Table of Contents
FSK Connection Getting Started
Connect
Slow Scan Television Operation
Navtex Operation
FAX Operation
Advanced Packet Operation
125
External Modem Interface Connector J14
MFJ-1278B Specifications
MULTI-LEVEL Interface CONNECTOR,J13
HF Tuning Indicator
Command Summary
CW Modem TUNE-UP Procedure
BPS Packet Setup
MFJ-1278B/1278BT Parts List
MFJ-1278B MULTI-MODE Table of Contents
MFJ-1278B MULTI-MODE Introduction
MFJ-1278B MULTI-MODE Introduction
Items supplied with MFJ-1278B/MFJ-1278BT package
MFJ-48BE
MFJ-1278B MULTI-MODE Computer Interfacing
MFJ Starter Packs
Serial port signals required by MFJ-1278B
Serial Port Signals
Pin Signal Name Description
Manufacturer Model
Macintosh MFJ-1278B Pin DB-25P DB-9P
Computer with Specific Serial Interfaces
Apple Macintosh
Hsko Hski
Commodore C64, C128 and VIC-20
IBM PCjr
IBM PC/XT/AT/386/486 and compatibles Computer
Radio Shack Color Computer
Color Computers
Color Computer DB-25P
Other Computers with Nonstandard Serial Ports
MFJ-1278B RS-232C Computer RS-232C
MacTerm Parameters for MFJ-1278B
Apple II, II+, IIe, IIc
Compatibility Terminal
IBM and Compatible Computers
Pin # Mnemonic Name
MFJ-1278B Serial Port PIN Functions
Radio Shack Model 100/102 and NEC
RS-232C Pin Designations
Computer Baud Rate
Autobaud
Changing Terminal Baud Rate
BbRAMLOAD with Defaults a
MFJ ENTERPRISES, INC. Model MFJ-1278B
Printer Port Connection
MFJ-1278B DB-25 Name Printer Port Pin #
Type Printtes CR
Printer Consideration
Printer Port Test
MFJ-1278B MULTI-MODE Radio Interfacing
MFJ-1278B Radio Ports
Radio Connector Pin Diagram
HT Special Keying Circuit
Calibra
Transmit Audio Level Adjustment for Method I Interface
Method 1 Direct Connection to Microphone and Speaker
Setting the Receiver Audio Input Level
Method 2 Accessory Jack or Interface Box Connection
Accessory Jack Interface
External Interface Box
Transmit Audio Level Adjustment for Interface Method
Receiver Audio Setting
Important Note Harmonics Interference
Page
Key Paddle Connection
MFJ-1278B MULTI-MODE Radio Interfacing CW Installation
Keying Connection
MFJ-1278B MULTI-MODE Radio Interfacing FSK Connection
FSK Cable
First Steps
Basic Commands
MFJ-1278B MULTI-MODE Basic Operation Getting Started
Mycall K5FLU
Serial Port Configuration
MFJ-1278B MULTI-MODE Basic Operation
Mycall was Nocall cmd
Parity 1 or Parity
Parity and Word Length
Echos
New Lines and Line Wrapping
Modem
Modem Operation Modes
AMTOR, Navtex VHF RTTY, VHF Ascii
LOW Tone Hz High Tone Hz Shift Hz
Verifying Operation Status
Mode Switching With the Mode Command
MFJ-1278B MULTI-MODE Basic Operation Operational Modes
Radio Port Switching
Memory Buffers
Buffer Serial Numbering
Loading the Memory Buffers
Transmitting the Memory Buffers
BUF1 The QTH here is Starkville, Mississippi. Enter
Buftime 15 Enter
Memory Repeat and Buffer Repeat Time
Chaining the Memory Buffers
Buftime to
MFJ-1278B MULTI-MODE Basic Operation Tuning Indicator
VHF Packet
Connecting and Disconnecting Exercise
MFJ-1278B MULTI-MODE Basic Operation Packet Operation
Cmd Fulldup on Cmd Connect K5FLU
Cmd Disconne
Disconnected
Cmd Connect N2WX VIA AD7I
Digipeating
AD7I
Cmd Connect N2WX VIA NK6K, KV7D
Retry count exceeded
Unsuccessful Connections
Monitoring Channel Activity
Disconnected
AD7I WA7GXD N2WX NK6K KV7B
WB6YMHWD0ETZ,KV7B
Mheard Enter
Cmd Connect WB0QRP
Your First Packet QSO
Starting the QSO
Connected to WB0QRP
Cmd Connect WB0QRP VIA K5FLU
CTRL-C
Cmd Connect K5FLU VIA WB0QRP
Special Input Characters
Cmd Command 5 was $03
Monitoring on the Air
Cmd Monitor on Cmd Mcon on Cmd Convers
Canline
Cmd Hi, John, how are you?CTRL-X\
Hi, John, how are you?
