Yaesu GS-680U Universal Mast Bearing for Antenna Rotators

The Yaesu GS-680U is a universal mast bearing / upper thrust bearing designed for use in rotating antenna installations with compatible Yaesu rotators.

This accessory is used to support and stabilise the antenna mast above the rotator, helping maintain smoother rotation and reducing lateral stress applied directly to the rotator, especially in installations with directional antennas exposed to wind or mechanical load.

The GS-680U accepts mast diameters from 35 to 68mm and provides up to 5° tilt compensation, making installation easier when there is slight misalignment between mast and rotator.

The mast is secured using two mast clamps, providing stable mechanical support. The bearing can be disassembled, allowing installation on an existing mast without fully removing the antenna, depending on the installation setup.

It is suitable for use with compatible Yaesu rotators, including models such as G-2800DXC, G-1000DXC and G-450CDC, according to supplier information. It is a recommended solution for improving mechanical stability in towers, masts and rotating antenna systems.

Main features

Universal mast bearing
Manufacturer / brand: Yaesu
Model: GS-680U
Reference: A04800001
Accessory type: upper bearing / thrust bearing / universal bearing
Main application: support and stabilisation of rotating mast
Listed compatibility: Yaesu G-2800DXC
Listed compatibility: Yaesu G-1000DXC
Listed compatibility: Yaesu G-450CDC
Compatible mast diameter: 35 to 68mm
Tilt compensation: up to 5°
Mast fixing: two mast clamps
Approximate weight: 1.3 to 1.4kg
Installation on existing mast: possible, due to disassemblable construction
Mounting holes: similar pattern to GS-65, according to available technical information
Mechanical application: upper support to reduce side load on the rotator
Original Yaesu product
Rotator not included
Mast, antenna, tower and control cable not included
Suitable for directional antenna installations and rotating systems

Listed contents

Yaesu GS-680U universal bearing
Mounting screws
Washers
Hexagon / Allen spanner
Quick guide, depending on manufacturer/distributor supply

Recommended applications

Installations with compatible Yaesu rotators
Directional antenna systems
Yagi antennas
Rotating HF, VHF or UHF antennas, depending on installation mechanical load
Towers and masts with antenna rotator
Amateur radio base stations
Installations requiring reduced side load on the rotator
Improved mast mechanical stability
Upper support in antenna rotation systems
Installations using 35 to 68mm masts

Important note

Before purchase and installation, always confirm the mast diameter, rotator model, antenna weight, wind load, installation height, mechanical alignment, tower type, fixing points and compatibility with the existing system.

The Yaesu GS-680U helps support and stabilise the mast, but it does not replace a complete mechanical assessment of the installation. The choice of rotator, bearing, mast and support must match the real antenna load, wind conditions and structural safety of the tower.

Installation should be carried out with proper tightening, correct alignment and compatible materials. For outdoor installations, regularly check screws, clamps, corrosion, mechanical play and rotation system operation.

This item corresponds to the Yaesu GS-680U universal mast bearing. Rotator, antenna, mast, tower, cables and other accessories are not included unless expressly stated otherwise.