The Mfj-1278B Multi-Mode Modem - MFJ Multi-mode Data Controller -1278B User Manual

MFJ-1278B MULTI-MODE

THE MFJ-1278B MULTI-MODE MODEM

The MFJ-1278B modem has five sets of pre-set modem components.
components allow the MFJ-1278B to operate efficiently in its various modes of operation.
These modes of operation include VHF and HF Packet, PACTOR, AMTOR, VHF RTTY,
HF RTTY, VHF ASCII, HF ASCII, CW, Modulated CW, CW Memory Keyer, 16 gray level
FAX (including Weather FAX), color SSTV and monitoring of NAVTEX.
All modem components have been individually calibrated for each mode of operation. The
MFJ-1278B has been factory calibrated and does not require re-calibration when operating
any the operational modes.
The modes used with each modem are shown in Table 4-1. The tones and shifts produced by
each modem are shown in Table 4-2.
MODEM OPERATION MODES
VHF Packet, 2 level FAX
P
H HF Packet, HF Baudot RTTY, HF ASCII, PACTOR,
AMTOR, NAVTEX
V VHF RTTY, VHF ASCII
C CW, Memory Keyer, Modulated CW
M Multi-level FAX, Color SSTV
Table 4-1: MFJ-1278B Modem and Operation Modes
MODEM LOW TONE(Hz)
1200
P
2125
H
2125
V
1275
V*
700
C
1100, 1200, 1300, 1500 and
M
1550 thru 2250 in 50-Hz steps
Table 4-2: Tones & Shifts Produced by the MFJ-1278B Modems.
* The MFJ-1278B will transmit and receive these tones when shorting jumpers for JMP E, F,
G, and H are removed on the mother board.
BASIC OPERATION
These modem
HIGH TONE(Hz) SHIFT(Hz)
2200 1000
2295 170
2975 850
1445 170
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