GBR 21 beacon receiver © 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 Part Number 190-00069-00 Rev.
© 1993-2000 GARMIN Corporation GARMIN International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U.S.A. Tel. 913/397.8200 or 800/800.1020 Fax 913/397.8282 GARMIN (Europe) Ltd. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K. Tel. 44/1794.519944 Fax 44/1794.519222 GARMIN (Asia) Corporation No. 68, Jangshu 2nd Rd., Shijr, Taipei County, Taiwan Tel. 886/02.2642.8999 Fax 886/02.2642.9099 All rights reserved.
Introduction Limited Warranty GARMIN Corporation warrants this product to be free from defects in materials and workmanship for one year from the date of purchase. GARMIN will, at its sole option, repair or replace any components which fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or labor. The customer is, however, responsible for any transportation costs.
Introduction Cautions All differential beacon receivers decode correction data determined at the beacon transmitter site via a GPS receiver(s). The GPS system is operated by the government of the United States which is solely responsible for their accuracy and maintenance. The DGPS beacon transmitters are operated by the U.S. Coast Guard (or similar government agency in other countries) which is responsible for their accuracy and maintenance.
Introduction Table of Contents Introduction Limited Warranty........................................................1 Cautions .....................................................................2 Table of Contents .......................................................3 List of Figures ............................................................4 Overview Capabilities & Package Contents................................5 Installation Mounting the Receiver ............................................
Introduction List of Figures Installation Figure 1: Mounting the Receiver............................................page 6 Figure 2: GBR 21 Cable Connections............................................7 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....
Overview Capabilities The GBR 21 offers a host of powerful capabilities to enhance the performance and accuracy of your GARMIN GPS receiver: • Performance— Single channel operation provides high-sensitivity manual tuning throughout the beacon broadcast band. • Ease of Use— Operation is controlled using the Beacon Receiver Setup and Beacon Log pages on your GPS unit. • Convenience— May be remotely mounted in an out-of-the-way location. Receiver status information is displayed directly on the GPS unit.
Installation Mounting the Receiver Mounting the Receiver Please read through these instructions thoroughly before attempting installation. Make sure you completely understand these instructions before you begin. When in doubt, seek professional assistance. The receiver may be mounted at a remote location, under the dash or behind a panel. However, you may wish to mount the receiver at a location that allows easy viewing of the LED status light for immediate indication of receiver status.
Installation If a problem is found, try altering the location of the unit or wiring. Often moving the antenna a few feet away from the source of interference will solve the problem. 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.
Installation Mounting the Antenna Mounting the Antenna The Interface Setup Page may be selected from the Main Menu on the GPS 12/ 12XL/48. For additional instructions, see the owner’s manual for your GPS receiver. The supplied antenna coupler fits a standard 1-inch antenna mount (not included). Like the receiver, the antenna should be placed away from all sources of interference.
Installation 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). The receiver defaults to 4800 baud, which is suitable for use with all GARMIN GPS receivers. The 9600 baud option is provided to allow the receiver to be used with some newer models and other manufacturer’s GPS units.
Installation Connecting GBR and GPS UNITS WITH 7 PIN PLUG 4 3 10-18 VDC GBR 21 (1) RED: POWER INPUT (1) RED: 10-18 VDC (2) BLACK: GROUND (2) BLACK: GROUND (3) BLUE: DATA OUT (3) BLUE: DATA OUT 5 (4) BROWN: DATA IN (4) BROWN: DATA IN 2 6 1 7 (5) WHITE: NOT USED (5) WHITE: BAUD SELECT IN (6) GREEN: NOT USED (7) YELLOW: ALARM (6) GREEN: BAUD SELECT OUT (7) YELLOW : GROUND JUMPER THESE TOGETHER FOR 9600 BAUD. LEAVE THESE UNCONNECTED FOR 4800 BAUD.
Operation Using the GBR 21 UNITS WITH 18 PIN PLUG 2 1 3 6 10-18 VDC GBR 21 (15) RED: POWER INPUT (1) RED: 10-18 VDC (18) BLACK: GROUND (2) BLACK: GROUND (17) BLUE: DATA OUT (3) BLUE: DATA OUT (4) BROWN: DATA IN (16) BROWN: DATA IN 11 7 (11) YELLOW: ALARM (5) WHITE: BAUD SELECT IN 15 12 (1-10,12-14) NOT USED (6) GREEN: BAUD SELECT OUT 18 (7) YELLOW : GROUND 16 JUMPER THESE TOGETHER FOR 9600 BAUD. LEAVE THESE UNCONNECTED FOR 4800 BAUD.
Operation Using the GBR 21 autopilot or plotter, are connected to the GPS unit, they must be set to work with NMEA 0183 as well. (Note: On some newer model Garmin GPS receivers, you may set the interface to “Garmin Bcn Rcvr”. There is also a scan option which will automatically scan for a DGPS frequency and bit rate. Please refer to your GPS owner’s manual for using this function. If this setting is used, you may skip step 4.) 4.
Reference automatically default to the last beacon transmitter used each time the GPS unit is turned on.) 9. Select the Satellite Bar Graph Page. A “D” will appear at the bottom of the signal strength bar for each satellite with a corresponding differential correction or “3D Differential” will be displayed at the top of the satellite page. This page is useful for determining the quality of differential coverage available.
Reference DGPS: How It Works The Main Menu Page on the GPS III/III+/12Map/ Navtalk. Select ‘Setup’ to make the desired interface settings. The DGPS Beacon Transmitter is placed at a known location (i.e., the exact position of the site has been previously determined). At the beacon transmitter site, the GPS satellites are monitored using a GPS receiver. This receiver is equipped to calculate corrections for each satellite received.
Reference Individual stations vary and the user may wish to verify the suitability of the signal for the intended application with the station operator. The station power is normally set to provide a usable range somewhere near 300 km. Other factors such as local interference, lightning, time of day and season, and if the path to the station is over ground or water, and antenna selection or installation affect the usable signal range.
Reference Sources of Error 16 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.
Reference Problem Possible Cause 1) Receiver will not power on (No LED) Power switch/wiring faulty. Fuse/breaker blown (if used). 2) LED status light flashing RTCM data not being received from broadcast site. 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. 3) “No DGPS Position” Not enough data is available to displayed on GPS unit compute a DGPS position.
Reference Troubleshooting Chart If the ‘No Differential GPS Position’ message is displayed on your GPS receiver, correction data may not be available. This may be due to a missing or weak beacon signal, not enough GPS satellites or bad wiring connection between the GBR 21 and GPS. Problem 6) GPS interface status screen displays “No data” or “No Signal” Wrong frequency or bit rate selected on GPS unit. Antenna coupler not securely grounded. Check ground strap.
Reference Physical Size: 5.2”L x 3.6”W x 1.5”H (132mm x 91mm x 38mm) Weight: 6.8 ounces (0.193 kg) GBR 21 Specifications Power Voltage: 10 - 18 volts DC using supplied power/data cable Current Drain: 130 mA Signal Processing Frequency Range: 283.5 - 325.
Reference Index A Antenna.............................................5, 7 Antenna coupler.................................5, 8 Antenna mount..................................6, 8 B 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.
Reference Template Mounting Template NOTES: Select fastener type/length per your installation. 4.752" (120.70mm) Maximum Hole Diameter = 0.145" (3.68mm) 3.359" (85.
GBR 21 beacon receiver © 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 Part Number 190-00069-00 Rev.
