How to check the output power of the transmitter TX900

Our drone video and data wireless link TX900, besides the communication module’s own 300 milliwatt amplifier, it can also be added with an additional 2-watt, 5-watt, and 10-watt amplifiers to support longer transmission range and stronger signal.

Some customers ask us how to check the output power of the transmitter. We can enter the at command in the management page, Debug Page to obtain the output power amplifier of the current device.

We have a new version of our page management, and the new software version already includes the output power of the external amplifier. (In the old version of the page management page shipped before, TX output does not include the power of the external amplifier, so there is a difference.)

Enter “AT ^ CONFIG?” command in the “At Command” column to query internal configuration parameters of the system.

Please enter this command here, and you will get a red rectangle result. Send me a screenshot so that I can know what the configuration of your device is. The feedback from your device shows that the TX output includes the amplifier. Therefore, you need to set it to “33” in the web UI (after setting it to 33, the actual output power will be around 35dBi)

The picture above is the feedback from the customer’s input command. The middle number of this command result is 14, which means the output power of the external amplifier is 14dBm.

You can also go to the debug page and send the AT^DRPS? command to read the gain configured on the communication module.

The result is usually 19. then 19+14=33dBm. This means that the output power amplifier of the current device should be 33dbm, which is a two-watt power amplifier.

Of course, this test result is for reference only, because there are still some special things that need attention.

1. Our output power will be automatically adjusted according to the transmission distance and load. If it is unloaded, the output power of antenna 1 will not be accurate if you directly test it.
2. For example, the output power of the antenna is different when the transmission distance is 0.1 km and 30 km.
3. Whether you only transmit flight control data or load camera video data will also result in a difference in output power.