TEX150
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User Manual
Rev. 4.0 - 27/07/01
10. Calibration Procedure
10.1 Internal Adjustment
Please note that this kind of operations should only be done by skilled technical
people. Remember that this operation is not normally needed. Opening the device
may void you’re warranty.
10.1.1 Stereo coder adjustment
It will be necessary to check and recalibrate the following parameters after
replacement of the Stereo Encoder card (see the setup below):
figure 10.1
•
Select 0dBm on the INPUT LEVEL selector (encoder and pilot tone inserted).
• Connect a low distortion, sine-wave, audio generator to the left and right inputs.
• Connect a 50 Ohm 300 W load to the RF output of the TEX150.
• Connect the -40dB tap to the F.A.M. (or other modulation analyzer).
• Connect a stereo MEAS-decoder to the rear FM-MPX output of the F.A.M.
• Switch on the TEX150 and wait for the PLL to lock.
• Adjust the audio output of the generator to 0dBm (2.2Vpp = 775mVRMS 400Hz).
• Select, with the appropriate control, a reading of Right (MONO) and adjust P8
on the encoder to obtain 0dB.
• Repeat the operation for Left (MPX), adjusting P7.
• With the FAM in FM, P+ mode, and with a 30Hz-200KHz audio filter, check that
the deviation is 75KHz. If not, adjust trimmer R35, situated on the Main card,
accordingly.
• Remove the audio signal from both channels, leaving the pilot tone inserted,and
check that the deviation is between 6.5KHz and 8KHz (typically 7.5KHz). Adjust
P6 if necessary.
•
Remove the audio signal from one channel.
NOTE:
Check that the generator output is still at 0db.
Summary of Contents for TEX150
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Page 51: ...TEX150 CSALMTEX100 1 4 Technical Appendix Rev 1 0 27 07 01 ...
Page 55: ...TEX150 CSFIN150W03 1 4 Technical Appendix Rev 1 0 27 07 01 ...
Page 59: ...TEX150 PSSW2812B 1 4 Technical Appendix Rev 1 0 27 07 01 ...
Page 63: ...TEX150 CSAUDIOCTE 1 4 Technical Appendix Rev 1 0 27 07 01 ...
Page 67: ...TEX150 CSSDC30A003 1 6 Technical Appendix Rev 1 0 27 07 01 ...
Page 73: ...TEX150 CSAFM MPX002 1 4 Technical Appendix Rev 1 0 27 07 01 ...
Page 74: ...TEX150 2 4 CSAFM MPX002 Technical Appendix Rev 1 0 27 07 01 ...
Page 77: ...TEX150 CSSINTEX100 1 4 Technical Appendix Rev 1 0 27 07 01 ...
Page 81: ...TEX150 CSTCXO02 1 4 Technical Appendix Rev 1 0 27 07 01 ...
Page 85: ...TEX150 SLWSTDTEX100 1 4 Technical Appendix Rev 1 0 27 07 01 ...
Page 89: ...TEX150 CSLPF3TEX100 1 4 Technical Appendix Rev 1 0 27 07 01 ...
Page 93: ...TEX150 CSVCODRVTX02 1 4 Technical Appendix Rev 1 1 24 12 02 ...
Page 97: ...TEX150 METER100 3 1 4 Technical Appendix Rev 1 1 09 10 01 ...
Page 101: ...TEX150 CSCONTRAVES 1 6 Technical Appendix Rev 1 0 27 07 01 ...
Page 104: ...TEX150 4 6 CSCONTRAVES Technical Appendix Rev 1 0 27 07 01 ...
Page 107: ...TEX150 CSP100 1 4 Technical Appendix Rev 1 0 27 07 01 ...