MFJ-1270C/1274C MANUAL APPENDIX B: CALIBRATION
Page 240
Calset Values for Various Modulator Tone frequencies
Tone CALSET # Adjust Modem / Remarks
2125 247 R106 HF Packet
Fc = 2210 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
2100 250 R77 well on VHF FM too.
1200 438 R78 Packet / 1000 Hz shift standard.
Too wide to fit comfortably
through SSB filters for linear
2200 240 R77 mode 1200 baud use
2125 248 R106 Fc = 2550 Hz
2975 177 R105 850 Hz shift
2178 242 R106 Fc = 2220 Hz
2263 233 R105 85 Hz shift.
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