FPV 175Mhz COFDM Digital VTX VRX wireless video transmitter and receiver

FPV 175Mhz COFDM Digital VTX VRX wireless video transmitter and receiver

特徵

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

Default VTX VRX Setting

重量和尺寸

可自訂選項

1. 頻率 & 帶寬

• 工作頻率: 例如, 1.2–1.3 GHz, 2.4 GHz, 5.8 GHz, or custom frequency bands

• 頻道頻寬: 例如, 2兆赫茲, 4兆赫茲, 6兆赫茲

2. 發射功率 & 範圍

• 輸出功率: 可調節的 (例如, 100 mW, 500 mW, 1 W, 10 W)

• 傳輸範圍: short-range (1–2 km) to long-range (50+ km)

• 電源電壓: 5–36 V DC or custom range

3. 影片 & 音訊介面

• 視訊輸入: HDMI, SDI, CVBS, or Ethernet/IP camera input

• 視訊輸出: HDMI, SDI, CVBS, or IP streaming (即時傳輸協定, UDP協定)

• Audio input/output: analog or digital audio support

4. 編碼 & 壓縮

• 視訊解析度支援: 480p, 720p, 1080p, 或更高

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

• 幀率: 25 fps, 30 fps, 60 fps, or custom

5. 調製 & 解調

• COFDM modulation parameters can be customized for robustness vs. 延遲

• Support for diversity reception with single or dual receiver setup

6. 控制 & Configuration

• Onboard buttons or remote control for video/audio switching

• Remote management via web GUI or serial commands

• 螢幕顯示 (螢幕顯示) overlay configuration

7. Physical Design

• Size and weight customization for drone payload requirements

• Connector types: SMA, MCX, N型, or custom

• Casing materials: 鋁, 塑膠, or custom colors

8. Special Features

• 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

常問問題

Q: For better video transmission, could you set the frequency to 170 MHz and increase the sensitivity?
一個: 是, 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.

Q: Can I directly connect my drone’s 4S battery to the video transmitter?
一個: 是, our COFDM wireless video transmitter can operate directly from a 4S battery. It supports voltages down to 11 V.

Q: How does a 4S battery voltage work?
一個: 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.

Q: 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?
一個: 是, you can reduce the transmit power by adjusting the transmitter parameters on the configuration board.

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

• 0 分貝 ≈ 3-watt PA (maximum power)

• –2 dB ≈ 2-watt PA

• –4 dB ≈ 1-watt PA

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

注意: 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.

Q: My ground station antenna is only 9 meters high. How can I maintain video signal from a UAV 30 km away without losing connection?
一個: Maintaining a stable video link at such a distance depends primarily on 視線 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, 塔, 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, 樹, or other obstructions between the UAV and the antenna.

提示: 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 公里範圍.

More

1. Core Technical Specifications

• 頻率範圍:

  • Operates within 170–860兆赫 預設, 和 175 兆赫 achievable via customized center frequency tuning (±15 MHz bandwidth around the target frequency) .

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

• 調製 & 協定:

  • COFDM (編碼正交頻分複用) for robust signal resilience in non-line-of-sight (NLOS) 環境.

  • 支援 AES-128 encryption for secure video transmission.

• 功率輸出:

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

  • 電源管理: Attenuation adjustments via config tools (例如, -4dB ≈ 1W).

• 延遲:

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

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

• Range Performance:

  • LOS (視線): 最多 50 千米 (3在賓州), 110 千米 (10在賓州).

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

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2. 自訂選項

• Frequency Tuning:

  • Specify center frequency (例如, 175 兆赫) during order. PA/antenna are then tailored to ±15 MHz around it.

• Bandwidth Flexibility:

  • 可調節的 2–8 MHz bandwidth (lower = better diffraction; higher = better image quality).

• Antenna & PA Matching:

  • Directional antennas (八木, 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. 相容性 & 介面

• Video Input/Output:

  • VTX Input: Analog CVBS (PAL/NTSC), HDMI, or SDI 威肯1726.

  • VRX Output: HDMI, CVBS.

• 數據 & 控制:

  • UART/Serial ports for parameter configuration (頻率, 加密).

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

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4. Real-World Deployment Notes

• 熱管理:

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

• 監理合規性:

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

• Range vs. 環境:

  • 城市非視距: ≤3 km | Suburban: 10–15 km | Maritime/Aerial LOS: 50–110 km.

• Receiver Diversity:

  • Dual-antenna VRX systems mitigate signal loss (例如, sensitivity: -100 分貝).