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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION
15. Press the SPACE BAR, the MFJ-1278B will display:
Multilevel demod: 307 {154}KHz.
1550 Hz: 106 {53}
At this time there will be some numbers scrolling on the computer screen. The numbers on
the screen will vary from 103 to 110.
16. Press the SPACE BAR, the MFJ-1278B will display:
2250 Hz: 70 {35}
NOTE: This may take a few seconds to appear due to the sampling rate of the MFJ-1278B.
The numbers on the screen again will vary from 65 to 75.
17. Press the SPACE BAR, the MFJ-1278B will respond:
DEMODULATOR ALIGNMENT
Tune R113 until STA & CON LEDS ALTERNATE;
then tune R212 until 10th LED from the LEFT is lit..
18. Adjust R113 until the STA & CON LEDS alternate back and forth. This means
neither one should stay ON all of the time.
19. Then adjust R212 until the 10th LED from the LEFT on the tuning indicator is lit.
20. Press the SPACE BAR. The MFJ-1278B will respond:
Tune trimpot indicated until the 10th LED from the LEFT is lit.
R115
21. Adjust R115 until the 10th LED from LEFT on the tuning indicator is lit.
22. Press the SPACE BAR, the MFJ-1278B will respond:
R79
23. Adjust R79 until the 10th LED from the LEFT on the tuning indicator is lit.
24. Press the SPACE BAR, the MFJ-1278B will respond:
Tune R114 until the 6th LED from the LEFT is lit..