Tait TB9100 User Manual

Also see for P25 CG: Installation and operation manual Installation and operation manual

Tait TB9100 User Manual Manual pdf 14 page image

8 Adjusting the Frequency Setup © Tait Electronics Limited February 2007Adjusting the Frequency SetupBefore the TB9100 base station is installed, connected, and configured, youmust prepare it for operation by adjusting the switching range of the receiver,optimizing the receiver response across the switching range, and adjusting theexciter lock band or selecting an exciter sub-band.Note: If the required switching range for the base station has alreadybeen defined, you don’t need to perform these procedures.Tip: Use the TB9100 CSS to monitor the base station and find outits current switching range.Important: Be careful when using the tuning tool. Applying toomuch pressure or attempting to turn the tool beyond the end of therange can crack the tuning slug. Unscrewing a slug too far canremove it completely.Adjusting the Receiver Lock BandThe first step in preparing the TB9100 base station for operation is to adjust thereceiver lock band (switching range). The lock band is the range of frequenciesthat the receiver is calibrated to operate on.To adjust the receiver lock band1. Set up the equipment and connect the Calibration Software to the reciter.2. Select the Frequency Setup tab, and double-click Set Receiver VCO. TheSet Receiver VCO Wizard appears. The display varies, depending on thereciter band.3. Enter the Center Frequency (which must be a multiple of 500 kHz) of thelock band that you want to use, and click Next.4. Insert the Murata tuning tool into the correct receiver VCO tuning hole forthe reciter type (see below) and then click Next.5. Adjust the receiver VCO trimmer until the actual band matches the desiredband. The bands turn green. Click Finish. This stores the lock band in thereciter. The icon on the Frequency Setup tab indicates that this task iscomplete. Proceed to tune the front end.