User's Manual

14 Calibrating the Exciter © Tait Electronics Limited 2005
Calibrating the Reciter
The reciter is fully calibrated in the factory, but if the reciter is serviced you may
need to perform the following procedures:
■ Calibrating the Exciter
■ Calibrating the RSSI
■ Audio Calibration
To compensate for frequency drift, you may need to perform the following:
■ Carrier Frequency Offset Adjustment (Older Reciters) or
■ Carrier Frequency Offset Adjustment (Newer Reciters)
All these procedures can be done independently of each other, although it is
recommended that you tune the receiver before you calibrate the RSSI.
Important: It is recommended that only accredited service centers
and Tait engineers perform these procedures.
Calibrating the Exciter
You will need to calibrate the exciter if you have made component-level repairs
to it. There are three procedures that must all be completed in order:
1. Auto-tune the FCL
2. Calibrate the FCL
3. Calibrate the VCO
Automatically Tune the Frequency Control Loop (FCL)
Tuning the FCL calibrates the voltage levels used in the detectors for the FCL.
To automatically tune the FCL
1. Connect the Calibration Kit PC to the reciter and start the Calibration Kit.
2. Select the Reciter Calibration tab, and double-click FCL Auto Tuning.
The FCL Auto Tuning Wizard appears.
3. Click Calibrate to automatically tune the FCL.
The icon on the Reciter Calibration tab indicates that this task is complete.
You will now need to calibrate the FCL.
Calibrating the FCL
This is step two of calibrating the exciter. Once you have auto-tuned the FCL,
you should calibrate it.
Equipment ■ Tuning tool
■ CTU
■ Modulation meter
■ RF attenuator (only required if you are using a PA)