Waterproof SMA Extension Cable SMA Male to SMA Female Bulkhead Mount with O-Ring M16, Low Loss Coaxial Jumper Compatible with Kenwood Yaesu Marine Radio, SDR Dongle, 4G LTE Antenna Pack of 2

M16 refers to the metric thread specification of the coupling nut used to secure the SMA female bulkhead to the panel — M16 x 1.0mm thread pitch is standard for SMA bulkhead connectors. To install, drill a hole of approximately 16mm (5/8 inch) diameter in the enclosure panel, insert the SMA female connector body through the hole from the outside, and thread the M16 coupling nut onto the protruding body from the inside. Tighten until the O-ring between the connector flange and the outer panel face is visibly compressed — typically 1.5 to 2 turns past finger-tight. Do not overtighten, which can split or extrude the O-ring.

RTL-SDR dongles and similar devices have SMA female ports rated for approximately 500 mating cycles. Frequent antenna swaps — connecting and disconnecting antennas for different frequency bands — wear down the SMA threads and center contact over time, eventually causing intermittent connections or requiring port replacement. With this extension cable plugged in permanently, all antenna connections are made at the cable's SMA female bulkhead end rather than the dongle's port. The cable is inexpensive to replace if worn; the dongle's port is expensive to repair.

Yes — the product description specifically calls out marine environments. The O-ring seal prevents water ingress at the panel mounting point, which is the primary concern for through-panel connectors on boats where spray, rain, and condensation are constant factors. RG316's PTFE jacket is also resistant to UV degradation and ozone, both of which are present in marine environments. For below-waterline or fully submerged installations, additional sealing at the cable jacket entry point would be needed, but for topside and cabin installations this cable provides appropriate weatherproofing.

Most Kenwood (TH-D74A, TH-K20A, TH-G71) and Yaesu (FT-60R, VX-6R, FT-70DR) handheld radios use standard SMA female antenna ports — center hole, external threads. This cable's SMA male end is compatible with those ports. Some older Kenwood and Yaesu models used non-standard connectors. Verify your specific model uses standard SMA female by checking the manufacturer's specifications, or by examining the antenna port — if you see a center hole with external threads and the included rubber duck antenna has a center pin, it is standard SMA.

RG316 has a PTFE (Teflon) dielectric and outer jacket, giving it a temperature rating of -65°C to +200°C and superior UV and chemical resistance compared to RG174's polyethylene/PVC construction (rated to approximately 80°C). For marine, vehicle, and outdoor applications where temperature extremes, UV exposure, and chemical contact (fuel, salt water, cleaning agents) are possible, RG316 provides a significantly longer reliable service life. The double-shielded construction of RG316 also provides better EMI rejection in electrically noisy vehicle and industrial environments.

Many applications require two antenna connections simultaneously — for example, a dual-band VHF/UHF radio with two antenna ports, a MIMO LTE module with two SMA ports, or a setup with separate receive and transmit antenna paths. The 2-pack covers both ports of dual-antenna equipment without requiring a second order. Having a spare is also practical for mission-critical installations in vehicles or on boats where a failed cable during a voyage or emergency deployment cannot be easily replaced.