On this article, we’re diving into using RF dummy hundreds for VTX (video transmitter), radio transmitters, and Triple Feed Patch antennas. These units are self termination circuit with a 50-ohm impedance and an SMA/RP-SMA connector, that are used for dissipating RF vitality. Referred to as “RF terminations,” they play an important position in safeguarding your gear.
RF dummy hundreds 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 vital issues.
Additional Studying: TX16S Detachable Antenna Mod
When antennas are absent, the ability from the transmitter displays again into its output circuitry, doubtlessly inflicting fast warmth build-up and harm, notably to the output transistor. Some radio transmitters might supply inner safety and warnings if an antenna is lacking, however it’s at all times higher to err on the aspect of warning.
Picture credit score: SnowLeopardFPV (https://intofpv.com/t-homer-simpson-moment)
RF terminations, or dummy hundreds, are wonderful for shielding 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 when you overlook to reattach antennas but additionally maintain the SMA connector free from mud and particles.
Curiously, dummy hundreds might be helpful for altering VTX channels within the area. Since they emit considerably much less sign than a correct antenna, they reduce interference with different pilots.
Dummy hundreds 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 lets you 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 straightforward verify ensures your gear features optimally.
Conclusion
Incorporating RF dummy hundreds is helpful for shielding VTX, radio transmitters, and optimizing sure sort of antennas, providing a easy but efficient answer to reinforce your FPV gear’s longevity and effectivity.
Edit Historical past
- Jun 2021 – Article created
- Dec 2023 – Up to date