Redispla
Page
HF Packet Operation Hints
Pactor Operation
What is Pactor?
MFJ-1278B MULTI-MODE Basic Operation Pactor
Pactor
MFJ Pactor $2c-1022 free pcmd
Mode PT Enter
FEC Unproto operation
Mycall n Enter
Changeover
Monitoring
Txdelay TXD
Exiting Pactor Mode
Threshold Control Setting
Monitoring Amtor ARQ requests
Pactor Feature Definitions
Digital Memory ARQ
Connect
SPEEDup/SPEEDdown
Amtor Detection in Pactor
Pactor Status Indicators
Status Indicator
STA CON
Memory Size # of Slots Bytes Avail
Setting Up your Pactor Mailbox
MFJ-1278B MULTI-MODE Basic Operation Pactor Mailbox
MFJ Pactor $2c-1022 free
Mailbox on Enter
Mailbox Ready Free de callsign Help, K, L, R, S
General Overview
Sysop Enter
MFJ-1278B MULTI-MODE Basic Operation
Slot## t m To From Subject
Nn free de callsignHelp, K, L, R, S
Detailed Pactor Mailbox Overview
SP call
Enter Subject Max Characters
Send msg Control-Z or /EX on it own line ends
Enter
## Enter
Message ## deleted Nn free n Mailbox Help,K, L, R, S
Nn free n Mailbox Help, K, L, R, S
## Enter
?EH
Mailbox Messages
Pactor Enter
Procedure
MFJ-1278B MULTI-MODE Basic Operation CW Operation
Receiving CW
Enter
MSPeed 15 Enter
Mode CW,15 Enter
Transmitting CW
Transmitting from Memory Buffers
CW Weighting
Weight ### Enter
CONTROL-C
Tuning your Radio
Random Code Generator
Randomcw OFF Enter
Ctrl-R
Setting Up the for Code Practice
Randomcw on Enter
Ctrl-T
Sending CW with External Key Paddle
Mspeed 15 Enter
MFJ-1278B MULTI-MODE Basic Operation Modulated CW Operation
Mode MC Enter
Radio Terminal Mode Modulated CW Cmd
VHF Rtty
Setting Up for Ascii and Rtty Operation
Mode ## Enter
Rtty and Ascii Transmitting
Mode VB,110 Enter
Rtty and Ascii Receiving
Bad?
Mode HB,75
Baudot Rtty Operation Hints
Commercial Rtty Reception
CTRL-T
Baud, 90% Confidence baud used 7 bits, RXInvert Off
WtgCD
SpeedConfidence Factor.SpeedData BitsRXInvert On/Off
OK Enter
OK Amtor Enter
Mode HB,75 Enter
Configuring for Mars
Command Mars Setting
Mars Operation
MARsmode Command
Operating Mars with MultiCom for IBM
Marsmode 1- QSO Mode
Marsmode 3- Storage Mode
Mode AM Enter
Mode a ARQ
Setting up for Mode a Operations
MFJ-1278B MULTI-MODE Basic Operation Amtor Operation
=Q 2=W 3=E 4=R 5=T 6=Y 7=U 8=I 9=O 0=P
Operating Mode a
N2WX becomes Nwwx using zone
Setting up for Mode B FEC
Monitoring Mode A, ARQ
Mode B FEC
Mode B FEC Operations
Amtor Status LED Indicators
Myselcal xxxx Enter
ARQ xxxx Enter
Summary of Amtor Contact Sequence
Print on Enter
Navtex Operation
MFJ-1278B MULTI-MODE Basic Operation Navtex Operation
Navtex Stations and Frequencies
Station QTH Station ID Broadcast Time UTC
Navtex on Enter
Navtex OFF Enter
LORAN-C
Omega Systems Satnav Systems
MFJ-1278B MULTI-MODE Basic Operation FAX Operation
Faxmode n Enter
FAXMODEn Lines per Type of Service Minute Second
FAX Formats
Printer Connection
FAX Installation
FAX Frequency
Locations
Receiving FAX to the Printer
Mode FX Enter
Receiving FAX
MFJ-1278B MULTI-MODE Basic Operation
LF, CR, ESC x x, ESC x x x, nnn character of graphics
