GEMEK 75ft SMA Male to N Male Coax Cable - Low Loss S-MR400

In this review of the GEMEK 75ft SMA Male to N Male Cable the bottom line is straightforward: this is a heavy-duty, low-loss coax extension best for anyone needing a reliable 50 ohm link between SMA equipment and N-style antennas over a long run. The cable's S-MR400 construction and double shielding are the single biggest reasons to buy, since they preserve signal strength for cellular, WiFi, ADS-B and ham radio uses where every dB of loss matters. The review covers build, compatibility, handling and when this cable is the sensible choice.

Key Features

• All-copper connectors: Gold-plated SMA male to N male plugs deliver corrosion resistance and consistent mating to SMA- and N-style ports.
• Low-loss S-MR400 coax: The 10.3mm diameter S-MR400 cable keeps insertion loss low for long runs, improving range for cellular, WiFi and ADS-B receivers.
• 75 ft length: At 75 ft (23 meters) the cable offers flexible placement options for antennas or surge arresters without adding inline amplifiers.
• Double shielded construction: Extra shielding reduces external interference and helps maintain signal quality in noisy RF environments.
• Rugged handling: A minimum bending radius of about 2.44 in and heat-shrink on both ends mean the cable tolerates tighter bends and clean terminations for installations.

Who It's For

This cable is aimed at installers, radio hobbyists and network professionals who need a long, durable 50 ohm extension from SMA-equipped devices to N-style antennas or surge arresters. It fits use cases such as cellular modems and routers, WiFi repeaters, ADS-B ground stations, ham radio setups and test gear where minimizing loss over distance is important.

Those seeking a lightweight patch cable for short indoor runs or a TV coax solution should look elsewhere, since this product is specifically 50 ohm S-MR400 and not intended for TV or 75 ohm applications. Also note this is not an RP-SMA or F-type cable, so confirm connector gender and type before ordering.

Pros & Cons

Pros

• High-quality build and gold-plated all-copper connectors give reliable, low-resistance connections.
• S-MR400 low-loss coax retains more signal on long runs compared with thinner cables, benefiting cellular and ADS-B reception.
• Double shielding and robust diameter help reject interference in demanding RF environments.
• 75 ft length provides flexible antenna placement without extra adapters or amplifiers.

Cons

• Heavier and stiffer than small-diameter coax, which can make routing in tight spaces more difficult.
• Not suitable for 75 ohm TV applications or for RP-SMA/F-type connector needs.

Specifications

Connector 1	SMA Male plug 50 ohm
Connector 2	N Male plug 50 ohm
Length	75 ft (23 meters)
Coax	Double shielded low-loss S-MR400 (10.3mm / 0.4 in)
Impedance	50 Ohm
Operating temperature	-20C to +70C
Minimum bending radius	2.44 in

Our Verdict

The GEMEK 75ft SMA Male to N Male S-MR400 cable is a practical, well-built extension for anyone linking SMA equipment to N-style antennas where signal retention matters. Its double shielding, substantial center conductor and clean terminations make it good value for installers and radio enthusiasts who need dependable RF performance over longer runs.

Frequently Asked Questions

Will this cable work with my router or modem?
Yes, it is compatible with devices that have an SMA female port and pair to N male antennas; confirm your device uses standard SMA female connectors and a 50 ohm interface.

Is this cable suitable for TV or coaxial antenna feeds?
No, this is a 50 ohm S-MR400 cable intended for RF, cellular, WiFi and ham use, not 75 ohm TV applications.

How flexible is the cable for routing?
The S-MR400 is thicker and stiffer than small patch coax but supports tight bends down to the specified minimum radius and includes heat-shrink on both ends for neat terminations.