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onelinkmore SMA Female to SO239 Adapter (PL-259 Female) Two Way Radio Coax Adapter UHF Kits Connector for Baofeng CB Radio Walkie Talkie SDR UV-5R Series Handheld Radio Base Station Antenna Pack of 2
onelinkmore SMA Female to SO239 Adapter (PL-259 Female) Two Way Radio Coax Adapter UHF Kits Connector for Baofeng CB Radio Walkie Talkie SDR UV-5R Series Handheld Radio Base Station Antenna Pack of 2
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--- QUICK SPEC REFERENCE --- Product: SMA Female to SO-239 (UHF Female) Adapter SKU: OL1676-2X Connector A: SMA Female (center hole, external threads) Connector B: UHF Female / SO-239 (internal threads, center socket) Body Material: Brass, Gold Plated Contacts Impedance: 50 Ohm Compatible With: Baofeng UV-5R, SDR dongles, CB radio base stations, walkie-talkies with SMA male ports connecting to SO-239 antenna systems Quantity: 2 adapters per pack Price: $6.38 In Stock: Yes ---
This adapter converts an SMA female port into a UHF female (SO-239) port, allowing SMA-connector handheld radios, SDR dongles, and small RF devices to use PL-259-terminated base station antennas, coaxial feedlines, and UHF antenna accessories. The SMA female end accepts the SMA male pin from a handheld radio's antenna stub (after removing the rubber duck), and the SO-239 end connects to any standard PL-259 (UHF male) antenna cable or coaxial feedline.
Primary applications include connecting a Baofeng UV-5R or similar SMA-port handheld radio directly to a base station antenna with SO-239 termination for extended-range operation from a fixed location, connecting an RTL-SDR dongle's SMA male port to existing SO-239 antenna infrastructure, and interfacing SMA-connector walkie-talkies with CB radio antenna systems and accessories that use the UHF standard. Gold-plated contacts provide low resistance and corrosion resistance across the adapter's service life.
Connector gender verification is important: the SMA female end of this adapter has a center hole and external threads — it accepts an SMA male plug (with center pin). The SO-239 end has internal threads and a center socket — it accepts a PL-259 (UHF male) plug. This adapter allows an SMA male device to connect to a UHF SO-239 antenna system. If your device has an SMA male port (center pin), connect to this adapter's SMA female end. If you need the reverse — connecting a UHF device to an SMA antenna — a different adapter configuration is required.
Frequently Asked Questions
Yes. Remove the UV-5R's rubber duck antenna to expose the SMA male port. This adapter's SMA female end connects to that SMA male port. The SO-239 end then accepts the PL-259 plug from your base station antenna feedline. This allows the UV-5R to use a high-gain external antenna for significantly extended range compared to the stock rubber duck — useful for fixed-location monitoring, emergency communications setups, or temporary base station operation.
Yes. RTL-SDR dongles have SMA male ports. Many HF and CB antennas terminate in PL-259 (UHF male) connectors that mate with SO-239 (UHF female) ports. This adapter's SMA female end accepts the dongle's SMA male port, and the SO-239 end accepts the antenna's PL-259 plug, allowing you to receive CB (27 MHz), shortwave, and other HF signals with an RTL-SDR dongle using a full-size base station antenna.
Both SMA and UHF (SO-239/PL-259) are 50 ohm connectors, so there is no impedance mismatch at the conversion point. The UHF connector does not maintain precise 50 ohm geometry above approximately 300 MHz, which introduces increasing VSWR at higher frequencies. For Baofeng UV-5R on VHF (144 MHz) and UHF (430–470 MHz), this adapter performs acceptably. For precision RF work at UHF and above, N-type or SMA connectors maintained throughout the signal path provide better VSWR performance.
This adapter is suitable for both transmit and receive at handheld radio power levels (up to approximately 8W). The brass construction and gold-plated contacts handle the power levels of all standard handheld transceivers without issue. For high-power transmitter applications (100W+), heavier-duty adapters with more robust construction are recommended.
SO-239 (UHF female) is the socket that accepts PL-259 (UHF male) plugs. It has been the standard antenna connector for CB radio, HF amateur radio, marine VHF, and many VHF/UHF base station applications since the 1930s. Its large size and robust threaded connection make it suitable for field assembly with gloved hands, and its widespread adoption means virtually all base station antennas and coaxial accessories in these radio services use this connector.
Having two adapters is useful for installations with two radios that both need to connect to the same antenna system, or for keeping one adapter on the radio and one as a field spare. In emergency communications deployments where multiple Baofeng radios are used at a single base station antenna, having spare adapters prevents a single lost or damaged adapter from taking a station offline.
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