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ACNOVO GX900 User Manual
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Contents
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4.1.3 Measure antenna heightThe antenna height must be measured when we use GX900 to collect static data oruse it as base station. It’s the “a” show in below Figure 4-5, the height from groundmeasured point to phase center, only get this height can we know coordinate of theground measured point. There are 3 measuring methods to get the antenna height:(1) Slant heightMeasure the distance from the ground measured point to the middle of mainframescale mark. It’s the “d” shown in Figure 4-5.(2) Pole heightMeasure the distance from bottom of device to ground directly. It’s the vertical height“b” shown in Figure 4-5.(3) Measuring plateMeasure the distance ground measured point to the upper edge of plate. It’s the “c”shown in Figure 4-5.Choose either one measuring method from above. Use measure tape measure theheight you choose. Input the height in software. Then you can get the height fromground to phase center. The formula is as below:a=b+L1b=22 kc b=22 Rd －HFigure 4-5 (Measure Antenna Height)4.1.4 Transmit signal through external radioFix external enhanced antenna onto the tripod, and use connection cable to connectexternal radio with 5-pin port of receiver as shown in Figure 4-6. Plug power cable toexternal radio. Then turn on radio. You can set the channel on the external radio |
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