Product Description
Larsen A4 NMO Mounting Adapter Kit – SO-239 to NMO
The Larsen A4 Mounting Adapter is a practical antenna mounting adapter designed to convert compatible SO-239/UHF female to a standard NMO antenna connection. It allows an NMO-style mobile antenna to be used with an existing base-station or mobile antenna mounting setup.
Key Features
- NMO Conversion: Converts compatible SO-239 to a standard NMO connection.
- Standard NMO Thread: Uses the industry-standard 1-1/8" x 18 thread used on NMO antenna mounts.
- Two-Piece Adapter Kit: Includes the A-1 and A-2 adapter components for the mounting conversion.
- Versatile Installation: Allows NMO mobile antennas to be installed on compatible base-station kits or existing SO-239/UHF female mounting configurations.
- RF Applications: Suitable for many VHF and UHF mobile radio antenna installations.
- Machined Construction: Designed for durable mechanical connection and repeated antenna installation/removal.
- Professional Radio Accessory: Ideal for amateur radio, commercial two-way radio, public safety, fleet, and communications applications.
NMO Thread Specification
The NMO interface uses a 1-1/8" diameter × 18 threads per inch (1-1/8" x 18) thread specification, making it compatible with standard NMO antenna mounting hardware.
Typical Applications
- Converting an existing SO-239/UHF female mount to NMO
- Installing an NMO mobile antenna where a compatible older mounting configuration is already present
- VHF/UHF mobile radio antenna installations
- Amateur radio and commercial communications systems
- Vehicle and base-station antenna mounting applications
Product Description
The Larsen A4 NMO Mounting Adapter Kit provides a convenient way to integrate modern NMO mobile antennas with compatible existing antenna mounting hardware. Its standard 1-1/8" x 18 NMO interface makes it suitable for a wide range of NMO-equipped VHF and UHF antennas.
Part Number: A4-NMO
Type: NMO Mounting Adapter
Thread: 1-1/8" x 18
Application: SO-239 to NMO conversion
Components: A-1 and A-2 adapter pieces
Frequency Applications: VHF / UHF
SO-239 Bulkhead connector not included - Shown for illustration purposes only
