Base station extension with measurement lever

P/N 89846-00

The Trimble R980 receiver uses a base station extension pole that increases the height of the receiver to allow clearance for the 450 MHz internal radio antenna and also allows for easy and accurate measurement of the base station antenna height. The extension pole includes a height measurement lever with a defined measurement point:

To measure the height of the base station extension with measurement lever, measure the slant height from the control point on the ground to the height measurement point on the lever. Enter the slant height into the field software (or web interface) and then select the Lever of extension measurement method. The field software (or web interface) automatically calculates the antenna height from the slant height. The base station extension with measurement lever should be used when setting up a base station or static session on an extension leg tripod with tribrach.

The illustration below shows the Trimble R980 receiver with base station extension with measurement lever (P/N 89846-00):

The Base Station Extension with Measurement Lever is available as a standalone accessory (P/N 89846-00) or within the Base Kit or Post processed (PP) Kit.

Base Extension with Measurement Lever (P/N 89846-00):

Base Kit (P/N 89861-00):

PP Kit (P/N 89862-00):

Height measurement methods

The following antenna height measurement methods are available in the field/office software and web interface:

❶ ❷ ❸

Bottom of antenna mount Bottom of quick release Lever of extension