Tait TB8100 User Manual

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Tait TB8100 User Manual Manual pdf 16 page image

14 Tuning the Receiver MB8100-90-00-806 © TEL 2003Tuning the ReceiverThe second step in tuning the reciter frequency is to tune the receiver frontend. Tuning the receiver flattens the receiver’s response across its lock band(switching range).To help you do this, there is a graph of the RSSI readings in step two of theTune Receiver Front End Wizard. A number of RSSI readings are measuredacross the 10 MHz band. These readings are then continually averaged toproduce the graph.You should aim to achieve a response that looks something like this:Equipment Tuning tool Calibration test unit (CTU)SetupTo tune the receiver1. Ensure you are already connected to the reciter.2. Select the Frequency Setup tab, and double-click Tune Receiver FrontEnd. The Tune Receiver Front End Wizard appears.3. Connect the CTU’s noise source to the receiver input, turn the noise sourceon, and then click Next.4. For each set of front-end helical filters, insert the tuning tool into eachtuning hole. (For the tuning sequence, refer to “Holes for Tuning theReceiver Front-End” on page 8.) Click Coarse (fast) and roughly adjustthe front-end helical filters on the receiver. As you do so, observe thegraphical RSSI readings across the lock band.Note: As the response gets flatter, you may find it helpful to select amore sensitive scale, so that you can see the graphical reading inmore detail.5. Once you have roughly tuned the front-end helical filters, click Fine(slow). Continue to fine tune the front-end helical filters until the responseis flat in the middle of the lock band and not more than -1 dB at the endsof the band (± 5 MHz).3211 CTU 2 Noise source 3 Reciter