Tait TM8100 User Manual

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Contents

Tait TM8100 User Manual Manual pdf 14 page image

14 Calibration tests TM8100 Mobile Radio Calibration Application User’s ManualAugust 2004 © Tait Electronics Limitedis greater than –70dBm approximately. The calibration test is run at-68dBm, -60dBm and -50dBm for standard TM8000 radios, and -62dBm,-54dBm and -44dBm for TM8000 trigger base radios.MuteThe Mute test will calibrate the radio’s squelch (carrier) mute, at an RFinput level resulting in an audio measurement of 12 dB SINAD. Thecalibration application will take an average of 35 noise measurements, todetermine accurate opening and points for Country, City, and Hard.Note Closing points are also calculated from this test.Final Gate Bias and Tx Driver Bias LimitThe final transistor in the radio must be biased at a constant current. Eachtransistor is different and so requires a different voltage to obtain the samecurrent.The Final Gate Bias 1 test must be completed first before the Final Gate Bias2 test.Important Jumping to a high DAC setting (the slider will change tored) can cause overheating and component damage. Youcan only force a slider into this danger zone with a deliber-ate action. See Sliders for more information.It should not be necessary to change these settings, unless there are specificrequirements.Tx Power ControlPower control must be calibrated for high, mid and low and very low powerat five points across the radio’s frequency band to ensure a flat power outputacross the operating band.The Power Control test requires a total of 20 adjustments, four at each testfrequency.