Display FAX Picture on Computer Screen & Save it to Disk
Two Level FAX Picture Format
Multi-level FAX Picture Raw Data Format
Multifax on Enter
000 001 110 111 White Lightest grey Darkest grey Black
Transmitting FAX
Two Level FAX Transmitting
Multi-level FAX Transmitting
MFJ-1278B MULTI-MODE Basic Operation
Values HEX
Creating FAX Pictures for Transmitting
Pixtones
FAX/SSTV Transmit Tones Hz
Page
Printer Connection
Sstv Installation
Sstv Formats
TVMODEn Formats
Sstv Printing to the Printer
Mode TV Enter
Receiving Sstv Pictures
Tvmode n Enter
MFJ-1278B MULTI-MODE Basic Operation
$ss,$aa,$bb,$cc,$dd,$ee,$ff,$gg,$hh,$ii,$jj,$kk,$ll,$mm,$nn
Printing Sstv Pictures to the Screen
Transmitting Sstv Pictures
Saving Sstv Pictures to Disk
Terminating Sstv Printing
Creating Sstv Pictures for Transmitting
MFJ-1278B MULTI-MODE Basic Operation
Special Characters
Packet Operating Modes
Command Mode
MFJ-1278B MULTI-MODE Advanced Operation
Dec Hex Control Mnemonic
Entering Data-Transfer Modes
Converse Mode
Connected to callsign
Transparent Mode
Flow Control
XON/XOFF Flow Control
Type-in Flow Control
Detailed VHF Packet Operation
Hardware Flow Control
Station Identification
Automatic Operations
W3IWI-3IDW3IWI/R
Cmd Beacon Every
Unattended Operations
Packet Formatting
Transmit Timing
Commands Affecting Protocol
Packet Timing Functions
Cmd Unproto QST VIA NK6K
Packet Timing
Keyup delay = Txdelay + Axdelay * 10 in milliseconds
Keyup delay = TXDELAY*10 in milliseconds
Retry interval = Frack * 2*n +
Wait time = Dwait
Wait time = Dwait * 10 + r * Txdelay
Radio Baud Rate
Special Protocol Timing
Monitor Functions
Real-Time Clock and Time Stamping
WB9FLWN7CL C KV7BN2WX D
Conperm
Setting the MFJ-1278B to Normal Operation
How do I Invoke Multi-Connect?
Users
Easy-Mail Mailbox
Mailbox on CR
Setting Up your Easy-Mail Mailbox
Users 1 CR
Sysop CR
Your MFJ-1278B will respond with
Slot1 PN ToKB5JNZ FromKF5C BBS Bulletin
Nn free 0 Mailbox B, E, Help, J, K, L, M, R, S, T
Nn free n Mailbox B,E,Help,J,K,L,M,R,S,T
Memory Size Number of Banks
Paging Sysop any key aborts
Paging Sysop any key aborts No answer
Mailbox Operation
Title
Send msg Control-Z or /EX to end
Cannot, not yours
Slot## t m To From Subject
## CR
Callsign Busy Disconnected
Additional Mailbox Features
Forwarding
Connect requestCALLSIGN
Remote Heard Log
Chat Mode
Eliciting Reverse Forwards
Sysop
Abort
Idle Timeout
Mailbox CText
Mailbox Messages
Not found
You have new mail
?Mailbox full
None found
Slotting and Acknowledgment Priority
Description
MFJ-1278B MULTI-MODE Advanced Operation
New Parameters
Ackprior Onoff
Slots n
Remarks
Other Related Parameters
Baud Rate Frack Seconds
Frack
Initial Parameter Settings Summary
What to Expect
ACKTime
MFJ-1278B MULTI-MODE Advanced Operation
Printing Packet Pictures thru Built-in Printer Port
Using Pktpix
Packet Picture Transfer
Packet Picture transfer to the computer screen
Radio Setup for HF Packet Operation
MFJ-1278B MULTI-MODE Advanced Operation
