T20R20 Real Flight Test

Unlocking the Skies: T20R20 Real Flight Test Unveils Pinnacle Performance and Crucial Tips

12/30/20233 min read

Test Environment: Suburb

T20R20 Real Flight Test

  • Model: T20R20 Android GCS with 10km grade video link

  • Flight Height: 190-200m

  • R20 Air Unit: 2*Glue Stick Antenna

  • T20 GCS: 2*Glue Stick Antenna

Communication Range Achievement: 9.8km with Clear Video Transmission

Test Video 1:

  • T20 is placed on the ground, achieving a flight range of 6km, demonstrating the video link's robust penetration capability.

Suggestion 1: Optimal GCS Placement

  • We recommend placing the GCS 1.5m above the ground.


  • A. Ground-level placement may result in signal loss due to earth curvature.

  • B. Ground absorption can weaken communication signals.

Suggestion 2: Antenna Adjustment

  • In case of poor communication, access the web configuration interface, check SNR values, and promptly adjust antenna orientation based on real-time SNR feedback.

Test Video 1


  • At a transmission range of 6900m, ground antennas in parallel alignment with airborne units achieve an SNR value of 8, indicating a robust signal.

  • Adjusting the antennas to a higher position results in an SNR value of 3, indicating a weaker signal.

  • Further elevation to a much higher position reduces the SNR value to 0, indicating a significantly degraded signal.

  • Lowering the antennas restores SNR values to 10 and 7.


  • Antenna polarization alignment is crucial for wireless communication, ensuring optimal signal strength and minimizing attenuation for effective signal transmission.

Test Video 2

Test Video 2:

  • Demonstrates a remarkable 9.8km communication range with fluent video transmission.

Related Technical Terms

  1. SNR stands for "Signal-to-Noise Ratio." It is a measure used in communication to quantify the strength of a signal relative to the background noise. A higher SNR indicates a stronger, more reliable signal, while a lower SNR suggests that the signal may be more prone to interference or degradation by noise. In the context of the T20R20 Real Flight Test, monitoring the SNR value helps ensure optimal communication performance by assessing the quality of the received signal.

  2. Antenna polarization refers to the orientation of the electric field produced by an antenna concerning a reference point, usually the Earth's surface. It is crucial for wireless communication systems, and it comes in different types, including linear polarization and circular polarization.

  3. Linear Polarization: The electric field oscillates in a straight line along a specific axis. It can be vertically polarized (oscillating up and down) or horizontally polarized (oscillating side to side).

  4. Circular Polarization: The electric field rotates in a circular pattern. It can be right-hand circular polarization (RHCP) or left-hand circular polarization (LHCP), depending on the direction of rotation.

The polarization direction of antennas in communication systems needs to be aligned for optimal signal reception. Matching the polarization of the transmitting and receiving antennas helps maximize signal strength, reducing signal degradation and ensuring effective communication.

Flight performance can be influenced by various factors. If you encounter any issues during your flight using our GCS, please don't hesitate to reach out for assistance.