FireFly™ Central Radio Unit (CRU) User Guide
Table of Contents Overview: Central Radio Unit (CRU)..............................................................................3 About Central Radio Unit (CRU)................................................................................3 Regulatory and Safety Guidelines................................................................................3 Certification Licensing.....................................................................................................................
Overview: Central Radio Unit (CRU) About Central Radio Unit (CRU) The CRU is a central radio controller with firmware that manages the timing of events and low-level radio communication. The CRU consists of the main CRU device, a Base End Assembly (BEA) and a Head End Assembly (HEA). These three discrete devices make up the CRU. The CRU is intended for use by properly trained seismic field personnel.
NOTE: In United States, for the 217 – 220 MHz band, the maximum antenna height above average terrain (HAAT) is 152 meters (500 feet). Improper installation could void the user’s authority to operate the equipment. Certification Certification, covers technical parameters of the equipment related to emissions that can cause interference. Certification is granted to the manufacturer or importer of the transmission equipment, independent from the operation or licensing of the units.
Licensing Many countries require that the operator of a radio, or radio modem, obtain a license prior to operating the radio, or radio modem. Some do not. Consult your local communications governing agency for licensing information. Obtaining an operator’s permit or license for the Firefly CRU for the location or country-of-use is the responsibility of the end user. Before operating this radio modem, you are legally required to obtain frequency licenses as required by the country-of-use.
Figure 2. FCC ID Label Location: CRU Radio Input/Output, Inc.
Deploying and Operating the CRU Before you begin Deploy the CRU by attaching it to the base of the antenna mast. Connect the Base End Assembly (BEA) portion of the CRU, also attaching to the base of the antenna mast. Attach the Head End Assembly (HEA) near the top of the antenna mast, connecting the interconnect cables between the CRU, BEA, and HEA. The CRU will be connected to the CSC via a weatherized Ethernet cable or bridge. Bringing up the CRU 1. Turn on the CSC. 2.
