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onelinkmore UHF Adapters Mini UHF Male to UHF Female SO239 PL259 Connector RF Coax Adapter Pack of 2
onelinkmore UHF Adapters Mini UHF Male to UHF Female SO239 PL259 Connector RF Coax Adapter Pack of 2
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--- QUICK SPEC REFERENCE --- Product: Mini UHF Male to UHF Female (SO-239) RF Coax Adapter SKU: OL-2570-2X Connector A: Mini UHF Male Connector B: UHF Female (SO-239) Center Contact: Gold Plated Body: 50 Ohm Compatible Devices: Motorola CDM-1250, Radius M120, and similar legacy mobile radios with Mini UHF antenna ports Quantity: 2 adapters per pack Price: $6.59 In Stock: Yes ---
This adapter converts a Mini UHF male connector to a standard UHF female (SO-239) port, allowing legacy Motorola and similar mobile radio equipment with Mini UHF antenna outputs to use standard PL-259-terminated antennas, coaxial feedlines, and UHF-connector accessories. Mini UHF is a smaller-diameter version of the standard UHF (PL-259/SO-239) connector family, used on certain older Motorola mobile radio platforms including the CDM-1250, Radius M120, and related models. This adapter bridges those radios to the much larger ecosystem of standard UHF-terminated antennas and accessories.
The gold-plated center contact maintains low contact resistance and resists corrosion over the adapter's service life. The 50 ohm impedance matches both the Mini UHF and standard UHF connector standards. This adapter is particularly useful for technicians maintaining or upgrading legacy Motorola fleet radio installations, allowing modern standard-UHF antennas to be used with older radio hardware without re-cabling the entire installation.
Mini UHF and standard UHF connectors are mechanically incompatible — a standard PL-259 will not mate with a Mini UHF port. This adapter is the correct solution for cross-connecting the two standards. Note that Mini UHF is different from standard UHF in size only — the electrical characteristics and 50 ohm impedance are identical. Do not confuse Mini UHF with SMA, which is a different connector standard entirely; SMA adapters will not work in Mini UHF ports.
Frequently Asked Questions
Mini UHF is a scaled-down version of the standard UHF (PL-259/SO-239) connector, approximately half the size of the standard connector. It was used by Motorola on several mobile radio platforms from the 1990s and 2000s, including the CDM-1250, CDM-1550, Radius M120, and M130 series. It also appeared on some Kenwood and Vertex mobile radio models from the same era. The connector is now largely obsolete but remains in service in many fleet radio installations.
Yes. The Motorola CDM-1250 has a Mini UHF female antenna port. This adapter's Mini UHF male end plugs into that port, and the SO-239 (UHF female) end accepts a standard PL-259 (UHF male) antenna connector. This allows any standard PL-259-terminated VHF or UHF mobile antenna to be connected to the CDM-1250 or similar radio without modifying the radio or the antenna.
At VHF (136–174 MHz) and UHF (400–512 MHz) commercial radio frequencies, a quality Mini UHF-to-UHF adapter introduces negligible insertion loss — well under 0.2 dB. This is imperceptible in practical mobile radio communication range. The gold-plated contacts maintain low resistance, and the 50 ohm impedance continuity ensures no significant VSWR increase from the adapter alone.
The adapter has a Mini UHF male end and a UHF female (SO-239) end. Used as described, the Mini UHF male plugs into the radio's Mini UHF female port and the SO-239 accepts a standard antenna. To use a Mini UHF antenna on a standard UHF radio (SO-239 port), you would need the reverse adapter — Mini UHF female to UHF male (PL-259). This pack is specifically for Mini UHF male to UHF female conversion.
Fleet radio installations often involve multiple vehicles or stations requiring the same adapter. The 2-pack provides immediate coverage for two radios, or one adapter for immediate use and one spare for the service kit. In commercial radio maintenance, having spare adapters on hand prevents vehicle downtime when an adapter is lost or damaged during antenna servicing.
No. Mini UHF and SMA are completely different connector standards despite both being smaller than standard UHF. Mini UHF uses a bayonet-style locking mechanism similar to BNC but sized for the UHF connector geometry. SMA uses threaded coupling with a different body diameter and pin geometry. Mini UHF ports on Motorola radios will not accept SMA connectors, and vice versa. The two standards are not interchangeable.
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