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Table of Contents
Troubleshooting
Related Manuals for Garmin GBR 21
Summary of Contents for Garmin GBR 21
- Page 1 GBR 21 beacon receiver owner’s manual reference guide...
- Page 2 Visit the GARMIN website for current updates and supplemental information concerning the use and operation of this and other GARMIN products. Website address: www.garmin.com GARMIN and GBR 21 are registered trademarks of GARMIN Corporation and may not be used without the express permission of GARMIN Corporation. January 2000 Part Number 190-00069-00 Rev.
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Page 3: Introduction
The unit should be securely packaged with the tracking number clearly marked on the outside of the package, and sent freight prepaid and insured to a GARMIN warranty service station. A copy of the original sales receipt is required as the proof of purchase for warranty repairs. GARMIN retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase price at its sole discretion. -
Page 4: Cautions
The GARMIN GBR 21 does not contain any user-serviceable parts. Repairs should only be made by an authorized GARMIN service center. Unauthorized repairs or modifications could void your warranty and... -
Page 5: Table Of Contents
Capabilities & Package Contents...5 Installation Mounting the Receiver ...6-7 Mounting the Antenna ...8 Connecting GBR and GPS ...9-11 Operation Using the GBR 21 ...11-13 Reference DGPS: How It Works ...13-14 Sources of Error ...15-16 Troubleshooting Chart ...17-18 GBR 21 Specifications ...19 Index ...20... -
Page 6: List Of Figures
Screen Example: GPS 12/12XL/48 Main Menu...8 Screen Example: GPS 12/12XL/48 Input/Output Settings...8 Screen Example: GPS 12/12XL/48 Beacon Receiver Setup Page...9 Figure 3: Sample Wiring Diagram for GARMIN GPS units...10-11 Operation Screen Example: GPSMAP Fixed Mount* Main Menu...12 Screen Example: GPSMAP Fixed Mount* Input/Output Page...12 Reference Figure 4: The DGPS System...13... -
Page 7: Overview
GBR 21 and connect it to your GARMIN GPS unit. In addition to supplying power to the GBR 21, the power/data cable is used to interface the GBR 21 to the GPS unit. The receiver may be powered by an external 10-18 VDC power source. -
Page 8: Installation
• Antenna mount (standard 1-inch, 14 threads per inch) • Hardware (to secure the GBR 21) • On/off switch (to control power to the GBR 21) It is recommended that the system be temporarily hooked up with the wiring and unit placement approximating the desired final installation. -
Page 9: Figure 2: Gbr 21 Cable Connections
When a suitable configuration is found, a permanent installation should be made. The GBR 21 may be mounted on any flat surface. Select the mounting location according to your preferences— either an out-of-the-way location (such as under the dash) or at an accessible location where the LED status light will be visible. -
Page 10: Mounting The Antenna
(earth) ground. Do not ground the coupler to the electrical system. If the coupler is not adequately grounded, the beacon signal may be too weak for the GBR 21 to provide reliable correction data. 1. Secure the antenna mount at the desired mounting location. -
Page 11: Connecting Gbr And Gps
Connecting the GBR 21 To Your GPS Unit The final step in installing the GBR 21 is to connect the receiver’ s DATA IN, DATA OUT and GROUND (Return) lines to your GPS unit. The GBR 21 is designed to transmit/receive data at 4800 or 9600 baud (bits per second). - Page 12 (6) RED/BLK: NOT USED JUMPER THESE TOGETHER FOR 9600 BAUD. LEAVE THESE UNCONNECTED FOR 4800 BAUD. UNITS WITH 4 PIN ROUND PLUG Figure 3: Sample Wiring to GARMIN GPS Units 10-18 VDC (1) RED: POWER INPUT (1) RED: 10-18 VDC (2) BLACK: GROUND...
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Page 13: Operation
GPS unit with the GBR 21, refer to the owner’ s manual for your GPS unit. 1. Turn the power on to the GBR 21. The LED status light will flash indicating power has been applied, but no beacon signal is being received. - Page 14 5. Once the frequency and bit rate have been en- tered, “Tuning” will be displayed at the bottom of the page. 6. If the beacon signal is received by the GBR 21, the “SNR” field will display a signal-to-noise ratio and “Receiving” will appear at the bottom of the page.
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Page 15: Reference
STATION AND DGPS TRANSMITTER Figure 4: The DGPS System A DGPS system consists of the following: • DGPS Beacon Transmitter and GPS Receiver at a known location • Shipboard DGPS Beacon Receiver • Shipboard GPS Receiver (DGPS capable) • GPS Satellites After entering the beacon’s... -
Page 16: Figure 5: Shipboard Dgps System
These corrections are communicated to the users GPS set through the DGPS Beacon Station and the GBR 21. The users GPS set then uses the corrections to remove errors from its measurements. Satellites received by the shipboard GPS receiver, but not by the GPS receiver at the beacon transmitter site, will not have corresponding corrections. -
Page 17: Sources Of Error
Several conditions can cause a loss of the beacon signal: • Poor data or ground connections between receiver and the GPS receiver can result in intermittent or nonexistent correction data. • The range of a DGPS beacon transmitter (see the accompanying Beacon Reference Card) is typically a few hundred miles, or less. - Page 18 Sources of Error Multipath— Multipath error occurs when the GPS signal is reflected before it reaches the GPS receiver. The reflected signal takes slightly longer to reach the GPS receiver than a non-reflected signal. This added time delay results in position error. (The distance to each satellite is calculated based upon the time it takes the GPS signal to reach the GPS receiver.) Multipath error can be minimized...
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Page 19: Troubleshooting Chart
Wrong bit rate selected on GPS unit. Wrong frequency selected on GPS unit. GBR 21 not wired properly with GPS unit. Check wiring. Also refer to Troubleshooting problems 6 and 7. Not enough data is available to compute a DGPS position. -
Page 20: Troubleshooting Chart
Antenna coupler not securely Signal” grounded. Check ground strap. Beacon transmitter not transmitting correction data. GBR 21 not wired properly with 7) GPS interface GPS unit. Check wiring. status screen displays “None”, “No Status” No power to GBR 21. See or “Check Wiring”... -
Page 21: Gbr 21 Specifications
$PSLIB (Starlink) Output: RS-232 4800 or 9600 baud (jumper selectable) Output Sentence: RTCM SC-104 (6 of 8 bit format) Antenna Coupler Diameter: 1.6” (41mm) base, .6” (15mm) top Height: 4.8” (122mm) without antenna 16.8” (427mm) with antenna Reference GBR 21 Specifications... -
Page 22: Index
Reference Index Antenna...5, 7 Antenna coupler...5, 8 Antenna mount...6, 8 Baud rate...9 Beacon Log Page...12 Beacon Range...15 Beacon Receiver...13-14 Beacon Receiver Setup Page...11-12 Beacon Station...14-15 Beacon Transmitter...13-14 Capabilities...5 Cautions...2 Compatibility...5 Connections, Wiring...9-11 Contents, Package...5 DGPS System...13-14 Error, Sources of...15-16 Frequencies...12, 14 Ground strap...8 Installation, Antenna...8 Installation, Receiver...6-7... -
Page 23: Mounting Template
Reference NOTES: Maximum Hole Diameter = 0.145" (3.68mm) Select fastener type/length per your installation. 3.359" (85.30mm) Template Mounting Template... - Page 24 © 1993-2000 GARMIN Corporation GARMIN International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U.S.A. GARMIN (Europe) Ltd. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K. GARMIN (Asia) Corporation No. 68, Jangshu 2nd Rd., Shijr, Taipei County, Taiwan www.garmin.com...