Epson Multi-mode Data Controller MFJ-1278B Benutzerhandbuch

The MFJ-1278B modem has five sets of pre-set modem components.  These modem 
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. 
 

OPERATION MODES 

P 

VHF Packet, 2 level FAX 

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) 

HIGH TONE(Hz) 

SHIFT(Hz) 

P 

1200 

2200 

1000 

H 

2125 

2295 

170 

2125 

2975 

850 

1275 

1445 

170 

C 

700 

  ---- 

 ---- 

M 

1100, 1200, 1300, 1500 and 

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.