Tait TB8100 User Manual

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Tait TB8100 User Manual Manual pdf 21 page image

TB8100 Calibration Kit User’s Manual Calibrating the RSSI 19SetupTo calibrate the VCO modulation1. Ensure you are already connected to the reciter.2. Select the Reciter Calibration tab, and double-click VCO Calibration.3. Attach an appropriate Load and Modulation meter to the PA or exciteroutput, set the meter to measure the RMS deviation, and then click Next.(If you are using a PA, it will now transmit.)4. Using the scale in the dialog box to help you, adjust the exciter lock bandtrimmer to center the exciter VCO on the sub-band indicated and thenclick Next.5. For each of the seven frequencies shown, adjust the slider until the deviationshown on the modulation meter is 2121 Hz RMS . When you have finished,click Next Band.6. For each sub-band repeat steps 4 and 5.7. Click Finish. (If you are using a PA, it will now stop transmitting.)When you have finished calibrating the VCO modulation, the icon on theReciter Calibration tab indicates that this task is complete.You should now adjust the exciter lock band because it was re-tuned severaltimes during this procedure. This means that the exciter is no longer on therequired frequency.Calibrating the RSSICalibrating the RSSI (received signal strength indicator) ensures that thereciter's internal RSSI values accurately reflect the actual received signalstrength. Changing the receiver's lock band can alter the calibration accuracy byabout 1 dB.Note: Ensure that the receiver’s lock band has already been adjustedto the required setting before carrying out this procedure. (See“Adjusting the Receiver Lock Band” on page 13.)Equipment RF signal source1 Reciter 3 RF attenuator (only required if using a PA)2 PA (optional) 4 Modulation meter1 234