MFJ-1278B MULTI-MODE Advanced Operation
Operating HF Packet
MFJ-1278B MULTI-MODE Advanced Operation
MFJ-1278B MULTI-MODE Advanced Operation
Yourcall CQ
Yourcall Hiscall
MFJ-1278B MULTI-MODE Advanced Operation
Check OFF Cmsg Retry
Digipeat
Dwait OFF
Maxframe
MFJ-1278B Kiss MODE, TNC-2 MODE, Host Mode
Kiss Interface for TCP/IP
Command Function Comments
Param ax0
Xflow OFF
MFJ-1278B MULTI-MODE Operational Commands Command Preface
Entering Commands
Defaults
MFJ-1278B MULTI-MODE Operational Commands
Command List
Cmd Asdfasdf
Parameters
Beacon EVERY/AFTER n
Conok on
Remarks
Cmd Conok Y
8BITCONV ON/OFF
Mode Packet Default OFF
Mode FAX/SSTV Default OFF
8LEVELS ON/OFF
16LEVELS ON/OFF
Mode FAX/SSTV DefaultON
Mode Amtor Default OFF
Aalt ON/OFF
Alockchar nn Mode CW/MCW Default $15
Mode Packet Default on
Acktime nnnn Mode Packet Default
Ackpriority ON/OFF
Altcall ssss Mode Amtor Default blank
Ansbstr cccc Mode Amtor Default blank
Cmd Unproto Qracr
Arcvchar nn Mode RTTY/ASCII Default $12
Answrqra ON/OFF
Speed Confidence Factor. Data Bit RXInvert On/Off
Asendcha nn Mode RTTY/ASCII Default $14
ASA
Aspect n Mode FAX Default
Mode All Default on
Autobaud ON/OFF
AUtolf ON/OFF Mode Pactor Default on
Autolf ON/OFF
Awlen n Mode All Default
Autotrac ON/OFF
Axhang
Axdelay n
AX25L2V2 ON/OFF
Bbsmsgs ON/OFF
Message Effect When Bbsmsgs on
Axhang n
Beacon Everyafter n Mode Packet Default Every
Bkondel ON/OFF
Bkondel on
Parity
BLP ON/OFF
Conmode TRANS/CONV
Awlen
Budlist ON/OFF
Btext text
Mailbox on line. Messages for WB9FLW, AD7I, K9NG
Buftime n
BUF n
Bufkey nnn
Space
Bwnl ON/OFF
Calira
Calset n
Canline n
Cancel Display Output
Canpac n
OFF
CBell ON/OFF Mode Pactor DefaultOFF
Cbell ON/OFF
BELL*** Connected to callsign
Change
Mode Rtty Default on
Ccitt ON/OFF
Chat
CHECKV1 ON/OFF
CHObell ON/OFF Mode Pactor Default on
Check n
CMDchr nnn 0=nn=255 Mode Pactor Default $03
Connect callsign
Cmdtime n
TNC
Conperm ON/OFF
Cmsg ON/OFF
Cmsgdisc ON/OFF
Command n
Trans
Conmode CONVERS/TRANS
Convers
Call2
Connect WA7GXD VIA N0ADI-1,WD0ETZ
Call station busy
Conok ON/OFF
Connect request call
Converse
Constamp ON/OFF
Connected to N2WX 05/28/85
Cpactime ON/OFF
CR ON/OFF
Im not here right now, but you may leave a message
Ctext text
Text
Cstatus
Cwcall ssss Mode Amtor Default blank
CWidmode nn 0=nn=255 Mode Pactor Default
Cwspeedm ON/OFF
Cwsendch nnn Mode CW Default$FF
Mode CW Default OFF
Cmd Daytime
Daytime date&time
Yymmddhhmm
Cmd Daytime 02/29/84
Dayusa ON/OFF
Delay nn
Deadtime nnn
Diddle ON/OFF
Mode ASCII/RTTY Default on
Delete ON/OFF
Digipeat ON/OFF
Disconne
Asyqover
Display class
Asyfrerr
Asyrxovr
Hovrerr
Bbfailed
Digisent
Hundrerr
Rxresync
Rxerrors
Rxlenerr
Sentfrmr
Dwait n
EAa ON/OFF Mode Pactor Default on
Display
Easin ON/OFF
Mode CW/RTTY/ASCII Default OFF
EAS ON/OFF
Echo ON/OFF
Mode Amtor Default on
ECho ON/OFF Mode Pactor Default on Parameter
ERrstrin cccc Mode Pactor Default
Epson ON/OFF
Escape ON/OFF
Mode Packet Default OFF Parameters
EXActcal ON/OFF Mode Pactor DefaultON
