Epson MFJ-1278B manual Modem Operation Modes, AMTOR, Navtex VHF RTTY, VHF Ascii

MFJ-1278B MULTI-MODE BASIC OPERATION

THE MFJ-1278B MULTI-MODE MODEM

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.

	MODEM		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
V		2125		2975	850
V*		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.