FPV 175Mhz COFDM 디지털 VTX VRX 무선 비디오 송신기 및 수신기

FPV 175Mhz COFDM 디지털 VTX VRX 무선 비디오 송신기 및 수신기

특색

• The operating frequency can be customized.
• 주파수가 낮을수록, the lower the probability of interference.
• The bandwidth can be set to 2Mb.
• Stronger diffraction transmission capability.

Default VTX VRX Setting

무게와 크기

사용자 정의 가능한 옵션

1. 회수 & 대역폭

• 작동 주파수: 예를 들어, 1.2–1.3 GHz, 2.4 GHz, 5.8 GHz, or custom frequency bands

• 채널 대역폭: 예를 들어, 2 MHz, 4 MHz, 6 MHz

2. 전송 전력 & 범위

• 출력 전력: 조절할 수 있는 (예를 들어, 100 mW, 500 mW, 1 W, 10 W)

• 전송 범위: short-range (1–2 km) to long-range (50+ km)

• 전원 전압: 5–36 V DC or custom range

3. 동영상 & Audio Interfaces

• 비디오 입력: HDMI, SDI, CVBS, or Ethernet/IP camera input

• 비디오 출력: HDMI, SDI, CVBS, or IP streaming (RTSP, UDP)

• Audio input/output: analog or digital audio support

4. 부호화 & 압축

• Video resolution support: 480p, 720p, 1080p, 이상

• Compression options: H.264, H.265, or uncompressed for low-latency

• 프레임 속도: 25 fps, 30 fps, 60 fps, or custom

5. 조정 & 복조

• COFDM modulation parameters can be customized for robustness vs. 숨어 있음

• Support for diversity reception with single or dual receiver setup

6. 제어 & 구성

• Onboard buttons or remote control for video/audio switching

• Remote management via web GUI or serial commands

• OSD (온스크린 디스플레이) overlay configuration

7. Physical Design

• Size and weight customization for drone payload requirements

• Connector types: 고등학교, MCX, N형, or custom

• Casing materials: aluminum, plastic, or custom colors

8. 특별한 기능

• Anti-interference or frequency hopping features

• Low-latency mode for FPV racing

• Recording function or onboard storage option

• Support for mesh networking or multi-transmitter scenarios

자주하는 질문

큐: For better video transmission, could you set the frequency to 170 MHz and increase the sensitivity?
에이: 예, we can customize it at 170Mhz, but 175Mhz is much better at sensitivity. 170Mhz is the lowest frequency range that the receiver can allow, and it would be better to set the center frequency at 175Mhz.

큐: Can I directly connect my drone’s 4S battery to the video transmitter?
에이: 예, our COFDM wireless video transmitter can operate directly from a 4S battery. It supports voltages down to 11 V.

큐: How does a 4S battery voltage work?
에이: Nominal voltage: 4 × 3.7 V = 14.8 V; Fully charged voltage: 4 × 4.2 V = 16.8 V; Safe discharge lower limit: 4 × 3.0 V = 12.0 V. Even when your battery voltage drops near 11 V, the transmitter will continue to operate safely.

큐: I purchased the 3W PA version. If I don’t need long-distance transmission, can I reduce the output power to 1W to save battery?
에이: 예, you can reduce the transmit power by adjusting the transmitter parameters on the configuration board.

큐: How do I adjust the transmit power via the transmitter parameter configuration board?
Please modify the ATTEN (감쇠) parameter in the transmitter settings. (see above picture). Power levels correspond to the following attenuation values:

• 0 데시벨 ≈ 3-watt PA (최대 전력)

• -2dB ≈ 2-watt PA

• –4 dB ≈ 1-watt PA

By increasing the attenuation value (more negative dB), the output power will be reduced accordingly.

메모: After adjusting the parameter, please save the settings and reboot the transmitter to ensure the new power level takes effect.

If you need assistance accessing the configuration interface, please contact our support team.

큐: My ground station antenna is only 9 미터 높이. How can I maintain video signal from a UAV 30 km away without losing connection?
에이: Maintaining a stable video link at such a distance depends primarily on 시선 between the UAV and the ground station. To optimize reception:

1. Do not extend the antenna feed line.
   • Longer cables introduce signal loss and reduce antenna sensitivity, which can worsen reception.
2. Elevate the receiver antenna as high as possible.
   • Place the antenna on a mast, tower, or any elevated structure to improve line-of-sight.
3. Use high-gain antennas if allowed.
   • Directional antennas such as Yagi or parabolic can help focus signal reception over long distances.
4. Minimize obstacles and interference.
   • Ensure there are no buildings, 나무, or other obstructions between the UAV and the antenna.

팁: The higher the antenna, the farther the radio horizon extends, greatly improving long-distance signal reliability. Even a modest increase from 9 m to 15–20 m can make a significant difference for a 30 km 범위.

더

1. Core Technical Specifications

• 주파수 범위:

  • Operates within 170–860MHz 기본, ~와 함께 175 메가 헤르츠 achievable via customized center frequency tuning (±15 MHz bandwidth around the target frequency) .

  • 예: Ordering a 175 MHz system configures the power amplifier (아빠) and antenna for 160–190 MHz, at 175Mhz frequency performance is best.

• 조정 & 프로토콜:

  • COFDM (코딩된 직교 주파수 분할 다중화) for robust signal resilience in non-line-of-sight (NLOS) 환경.

  • 지원 AES-128 암호화 for secure video transmission.

• 전력 출력:

  • Configurable from 1W ~ 50W (default 3W). Higher power extends range but increases heat/power consumption.

  • Power Management: Attenuation adjustments via config tools (예를 들어, -4dB ≈ 1W).

• 지연 시간:

  • <150 MS for analog CVBS inputs (suitable for FPV drones).

  • 500–600 ms for HDMI/SDI inputs (common in broadcast systems).

• Range Performance:

  • 로스 (가시선): 최대 50 km (3PA에서는), 110 km (10PA에서는).

  • NLOS (Non-LOS): 1–3 km in urban areas.

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2. Customization Options

• Frequency Tuning:

  • Specify center frequency (예를 들어, 175 메가 헤르츠) during order. PA/antenna are then tailored to ±15 MHz around it.

• Bandwidth Flexibility:

  • 조절할 수 있는 2–8 MHz bandwidth (lower = better diffraction; higher = better image quality).

• 안테나 & PA Matching:

  • Directional antennas (야기, Helical) are required for long-range. Omnidirectional antennas reduce the range by 50%.

• Power Scaling:

  • PA output is customizable from 1W to 50W.

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3. 호환성 & 인터페이스

• Video Input/Output:

  • VTX Input: Analog CVBS (PAL/NTSC), HDMI, 또는 SDI Vcan1726.

  • VRX Output: HDMI, CVBS.

• 데이터 & 제어:

  • UART/Serial ports for parameter configuration (빈도, 암호화).

  • Limitation: No automatic power adjustment based on signal strength.

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4. Real-World Deployment Notes

• 열 관리:

  • 3W+ PA requires heatsinks + active cooling (팬). Overheating triggers auto-shutdown.

• 규제 준수:

  • >1W transmission mandates HAM licensing in most countries.

• Range vs. 환경:

  • 도시 NLOS: ≤3 km | Suburban: 10–15 km | Maritime/Aerial LOS: 50–110 km.

• Receiver Diversity:

  • Dual-antenna VRX systems mitigate signal loss (예를 들어, 감광도: -100 dBm).