UAV Broadband Relay Guide: How to Build a Drone Wireless Video Radio Link Relay for Mountain-Blocked Long-Range Flights

In long-range UAV operations, mountainous terrain is one of the most common causes of video and control signal degradation. Even with high-power links, 見通し外 (NLOS) conditions can dramatically reduce usable range, leading to pixelated video, unstable control, or complete signal loss.

This article explains how to build a simple and effective UAV broadband wireless link relay system using existing Vcan1933 equipment, based on a real deployment scenario. For more product details, 見る Vcan1933 Drone Link for Long-Range Video & データ.

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1. Problem Description

• Total flight distance required: 35–40 km
• Mountain obstruction: ~11 km from the take-off point
• Current performance:
  • Video available up to ~25 km (highly pixelated, minimal control)
  • No signal beyond 25 キロ
• Available equipment:
  • Vcan1933 8W ユニット (previous system)
  • Vcan1933 2W ユニット (recently purchased)
• Additional advantage:
  • A suitable relay installation location has already been identified

The goal is to reuse existing hardware to overcome the mountain blockage and extend the effective range.

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2. Is the 2W Vcan1933 Suitable for a Relay?

Yes — absolutely.

Because the relay site is only about 11 km from the ground station, a 2W unit is more than sufficient for the ground-side link. The key is to reassign the roles of the existing devices correctly.

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3. Recommended Relay Architecture

Device Role Assignment

位置	デバイス	IPアドレス	Role
Mission UAV	8W Vcan1933 TX	192.168.10.252	スレーブ / 航空ユニット
Relay site (mountain / hill)	8W Vcan1933 RX	192.168.10.250 (before) 192.168.10.253 (後)	リピータ
地上局	2W Vcan1933 RX	192.168.10.250	スレーブ / 地上ユニット

This setup ensures:

• Maximum uplink reliability from the mission UAV
• Strong mid-point signal regeneration at the relay
• Stable short-distance link to the ground station

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4. Step-by-Step Configuration Guide

ステップ 1: Unify the Network ID (Very Important)

Originally, the two Vcan1933 systems operate independently, each with its own ネットワークID.

For a relay system to work:

• All three devices must use the same Network ID
  • Mission UAV (8W TX)
  • Relay unit (8W RX → Repeater)
  • Ground station unit (2W RX)

This allows all units to operate within the same network and forward data correctly.

手術: Change 2W Master Ground Unit ID 25110703 に 20031106 (default ID of 8W set network).

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ステップ 2: Modify the IP Address to Avoid Conflicts

デフォルトでは:

• Vcan1933 マスター (地上ユニット) IPアドレス: 192.168.10.250

If both the 8W Master Ground Unit そして 2W Master Ground Unit keep this default value, an IP conflict will occur.

Action required:

• Change the IP address of the 8W Master (地上ユニット) to a different unused IP, 例えば:
  • 192.168.10.253

Make sure the new IP remains in the same subnet and does not conflict with any other device.

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ステップ 3: Set the Relay Device to Repeater Mode

1. Power on the 8W receiver that will be installed at the relay location
2. Access its management interface:
   • Default IP: 192.168.8.250
3. Log in to the web configuration page
4. Change the device role and IP address:
   • From マスター → リピータ
   • From 192.168.10.250 → R192.168.10.253
5. Save the configuration and reboot if required

Once configured, this unit will:

• Receive the video and control signals from the mission UAV
• Regenerate and forward them toward the ground station

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5. Deployment Tips for Best Performance

• Ensure clear line-of-sight:
  • UAV ↔ Relay
  • Relay ↔ Ground station
• Install the relay antenna at a higher elevation whenever possible
• 使用 longer omnidirectional antennas at the relay site to maximize link quality
• Secure stable power for the relay (battery or fixed power source)
• Test the full system on the ground before flight.

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6. Expected Result

With the relay properly configured:

• The mountain no longer blocks the primary link
• Video quality remains stable beyond 25 キロ
• Control reliability improves significantly
• Total flight distance of 35–40 km becomes achievable under proper RF conditions

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7. 結論

By reusing an existing 8W Vcan1933 unit as a repeater and deploying a 2W Vcan1933 at the ground station, you can build a cost-effective and reliable UAV broadband wireless link relay system. This approach is ideal for long-range UAV missions in mountainous or obstructed environments, without requiring additional custom hardware.

For product details, visit Vcan1933 Drone Link for Long-Range Video & データ.

The product models mentioned in this article, Vcan1933, Vcan1933-2W, Vcan1933-8W.