User's Manual

TB8100 Calibration Kit User’s Manual Calibrating the Exciter 19
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
■ Calibrating the TCXO
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.
Advanced
Troubleshooting
All the commands sent and received by TB8100 Calibration Kit are saved in a
file called “CCTM.log”. The date, time, command number, and parameters are
all stored in this file, which may be helpful when troubleshooting.
The file is saved in the Logfiles folder (..\Program Files\Tait Programming
Applications\TB8100 Service Kit\LogFiles), and stores up to 1000 of the most
recent logged items.
Calibrating the Exciter
You will need to calibrate the exciter if you have made component-level repairs
to it. There are three steps:
1. Auto-tune the FCL
2. Calibrate the FCL modulation
3. Calibrate the VCO modulation
Automatically Tune the Frequency Control Loop (FCL)
This is step one of calibrating the exciter.
Low frequencies (CTCSS and DCS) are modulated using the FCL (frequency
control loop). The FCL forms a loop that allows the reference frequency to be
modulated.
To automatically tune the FCL
1. Ensure you are already connected to the reciter.
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 modulation.