Problem & Solution
In RF and wireless installations, one of the most common frustrations is discovering a mismatch between equipment ports and antenna cables. Standard SMA and Reverse Polarity SMA (RP-SMA) look almost identical on the outside, but their internal pin and socket configurations are inverted. Connecting an SMA male to an RP-SMA female directly can result in either physical damage or a lack of electrical contact because the center pins collide or fail to meet.
The FJP-820 straight RF coaxial converter serves as an inline mechanical adapter that bridges these incompatible connector styles. By converting the thread and pin configurations between SMA and RP-SMA, it allows users to connect existing antennas, extension cables, or test gear without cutting, soldering, or replacing entire cable assemblies.
Who Is It For?
This RF adapter is suited for wireless technicians, FPV drone builders, radio amateurs, and IoT developers working with Wi-Fi antennas, software-defined radios (SDR), or wireless transmitters. It is intended for anyone needing to resolve gender or polarity mismatches between SMA and RP-SMA hardware components.
Key Features
- Brass ConstructionProvides solid metallic threading and mechanical stability for threaded RF hardware couplings.
- Straight Inline ConfigurationMaintains a direct coaxial signal path without altering cable angles or requiring complex right-angle routing.
- SMA to RP-SMA AdaptationSolves pin and socket inversion issues between standard SMA and reverse polarity wireless hardware.
- Compact Form FactorAdds minimal length to the coaxial interconnect, preserving space inside tight enclosures or drone frames.
- FJP-820 Model StandardAllows precise identification of straight adapter specs for targeted replacements or bench setups.
Technical Specifications
| Model | FJP-820 |
| Connector Type | SMA / RP-SMA Series RF Coaxial Adapter |
| Adapter Orientation | Straight |
| Body Material | Brass |
| Gender/Polarity Configuration | Male Plug & Female Jack converter variants |
| Operating Frequency Range | Not specified in available product data |
| Impedance Rating | Not specified in available product data |
| Water / Ingress Resistance | Not specified in available product data |
Pros & Cons
Pros
- Solid brass body construction ensures reliable mechanical coupling.
- Direct straight-through design minimizes extra bulk along cable runs.
- Effectively resolves mismatched pin/hole configurations between SMA and RP-SMA ports.
Cons
- Specific insertion loss (dB) and operational frequency limits (GHz) are not specified in the available product data.
- Adding any inline adapter introduces an additional mechanical interconnect point in the RF path.
- Requires careful visual verification prior to purchase to ensure the correct male/female pin configuration is selected.
FAQ
Standard SMA Male has internal threads with a protruding center pin, while RP-SMA Male has internal threads but a center socket (hole). The female counterparts are similarly inverted. You must inspect the center conductor to confirm compatibility.
According to the product data, this FJP-820 adapter is manufactured from brass.
Specific signal loss metrics, impedance ratings, and maximum operating frequencies are not specified in the available product data.
Final Verdict
A practical brass hardware solution for adapting between standard SMA and RP-SMA coaxial ports. Recommended for technicians and hobbyists needing an inline fix for mismatched antenna threads, provided exact RF frequency and loss parameters are verified for high-precision applications.