User's Manual

20 Calibrating the Exciter MB8100-90-00-806 © TEL 2004
Calibrating the FCL Modulation
This is step two of calibrating the exciter. Once you have auto-tuned the FCL,
you should calibrate the FCL modulation.
Equipment ■ Tuning tool
■ Calibration test unit (CTU)
■ Modulation meter
■ RF attenuator (only required if you are using a PA)
Setup
To calibrate the FCL modulation
1. Ensure you are already connected to the reciter.
2. Select the Reciter Calibration tab, and double-click FCL Calibration. The
FCL Calibration Wizard appears.
3. Attach an appropriate Load and Modulation meter to the PA or exciter
output, set the meter to measure the
RMS deviation, and then click Next.
(If you are using a PA, it will now transmit.)
4. Insert the tuning tool into the exciter VCO tuning hole and adjust the
trimmer to roughly center the exciter VCO on the band specified. Click
Next.
5. Use the slider to adjust the deviation at 30 Hz until it is 2121 Hz RMS (3 kHz
peak).
6. Select the 1 kHz Modulation Test and adjust the deviation at 1 kHz until it
is 2121 Hz
RMS (3 kHz peak).
7. Repeat steps 6 and 7 until the modulation is 2121 Hz RMS at both 30 Hz
and 1 kHz.
8. Click Finish. (If you are using a PA, it will now stop transmitting.)
When you have finished calibrating the FCL modulation, the icon on the
Reciter Calibration tab indicates that this task is complete.
You will now need to calibrate the VCO modulation.
1 Reciter 3 RF attenuator (only required if using a PA)
2 PA (optional) 4 Modulation meter
1 2
3
4