On this article, we’re diving into using RF dummy masses 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 connector, that are used for dissipating RF vitality. Often called “RF terminations,” they play an important position in safeguarding your gear.

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RF dummy masses might be bought from varied distributors, together with:

Eradicating antennas out of your FPV drone and radio makes it simpler to pack for travelling. Nonetheless, powering them up with out reattaching the antennas can result in important issues.

Additional Studying: TX16S Detachable Antenna Mod

When antennas are absent, the ability from the transmitter displays again into its output circuitry, doubtlessly inflicting speedy warmth build-up and harm, notably to the output transistor. Some radio transmitters could provide inner safety and warnings if an antenna is lacking, but it surely’s at all times higher to err on the facet of warning.

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RF terminations, or dummy masses, are wonderful for safeguarding transmitters once you select to take away the antenna, whether or not it’s a 5.8GHz VTX or a 2.4GHz/900MHz RC transmitter. These small and cost-effective gadget not solely defend your gear in case you neglect to reattach antennas but additionally preserve the SMA connector free from mud and particles.

Curiously, dummy masses might be helpful for altering VTX channels within the subject. Since they emit considerably much less sign than a correct antenna, they decrease interference with different pilots.

Dummy masses are notably helpful for Triple Feed Patch antennas (product web page: https://s.click on.aliexpress.com/e/_DdxtiWD). These antennas include two outputs, RHCP and LHCP, however usually, just one output is used at a time. It permits you to swap between these polarizations any time you need. Attaching a dummy load to the unused output prevents sign leakage, thereby enhancing the antenna’s efficiency and effectivity.

Triple Feed Patch Antenna with Dummy Load on One Output

Earlier than utilizing a dummy load, it’s advisable to take a look at with a multimeter . Measure the impedance between the center pin and the surface. A correctly functioning dummy load ought to present a studying round 50 ohms. This easy verify ensures your gear features optimally.

Conclusion

Incorporating RF dummy masses is helpful for safeguarding VTX, radio transmitters, and optimizing sure kind of antennas, providing a easy but efficient answer to boost your FPV gear’s longevity and effectivity.

Edit Historical past

• Jun 2021 – Article created
• Dec 2023 – Up to date