RF Connectors Explained: Types, How to Identify Them, and Crimp vs Solder

RF connectors are used to join coaxial cables to antennas, radios, and RF equipment while maintaining signal integrity. Choosing the right connector—and terminating it correctly—is critical for performance, durability, and signal loss.

This guide covers the most common RF connector types, how to identify them, and the difference between crimp and solder terminations.

Male vs Female RF Connectors (Simple Explanation)

In RF and coax systems, “male” and “female” refers to how connectors physically mate together—not electrical performance.

Understanding this is important because mixing them up is one of the most common installation mistakes.

What is a Male Connector?

A male connector has a center pin that sticks out.

Key features:

  • Has a protruding metal pin in the center
  • Usually inserts into another connector
  • Often called the “plug”

Example:

  • SMA male has a center pin
  • N-type male also has a center pin

What is a Female Connector?

A female connector has a recessed socket that receives the pin.

Key features:

  • No protruding center pin
  • Has a hole/socket in the middle
  • Often called the “jack” or “receptacle”

Example:

  • SMA female has a hole in the center
  • N-type female receives the male pin

How They Work Together

Male and female connectors are designed to pair like this:

  • Male (pin) → plugs into → Female (socket)

Once connected, the threaded or locking mechanism secures them together and maintains a stable RF connection.

Common RF Connector Types

SMA / RP-SMA

SMA connectors are small, threaded RF connectors commonly used in antennas and wireless systems.

  • SMA (standard): Pin on male side
  • RP-SMA (reverse polarity): No pin on male side (common in Wi-Fi equipment)

How to identify:

  • Very small size
  • Screw-on threaded body
  • Often found on antennas, routers, and wireless devices

N-Type Connectors

N-type connectors are larger, rugged RF connectors designed for outdoor and high-power use.

How to identify:

  • Larger threaded metal connector
  • Very solid, weather-resistant design
  • Common in outdoor antennas and base stations

BNC Connectors

BNC connectors use a quick twist-lock mechanism.

How to identify:

  • Push-and-twist locking
  • Round connector with two small locking pins
  • Common in test equipment and video/RF systems

TNC Connectors

TNC connectors are similar to BNC but threaded for better vibration resistance.

How to identify:

  • Looks like a threaded BNC
  • Used in mobile and industrial RF systems

How to Identify RF Connectors Quickly

If you’re unsure what connector you have, check these key features:

1. Size

  • Small → SMA / RP-SMA
  • Medium → TNC / BNC
  • Large → N-Type

2. Threaded or push-lock

  • Threaded = SMA, N-Type, TNC
  • Push-and-twist = BNC

3. Pin position

  • SMA male has a center pin
  • RP-SMA male does NOT have a pin (common mistake point)

4. Application context

  • Wi-Fi / small antennas → SMA or RP-SMA
  • Outdoor antennas → N-Type
  • Test equipment → BNC

Crimp vs Solder RF Connectors

There are two main ways RF connectors are attached to coax cable: crimp and solder.

Crimp Connectors

Crimp connectors are installed using a compression or crimping tool that mechanically secures the connector to the cable.

Pros:

  • Fast and repeatable installation
  • Strong mechanical connection
  • Common in professional field installations
  • Consistent performance when done correctly

Cons:

  • Requires proper crimp tool and dies
  • Poor crimps can cause signal loss or failure

Best for:

  • Field work
  • Production installs
  • RF systems requiring consistency and speed

Solder Connectors

Solder connectors use heat to bond the conductor to the connector.

Pros:

  • Very strong electrical connection when done correctly
  • Good for custom or low-volume builds

Cons:

  • Takes more time and skill
  • Risk of overheating or damaging cable dielectric
  • Less consistent in field conditions

Best for:

  • Bench work
  • Custom builds
  • Situations where precision matters more than speed

Which One Is Better?

In most modern RF installations, crimp connectors are preferred because they are:

  • Faster to install
  • More consistent
  • Easier to replicate at scale

Solder is still useful for custom or low-volume work but requires more experience to avoid performance issues.