Tait TB8100 User Manual
Also see for TB8100: Installation and operation manualOperation manualUser manualInstallation guideUser manual
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Contents
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26 Calibrating the PA Power MB8100-90-00-806 © TEL 2003Calibrating the PA PowerImportant: Before you perform this procedure, you must calibratethe PA bias and the forward and reverse detector bias voltages.The PA power control loop is calibrated at a single frequency,generally in the center of the operating band. Factory calibration is performedat 460 MHz.You perform the calibration procedure to define—for each power level—thereference DAC (Digital-to-Analogue Converter) value and forward detectorvoltage.You should only need to re-calibrate the PA power if: The Low Pass Filter (LPF)/directional coupler PCB module is replaced Any repairs are carried out on the forward and reverse detector circuitry onthe Low Pass Filter/directional coupler PCB module You require a more accurate power calibration on a specific frequencyEquipment Either an inline power meter and 50 ohm load with a high power rating, or A terminating power meter and appropriate 50 ohm attenuator with a highpower ratingSetup for InlinePower MeterTo calibrate the PA transmit power1. Ensure you are already connected to the base station.2. Select the PA Calibration tab, and select Calibrate PA Power.3. Ensure that the power meter and a 50 ohm load (VSWR < 1.2:1) with ahigh power rating are connected to the power amplifier RF output, andthen click Next.4. Check that the PA RF input is connected to the reciter RF output, and thatthe PA and the reciter are connected by a control bus, and then click Next.5. For each power level shown, use the slider to adjust the DAC setting to getthe required power output, and then click Next Power to move to the nextline.Note: Click Coarse to roughly adjust the DAC setting, and onceyou get within range, click Fine for more precise control over thesettings. To move up or down one DAC value, click either side ofthe slider bar.1 32451 Reciter 3 PA 5 Load2 I2C control bus 4 RF Power Meter |
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