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®

 

PN 

2558814

   November 2005   

©2005 Fluke Corporation. All rights reserved. Printed in U.S.A.

  

2635A-RF900USB 

900 MHz RF USB Modem 

Instruction Sheet 

Introduction 

The 2635A-RF900USB 900 MHz RF USB Modem 

(referred to as “the Modem”) is a radio-frequency 

transceiver that, used together with the 2635A-RF900 

Serial RS-232 Modem, creates a wireless link 

between Fluke Hydra Series Data Loggers and a 

computer (PC) running Hydra application software.  

Note 

The modem operates in the 900 MHz 

frequency range and is approved by the FCC 

for use in the United States. Operation in 

other countries may violate local regulations. 

When operating outside the United States, 

check with the appropriate governing agency 

in the host country prior to Modem operation.  

This instruction sheet assumes familiarity with the 

Hydra software and Hydra Series Data Logger 

operation. If unfamiliar with Hydra software or the 

Hydra Series hardware, refer to the software user’s 

documentation or the appropriate Hydra Series Users 

manual. The Modem is shown in Figure 1.  

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Power Adapter Jack

USB Port
Connector

Data Out

Data In

Power Indicators

Antenna

Config
Switch

 

Reset
Switch

 

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Figure 1. 2635A-RF900USB 900 MHz RF USB Modem 

Contacting Fluke 

To locate an authorized service center, visit us on the 

World Wide Web at 

www.fluke.com

 

or call Fluke 

using any of the following numbers: 
USA:  1-888-99-FLUKE (1-888-993-5853) 

Canada:  1-800-36-FLUKE (1-800-363-5853) 

Europe:  +31 402-678-200 

Japan:  +81-3-3434-0181 

Singapore:  +65-738-5655 

Anywhere in the world:  +1-425-446-5500 

Shipping Contents 

The Modem comes with the following items:  

 

Instructions for use with the Hydra Series (this 

sheet)  

 

Quick Start Guide  

 

CD-ROM with documentation and software  

 

½ wave Dipole Antenna  

 

USB (Universal Serial Bus) 6 ft. cable 

Requirements  

The Modem requires a PC with one free USB port 

and Windows XP, 2000, or 98 SE.  

Installation  

Each wireless system requires two modems – one 

base station connected to a PC, and one remote station 

connected to a Hydra Data Logger. This USB Modem 

is used as a base station connected to the PC; the 

remote station connected to the Hydra is a 2635A-

RF900 Serial RS-232 Modem.  
To ease system setup, the Modem’s factory default 

settings are correct for proper PC-to-Hydra operation 

without further adjustments. There are no setup 

differences between the base and remote stations.  

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