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A1801 Series (Low-Band 27–54 MHz)

Low-Band Base-Loaded NMO Antenna


The A1801 Series is a unity-gain low-band NMO antenna with frequency-specific series-fed and shunt-fed options across the 27–54 MHz nominal range.

  • Matches low-band radios through separate series-fed or shunt-fed configurations.
  • Handles up to 200 W with unity-gain omnidirectional coverage.
  • Uses multiple base seals to limit moisture entry at the antenna assembly.
  • Adds an optional shock spring when the approved suffix is specified.

Customization: Cable type, cable length, and connectors can be configured for specific installation requirements.

Product Description

The A1801 Series addresses low-band vehicle radio requirements with separate series-fed and shunt-fed configurations. Each model is selected for a defined portion of the nominal 27–54 MHz range; one shunt-fed option begins at 26 MHz and is retained as a documented exception.

A wide loading coil supports the low-band electrical length within a 52-inch maximum stainless-steel whip. Brite or black finishes and an optional shock spring allow the base configuration to be matched to vehicle-service requirements once the exact suffix convention is confirmed.

Ideal applications: vehicle-mounted low-band LMR systems requiring a tuned base-loaded whip.

Example Model Configurations: A1801A-27, A1801A-30, A1801A-34, A1801A-40, A1801A-47, A1801AH-27, A1801AH-30, A1801AH-34, A1801AH-37, A1801AH-39, A1801AH-45, A1801AH-47, A1801AS-27, A1801AS-30, A1801AS-34, A1801AS-40, A1801AS-47, A1801B-27, A1801B-30, A1801B-34, A1801B-40, A1801B-47, A1801BH-27, A1801BH-30, A1801BH-34, A1801BH-37, A1801BH-39, A1801BH-45, A1801BH-47, A1801BS-27, A1801BS-30, A1801BS-34, A1801BS-40, A1801BS-47

Key Specifications

Feature Specification
Technology LMR / P25
Frequency

LMR / P25: 27–54 MHz nominal series; 26–31 MHz shunt-fed option

Gain

LMR / P25: Unity

Configuration 1 RF feed
Connector / Cable

LMR / P25 connector: spring-loaded contact through NMO mount

Mounting Standard TAD/NMO mount; optional shock spring
Dimensions 52.00 in (1.3 m) maximum length
Material

Housing: ABS base housing

Base: Triple-plated chrome brass / ABS base assembly

Element: Tapered stainless-steel whip; 0.125 in brite or 0.100 in black

VSWR

LMR / P25: <1.5:1

Maximum Input Power

LMR / P25: 200 W

Models & Configurations

Model / Configuration Configuration Details
A1801A-27 27-31 MHz; Chrome / brite finish
A1801A-30 30-35 MHz; Chrome / brite finish
A1801A-34 34-40 MHz; Chrome / brite finish
A1801A-40 40-48 MHz; Chrome / brite finish
A1801A-47 47-54 MHz; Chrome / brite finish
A1801AH-27 26-31 MHz; Chrome / brite finish
A1801AH-30 30-35 MHz; Chrome / brite finish
A1801AH-34 32-37 MHz; Chrome / brite finish
A1801AH-37 36-40 MHz; Chrome / brite finish
A1801AH-39 39-45 MHz; Chrome / brite finish
A1801AH-45 45-54 MHz; Chrome / brite finish
A1801AH-47 47-54 MHz; Chrome / brite finish
A1801AS-27 27-31 MHz; Chrome / brite finish
A1801AS-30 30-35 MHz; Chrome / brite finish
A1801AS-34 34-40 MHz; Chrome / brite finish
A1801AS-40 40-48 MHz; Chrome / brite finish
A1801AS-47 47-54 MHz; Chrome / brite finish
A1801B-27 27-31 MHz; Black
A1801B-30 30-35 MHz; Black
A1801B-34 34-40 MHz; Black
A1801B-40 40-48 MHz; Black
A1801B-47 47-54 MHz; Black
A1801BH-27 26-31 MHz; Black
A1801BH-30 30-35 MHz; Black
A1801BH-34 32-37 MHz; Black
A1801BH-37 36-40 MHz; Black
A1801BH-39 39-45 MHz; Black
A1801BH-45 45-54 MHz; Black
A1801BH-47 47-54 MHz; Black
A1801BS-27 27-31 MHz; Black
A1801BS-30 30-35 MHz; Black
A1801BS-34 34-40 MHz; Black
A1801BS-40 40-48 MHz; Black
A1801BS-47 47-54 MHz; Black

Tech Documents & Resources

a1801-data-sheet

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