FPV 175MHz COFDM DIGITAL VTX VRX VIDEO VIDEO VIDEO و گیرنده بی سیم

FPV 175MHz COFDM DIGITAL VTX VRX VIDEO VIDEO VIDEO و گیرنده بی سیم

ویژگی

• فرکانس عملیاتی را می توان سفارشی کرد.
• هر چه فرکانس کمتر باشد, the lower the probability of interference.
• The bandwidth can be set to 2Mb.
• Stronger diffraction transmission capability.

Default VTX VRX Setting

Weight and Size

گزینه های قابل تنظیم

1. فرکانس & Bandwidth

• فرکانس کاری: به عنوان مثال, 1.2–1.3 GHz, 2.4 GHz, 5.8 GHz, or custom frequency bands

• پهنای باند کانال: به عنوان مثال, 2 مگاهرتز, 4 مگاهرتز, 6 مگاهرتز

2. قدرت انتقال & محدوده

• توان خروجی: قابل تنظیم (به عنوان مثال, 100 mW, 500 mW, 1 دبلیو, 10 دبلیو)

• محدوده انتقال: short-range (1–2 km) to long-range (50+ km)

• ولتاژ منبع تغذیه: 5–36 V DC or custom range

3. ویدئو & Audio Interfaces

• ورودی ویدیو: HDMI, SDI, CVBS, or Ethernet/IP camera input

• Video output: HDMI, SDI, CVBS, or IP streaming (RTSP, UDP)

• Audio input/output: analog or digital audio support

4. رمزگذاری & فشرده سازی

• پشتیبانی از وضوح تصویر: 480ص, 720ص, 1080ص, یا بالاتر

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

• نرخ فریم: 25 fps, 30 fps, 60 fps, or custom

5. تلفیق & دمدولاسیون

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

• Support for diversity reception with single or dual receiver setup

6. کنترل کنید & پیکربندی

• Onboard buttons or remote control for video/audio switching

• Remote management via web GUI or serial commands

• OSD (نمایش روی صفحه) overlay configuration

7. Physical Design

• Size and weight customization for drone payload requirements

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

• Casing materials: آلومینیوم, plastic, or custom colors

8. ویژگی های خاص

• 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

پرسش و پاسخ

س: For better video transmission, could you set the frequency to 170 MHz and increase the sensitivity?
آ: بله, 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.

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

س: How does a 4S battery voltage work?
آ: 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.

س: 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?
آ: بله, you can reduce the transmit power by adjusting the transmitter parameters on the configuration board.

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

• 0 دسی بل ≈ 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.

Note: 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.

س: My ground station antenna is only 9 متر ارتفاع. How can I maintain video signal from a UAV 30 km away without losing connection?
آ: Maintaining a stable video link at such a distance depends primarily on خط دید 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, درختان, or other obstructions between the UAV and the antenna.

نکته: 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 برد کیلومتر.

More

1. Core Technical Specifications

• Frequency Range:

  • Operates within 170-860 مگاهرتز پیش فرض, با 175 مگاهرتز achievable via customized center frequency tuning (±15 MHz bandwidth around the target frequency) .

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

• تلفیق & پروتکل ها:

  • COFDM (مولتی پلکسینگ تقسیم فرکانس متعامد کد شده) for robust signal resilience in non-line-of-sight (NLOS) محیط ها.

  • Supports AES-128 encryption for secure video transmission.

• توان خروجی:

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

  • مدیریت نیرو: Attenuation adjustments via config tools (به عنوان مثال, -4dB ≈ 1W).

• تأخیر:

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

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

• Range Performance:

  • LOS (خط دید): تا 50 کیلومتر (3در PA), 110 کیلومتر (10در PA).

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

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2. گزینه های سفارشی سازی

• تنظیم فرکانس:

  • Specify center frequency (به عنوان مثال, 175 مگاهرتز) during order. PA/antenna are then tailored to ±15 MHz around it.

• Bandwidth Flexibility:

  • قابل تنظیم 2–8 MHz bandwidth (lower = better diffraction; higher = better image quality).

• Antenna & PA Matching:

  • Directional antennas (یاگی, 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. سازگاری & رابط ها

• ورودی/خروجی ویدئو:

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

  • VRX Output: HDMI, CVBS.

• داده ها & کنترل کنید:

  • UART/Serial ports for parameter configuration (فرکانس, رمزگذاری).

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

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4. Real-World Deployment Notes

• مدیریت حرارتی:

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

• رعایت مقررات:

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

• Range vs. محیط زیست:

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

• Receiver Diversity:

  • Dual-antenna VRX systems mitigate signal loss (به عنوان مثال, sensitivity: -100 DBM به).