Why Use RF Dummy Load on VTX, Radio, and Antenna


In this post, we’re diving into using RF dummy loads for VTX (video transmitter), radio transmitters, and Triple Feed Patch antennas. These gadgets are self termination circuit with a 50-ohm impedance and an SMA/RP-SMA port, which are utilized for dissipating RF energy. Called “RF terminations,” they play a vital function in securing your devices.

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RF dummy loads can be bought from numerous suppliers, consisting of:

Removing antennas from your FPV drone and radio makes it simpler to load for taking a trip. Powering them up without reattaching the antennas can lead to considerable issues.

Further Reading: TX16S Removable Antenna Mod

When antennas are missing, the power from the transmitter shows back into its output circuitry, possibly triggering quick heat accumulation and damage, especially to the output transistor. Some radio transmitters might provide internal security and cautions if an antenna is missing out on, however it’s constantly much better to err on the side of care.

rf dummy load fpv drone radio transmitter

Image credit: SnowLeopardFPV (https://intofpv.com/t-homer-simpson-moment)

RF terminations, or dummy loads, are outstanding for safeguarding transmitters when you select to get rid of the antenna, whether it’s a 5.8 GHz VTX or a 2.4 GHz/900MHz RC transmitter. If you forget to reattach antennas however likewise keep the SMA port complimentary from dust and particles, these affordable and little device not just safeguard your devices.

Interestingly, dummy loads can be helpful for altering VTX channels in the field. Considering that they give off considerably less signal than an appropriate antenna, they reduce disturbance with other pilots.

Dummy loads are especially helpful for Triple Feed Patch antennas (item page: https://s.click.aliexpress.com/e/_DdxtiWD). These antennas feature 2 outputs, RHCP and LHCP, however generally, just one output is utilized at a time. It enables you to change in between these polarizations whenever you desire. Connecting a dummy load to the unused output avoids signal leak, consequently boosting the antenna’s efficiency and effectiveness.

rf dummy load termination triple feed patch antenna rhcp lhcp

Triple Feed Patch Antenna with Dummy Load on One Output

Before utilizing a dummy load, it’s suggested totest with a multimeter Procedure the impedance in between the middle pin and the exterior. A correctly working dummy load need to reveal a checking out around 50 ohms. This easy check guarantees your devices operates efficiently.


Incorporating RF dummy loads is helpful for safeguarding VTX, radio transmitters, and enhancing particular kind of antennas, using a basic yet reliable service to improve your FPV devices’s durability and effectiveness.

Edit History

  • Jun 2021– Article developed
  • Dec 2023– Updated


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