On this article, we’re diving into the usage of 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 a vital position in safeguarding your gear.
RF dummy masses might be bought from numerous 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 vital issues.
Additional Studying: TX16S Detachable Antenna Mod
When antennas are absent, the facility from the transmitter displays again into its output circuitry, probably inflicting speedy warmth build-up and injury, notably to the output transistor. Some radio transmitters might provide inside safety and warnings if an antenna is lacking, nevertheless it’s all the time higher to err on the aspect of warning.
Picture credit score: SnowLeopardFPV (https://intofpv.com/t-homer-simpson-moment)
RF terminations, or dummy masses, are wonderful for safeguarding transmitters if 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 if you happen to overlook to reattach antennas but in addition hold the SMA connector free from mud and particles.
Apparently, 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 sometimes, just one output is used at a time. It means that you can 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 check with a multimeter . Measure the impedance between the center pin and the skin. A correctly functioning dummy load ought to present a studying round 50 ohms. This easy test ensures your gear features optimally.
Conclusion
Incorporating RF dummy masses is useful for safeguarding VTX, radio transmitters, and optimizing sure sort of antennas, providing a easy but efficient resolution to boost your FPV gear’s longevity and effectivity.
Edit Historical past
- Jun 2021 – Article created
- Dec 2023 – Up to date
