User's Manual

TB8100 Calibration Kit User’s Manual Adjusting the Exciter Lock Band 17
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 response
is flat in the middle of the lock band and not more than -1 dB at the ends
of the band (± 5 MHz).
Note: When using the Fine (slow) setting, you may notice a slight
delay as the reading from tuning the front-end helical filters takes
approximately one second to appear on the graph.
6. Click Finish.
Once you have finished tuning the receiver, the icon on the Frequency
Setup tab indicates that this task is complete.
Adjusting the Exciter Lock Band
If you are preparing the base station for operation, adjusting the exciter lock
band is the third step in tuning the reciter. Otherwise, this procedure can be
performed independently of the other two calibration wizards on the
Frequency Setup tab. Adjusting the exciter lock band defines the range of
frequencies that the base station is able to transmit on.
Note: When performing this procedure, you don’t need to
terminate the exciter output port. An internal output pad means that
there is a good impedance match at this interface.
Equipment ■ Tuning tool
■ Calibration test unit (CTU)
To calibrate the exciter lock band
1. Ensure you are already connected to the reciter.
2. Select the Frequency Setup tab, and double-click Set Exciter VCO. The
Set Exciter VCO Wizard appears.
3. Enter the center frequency (which must be a multiple of 500 kHz) of the
lock band that you want to use, and click Next.
4. Insert the tuning tool into the exciter VCO tuning hole and adjust the
trimmer to roughly center the exciter VCO on the band you want. Click
Finish.
Once you have finished adjusting the exciter lock band, the icon on the
Frequency Setup tab indicates that this task is complete.