User manual TRIMBLE TRIMMARK3 RADIO MODEM 1.25 REV A

[. . . ] TRIMMARKTM 3 Radio Modem User Guide F Version 1. 25 Revision A Part Number 44104-10-ENG December 2004 Corporate Office Trimble Navigation Limited Geomatics and Engineering Division 5475 Kellenburger Road Dayton, Ohio 45424-1099 USA 800-538-7800 (toll free in USA) +1-937-245-5600 Phone +1-937-233-9004 Fax www. trimble. com refund the purchase price paid by you for any such Nonconforming Product, upon your return of any Nonconforming Product to Trimble in accordance with Trimble's standard return material authorization procedures. Warranty Exclusions and Disclaimer These warranties shall be applied only in the event and to the extent that (i) the Products and Software are properly and correctly installed, configured, interfaced, maintained, stored, and operated in accordance with Trimble's relevant operator's manual and specifications, and; (ii) the Products and Software are not modified or misused. The preceding warranties shall not apply to, and Trimble shall not be responsible for defects or performance problems resulting from (i) the combination or utilization of the Product or Software with hardware or software products, information, data, systems, interfaces or devices not made, supplied or specified by Trimble; (ii) the operation of the Product or Software under any specification other than, or in addition to, Trimble's standard specifications for its products; (iii) the unauthorized, installation, modification, or use of the Product or Software; (iv) damage caused by accident, lightning or other electrical discharge, fresh or salt water immersion or spray; or (v) normal wear and tear on consumable parts (e. g. , batteries). Trimble does not warrant or guarantee the results obtained through the use of the Product. [. . . ] Always monitor any frequency before and during operation. Also, to avoid possible interference with GPS reception, keep the base radio modem antenna as far as possible from the GPS antenna. Trimble recommends a minimum of 3 meters (10 feet). For precautions when using certain frequencies that can interfere with GPS operation, see Appendix 6, Using Radio Communication Systems with GPS Surveying Receivers, which is a copy of the Trimble publication 1­612­0082­2/94, Using Radio Communication Systems with GPS Surveying Receivers. 22 TRIMMARK 3 Radio Modem User Guide Operation 31. 1 3 TRIMMARK 3 base or repeater You can install the TRIMMARK 3 in a network as a base station or as a repeater. Typically, the base is configured for 25 Watts output, and the repeater is configured at 2 or 10 Watts output power. If necessary, reconfigure the unit's serial port settings to those of the GPS receiver. Configure the unit as a base with no repeaters, or with one or two repeaters. Ensure that all units in your network are configured according to their specific task within the network. Attach the base antenna onto the mounting pole. Mount the entire antenna assembly on a tripod using the tripod mounting plate and connect the antenna cable to the TRIMMARK 3 radio modem. Attach the antenna cable to the ANTENNA port on the unit. c. 3. Connect the power cable from the TRIMMARK 3 POWER port to an appropriate 12 volt DC power source. C WARNING ­ Make sure that you connect the power cable with the correct polarity. Reversing polarity does not damage the base radio modem, however the protective 10 Amp fuse in the power cable will blow. 4. Connect the 8-meter (25-foot) data cable from the base radio modem DATA port to the GPS receiver data port. For Trimble 4700, 4800, or 5700 GPS receivers, this is Port 3 If the GPS receiver is outputting data, the base should now be in operation. Check the display on the TRIMMARK 3 and make sure that the TRAN (transmitting) message is flashing. 5. TRIMMARK 3 Radio Modem User Guide 23 3 Operation 6. If the TRIMMARK 3 displays BUSY, another radio transmission is present on the frequency you selected. Change frequencies until you locate a clear channel. Make sure that you are on the correct channel, and power output. 7. Installing the TRIMMARK 3 as a repeater To achieve coverage to all points in a survey area, a TRIMMARK 3 network can include up to two repeaters. The repeaters retransmit data packets in a way that avoids mutual interference with the base and each other. The operation of the repeaters is transparent to the rovers. The rover will use the data packets from the base or repeater, whichever it receives first. The option to include a repeater in a TRIMMARK 3 network depends on the selected wireless data rate and the broadcast information content and rate (that is, CMR vs. Table 3. 2 shows when a repeater can be used in a network for various wireless data rates, RTK formats, and RTK epoch rates. Table 3. 2 Repeater use in networks DGPS 1 2 2 CMR at 1 Hz 1 2 2 CMR at 5 Hz 0 1 1 RTCM 2. x at 1 Hz 0 1 2 Wireless Data Rate (bps) 4800 9600 19200 2 = Two repeaters can be used 1 = One repeater can be used 0 = No repeaters can be used 24 TRIMMARK 3 Radio Modem User Guide Operation 3 To install a TRIMMARK 3 as a repeater: 1. [. . . ] Therefore, most of the effects of non-GPS signals can be minimized by physically separating your radio and GPS equipment. 46 TRIMMARK 3 Radio Modem User Guide Using Radio Communication Systems with GPS Surveying Receivers 6 6. 6 Useful Field Procedures There are a few useful field procedures that you can follow to minimize the effects of your radio. Since most of the radio signal in the GPS band is emitted directly from the radio transmitter box and received via the GPS antenna, make sure the GPS antenna is separated from the radio transmitter by 2­3 meters (7­10 feet). If you are still experiencing difficulties at this distance the GPS signal may be getting over-powered by the radio transmissions. In this case, you can either separate the equipment even more or shield the radio transmitter. [. . . ]