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onelinkmore SMA Connector FPV Antennas Radio Adapter SMA Female to Female Barrel Adapter Antenna Jack Adapter SMA Coupler Adapter for Wireless LAN Devices Coaxial Cable Pack of 2
onelinkmore SMA Connector FPV Antennas Radio Adapter SMA Female to Female Barrel Adapter Antenna Jack Adapter SMA Coupler Adapter for Wireless LAN Devices Coaxial Cable Pack of 2
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--- QUICK SPEC REFERENCE --- Product: SMA Female to Female Barrel Adapter (SMA Coupler) SKU: OL1186 Connector A: SMA Female (center hole, external threads) Connector B: SMA Female (center hole, external threads) Body Material: Brass, Pure Copper Housing Impedance: 50 Ohm Applications: WLAN, FPV, cellular 3G/4G, extending SMA cables Quantity: 2 adapters per pack Price: $5.99 In Stock: Yes ---
This SMA female-to-female barrel adapter (also called an SMA coupler or gender changer) joins two SMA male plugs end-to-end, effectively extending an SMA cable or connecting two SMA-terminated cables without soldering or re-terminating. The adapter accepts SMA male plugs at both ends, making it suitable for extending antenna cables, coupling test equipment to antenna ports, and connecting two SMA male pigtail cables in series wherever a longer cable is needed but replacement is impractical.
Common applications include extending WiFi router pigtail cables to reach an external antenna mounting point, coupling an SMA-terminated antenna cable to an SMA-terminated SDR dongle or FPV receiver, connecting two sections of SMA-male-terminated coaxial cable for temporary extensions on test benches, and providing a coupler point in antenna distribution systems. The pure copper housing and brass body provide good RF conductivity and mechanical durability for repeated mating cycles.
This is a standard SMA female-to-female adapter — both ends have a center hole and accept SMA male plugs (with center pins). It is NOT an RP-SMA coupler. RP-SMA female-to-female couplers have center pins on both ends and are used with RP-SMA male (center hole) plugs. Verify your cables and equipment use standard SMA male connectors (center pin) before ordering. Standard SMA is used on RTL-SDR dongles, most RF test equipment, handheld radios, and cellular signal equipment; RP-SMA is used on WiFi routers and FPV video transmitters.
Frequently Asked Questions
An SMA barrel adapter (SMA F-F coupler) joins two SMA male connectors in line. The most common uses are: extending an SMA cable that is too short by coupling it to a second cable; connecting an antenna pigtail cable (SMA male) to a test instrument port extension cable (also SMA male); creating a connection point in an antenna system where two cable sections meet; and adapting SMA male to SMA male in configurations where both sides have male connectors and a coupler is needed to join them.
A quality SMA barrel adapter introduces approximately 0.1–0.2 dB of insertion loss at frequencies below 3 GHz — negligible for practical WiFi, SDR, and cellular applications. The connection quality matters more than the adapter itself: ensure both SMA male plugs are properly threaded into the coupler (finger-tight plus 1/4 turn) to maintain 50 ohm impedance continuity. A loose connection introduces far more signal loss than the adapter's inherent insertion loss.
Yes. RTL-SDR Blog v3 and most RTL-SDR dongles have SMA female ports. The included antenna cable has an SMA male plug. If you need a longer antenna cable, connect your existing cable's SMA male end to one side of this coupler, and connect a second SMA-male-terminated cable of any desired length to the other side. The coupler passes the signal from one cable to the next with minimal loss.
It depends on the connector type. Many FPV video transmitters use RP-SMA (Reverse Polarity SMA) connectors, which have a center pin rather than a center hole. This standard SMA female-to-female coupler will NOT mate with RP-SMA male connectors — the center pin of the RP-SMA male will contact the wrong part of the coupler. Check whether your FPV transmitter and antenna use standard SMA (center hole on the female end) or RP-SMA (center pin on the female end) before ordering.
Standard SMA connectors are specified for a minimum of 500 mating cycles. Quality brass SMA couplers typically exceed this specification in normal use. For a bench adapter that is connected and disconnected daily, this provides several years of service before wear begins to affect connection consistency. For permanent or semi-permanent installations where the coupler is rarely disconnected, the service life is effectively indefinite.
Having two couplers is useful for dual-antenna systems (such as MIMO WiFi setups requiring two antenna connections) or for test benches where the same coupling is needed at two measurement points simultaneously. A spare is also valuable since barrel adapters are frequently used in field applications where loss or damage is possible, and having a replacement prevents interruption of an ongoing test or monitoring session.
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