pinakamahabang distansya, ang pisikal na anyo, interface, UI, operasyon, at iba pa, ang TX900B-2W ay kapareho ng umiiral na TX900B-15km-2W.

5. TX900B-2W only support a frequency range is 1420~1530MHz, hindi nito sinusuportahan ang 800MHz at 2.4GHz frequency range.

6. Mayroong dalawang bersyon, TX900B-2W-15km, at TX900B-2W-22km.

7. As the TX900B-2W frequency range is 110Mb, kaya kung i-configure mo ang gumaganang bandwidth bilang 10Mb, pagkatapos ay makakakuha ka 11 tumuturo sa paglukso.

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.

Mangyaring suriin ang larawan sa ibaba, the blue area is the effective signal, at 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 Vcan1886