Changing Pre-emphasis
Of Optimod Fm 8100A/1

9/1/2007

The Optimod Fm Model 8100A/1 is normally configured with 75ms pre-emphasis. If your country’s standard is 50ms and you therefore wish to change the pre-emphasis on your unit from 75ms to 50ms, you must replace resistors and capacitors on card #6, as indicated on the following table.
Refer to Appendix J for location of components.

If you have not had much experience reworking double-sided printed circuits boards, see Replacement of Components on PC Boards in Appendix F. Verify correct operation when the modification has been completed, see Appendix D for a suggested method of verification.