UHF 視訊發射器接收器對 – P2MP 常見問題指南

COFDM 解決方案 507.25 兆赫 (頻道 20) 應用

Many customers are looking for a UHF NTSC CVBS video transmitter/receiver pair with the following specifications:

• 頻率: 507.25 兆赫 (頻道 20)
• 帶寬: 6 兆赫
• 輸出功率: 250 mW or 500 毫瓦
• Topology: 點對多點 (點對多點)
• 尺寸小而緊湊

為了滿足這些要求, we recommend our digital COFDM solution:

COFDM-912T

Although the customer originally requested an analog/FM UHF system, 我們的 COFDM digital transmission system provides a more stable, interference-resistant, and professional-grade solution — especially in complex RF environments.

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常見問題解答 (常問問題)

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1️⃣ How many receivers can work with one transmitter in P2MP mode?

The COFDM system operates in broadcast mode, similar to a TV station.

✔ One transmitter can transmit to multiple receivers simultaneously.
✔ All receivers within coverage area and properly configured can receive the signal at the same time.
✔ There is no fixed theoretical limit on the number of receivers.

The actual number depends on:

• Signal coverage
• 接收靈敏度
• Antenna configuration
• RF environment conditions

In practical deployments, customers commonly use 5–20 receivers, but technically more are possible as long as signal strength is sufficient.

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2️⃣ Is your system compatible with existing transmitters or receivers?

相容性 cannot be confirmed without technical comparison and testing.

Wireless video systems must match in:

• 頻率
• 帶寬 (6 MHz in this case)
• 調製類型 (COFDM vs analog FM)
• Encoding format
• Protocol parameters

⚠ If your existing equipment is analog FM, it will NOT be compatible with digital COFDM systems.

Because the requested specification mentions NTSC CVBS at 507.25 兆赫 (analog TV channel 20), many legacy systems use analog modulation, while our solution uses digital COFDM modulation.

所以:

✔ Compatibility requires parameter verification
✔ Lab testing is recommended
✔ Without testing, accurate confirmation is not possible

If you can provide your existing equipment specifications, we can help analyze feasibility.

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Why Choose COFDM Instead of Analog FM?

Although analog FM transmitters are still available, COFDM provides major advantages:

✔ Strong Anti-Interference Performance

Stable transmission even in urban or multipath environments.

✔ Better Video Stability

No snow, no ghosting, no gradual degradation like analog.

✔ Flexible Power Options

• 0.5W to 20W customizable
• Suitable for air-to-ground or ground applications

✔ Compact Size

Small transmitter modules available for space-limited applications.

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Typical Application Scenarios

• UAV video transmission
• Ground robotics
• 執法
• Industrial wireless monitoring
• Temporary broadcast links

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Technical Summary

物品	支援
頻率	200–860兆赫 (可客製化, 包含 507.25 兆赫)
帶寬	6 MHz supported
視訊輸入	CVBS (NTSC/PAL制式)
功率	0.5W–20W optional
點對多點	是
調製	Digital COFDM

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Test Videos (2W Power Amplifier Example)

You can see real-world transmission performance here:

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Pricing Reference

Please check our updated price list here:
https://ivcan.com/price-list-for-cofdm-one-way-link-unidirectional-transmission/

(注意: Distance data shown is air-to-ground testing; ground usage may vary.)

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Need Help Selecting the Right Model?

If you are currently using an analog UHF system and considering an upgrade — or if you need a customized frequency such as 507.25 MHz — we are happy to assist.

Please share:

• 頻率
• Required distance
• 環境 (城市的 / 鄉村的 / 空對地)
• Existing equipment details (if any)

We will recommend the best configuration for your project.