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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION
Calset Values for Various Modulator Tone Frequencies
Tone CALSET # Adjust Modem / Remarks
2125 247 R106 HF Packet & RTTY
Fc = 2200 Hz
2295 229 R105 170 Hz shift
1300 404 R78 Packet / Fc = 1700 Hz, 800 Hz shift. CCITT V.23 std.,
preferable for HF 1200 baud, works well on VHF FM too.
2100 250 R77
1200 438 R78 Packet / 1000 Hz shift standard. Too wide to fit comfortably
through SSB filters for linear mode 1200 baud use
2200 240 R77
2125 248 R122 VHF RTTY
Fc = 2550 Hz
2975 177 R119 850 Hz shift
750 701 R139 CW
775 678 R139 CW
800 657 R139 CW
825 637 R139 CW
700 751 R139 CW / SSTV
1500 351 R138 SSTV
2178 242 R122 HF RTTY/ASCII/AMTOR Fc = 2220 Hz
2263 233 R119 850 Hz shift.
1275 412 R122 Low Tone RTTY (European Standard); 170Hz shift
1445 364 R119 Fc = 1360Hz.