MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION
NOTE: If you have a square wave on the scope face but the tuning indicator is not near
center, you are on a false setting. Adjust R115 so that the tuning indicator is near
center and THEN set the square wave duty cycle.
4. If MCW transceive operation with another station is desired, do the above procedure to
BOTH MFJ-1278s using an agreed upon frequency for Fc. Then leave the modulator
tone on the agreed on frequency with the demodulator Fc.
5. Remove jumpers placed at JMP 4 and JMP 7.
6. Remove the jmuper at JMP9 pins 1 and 2. Place it on JMP9 pins 2 and 3.
7. Remove the two jumpers from JMP16 pins 1 and 2 and pins 3 and 4. Place these
jumpers on JMP16 pins 1 and 3 and pins 2 and 4. The jumpers on JMP16 will now be
positioned horizontally, if the leds on the MFJ-1278 are facing you.
This completes the CW modem alignment procedure.
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