Farnswor ON/OFF
Faxeop ON/OFF
Faxrev ON/OFF
Mode FAX Default OFF
Faxneg ON/OFF
FEC
Forward
FLow ON/OFF Mode Pactor Default on
Flow ON/OFF
Fulldup ON/OFF
KV7DN2WX Go ahead and transfer the file
Graphlf Onoff
Headerln ON/OFF
N2WXKV7D
Healled ON/OFF
HID ON/OFF
IDTime nnn
Kiss ON/OFF
Mode Mailbox Default OFF
Kilonfwd ON/OFF
Lcok Onoff
Lc callsign
Lcalls call1,call2...,call8
LEdmode 0/1 Mode Pactor Default
LFadd ON/OFF Mode Pactor Default OFF
Lfaddalt ON/OFF
Mode ASCII/Packet Default OFF
Lfadd Onoff
Lfignore ON/OFF
Listen
Mode Amtor Immediate Command
MAILbox ON/OFF Mode Pactor Default OFF
Mailbox ON/OFF
Mailled ON/OFF
Mall ON/OFF
@ Bell \ Null Figs Ltrs
Marsmode n
TX Translations
Bell Null
Match ON/OFF
MAXDown nnn Mode Pactor Default
Maxframe n Mode Packet Default
Mbegin cccc Mode Amtor Default
MAXSum nn Mode Pactor Default
MAXUp nnn Mode Pactor Default
Mcom ON/OFF
Mcon ON/OFF
Mctext text
Mend cccc Mode Amtor Default nnnn
Mfilter n1,n2,n3,n4 Mode Packet Default none
Mode
Mhclear
Mheard
MNONAX25 ON/OFF
N2WXW5FD-3 Im ready to transfer the file now
Monitor ON/OFF Mode Pactor Default on
Monitor ON/OFF
WB9FLWAD7IHi Paul
Mrpt ON/OFF
WB9FLWAD7I,K9NG*,N2WX-7Hi Paul
Mspeed n
Mtimeout n
Mstamp ON/OFF
Multifax ON/OFF
Mycall call-n
MYcall callsign Mode Pactor Default Mfjpactr
Myalias call-n Mode Packet Default blank
Myselcal ssss
Myhierad Text Mode Mailbox Default
Mymcall callsign
Navtex ON/OFF
Mode Navtex DefaultOFF
Navstn Text Mode Navtex Default ALL
Newmode ON/OFF
Navmsg
LORAN-C
NO200 ON/OFF
Mode Pactor Default OFF
Nodeforw node Mode Mailbox Default
Nomode ON/OFF
Nodepath text string Mode Mailbox Default
Cmd Nodepath C KB4VOL Cmd Nodeforw PSL5
Nucr ON/OFF
Nulls n
Omlc ON/OFF
Paclen n Mode Packet Default
Pactime Everyafter n Mode Packet Default After
Pass n Mode Packet Default $16
CTRL-V CTRL-C
Passall ON/OFF
Syn
Pixtones n
White Lt gray Dark gray Black Area
TransmitTones Hz
Pixtones Values HEX
FAX/SSTV
Pktpix ON/OFF
Mode Packet Immediate Command
Entering transparent mode for packet-pix reception
Printtes
Printgra ON/OFF
Printer ON/OFF
PTOver nnn 0=nn=255 Mode Pactor Default $19
PTSend
Randomcw ON/OFF
QRT
Radio n
Rbitmask $xx Mode RTTY/ASCII Default
Reconnect call1 VIA call2,call3...,call9 Mode Packet
Remsysop call-n Mode Mailbox Default Blank
Redispla n
Restore
Reset
Resptime n Mode Packet Default
Restart
Retry n
RETries nnn 0=nn=255 Mode Pactor Default
Revflim call-n Mode Mailbox Default
RFE ON/OFF
Rinv ON/OFF
PID
Rxblock ON/OFF
$FF
Data
Rxbright n
Rxbr n TVBreak Values
Rxcal
Calset Adjustment & Location Map
Rvfalway ON/OFF
Rxinvert ON/OFF
Serialno n Mode CW Default
Sstv
Setup
Modem Default Baud Rate Speed/ Format
Sfnl ON/OFF
Slots nnn Mode Packet Default
Solf ON/OFF
STatus
Srxall ON/OFF
Start n
Status
Stop n
Streamca ON/OFF
Streamsw n
Streamdb Onoff
This is a test
Mailbox
Timedcmd text string Mode Mailbox Default
Timedmin n Mode Mailbox Default
String- max 119 chars
KV7BCQ,KF7B*this is a test message
TRace ON/OFF Mode Pactor Default OFF
Trace ON/OFF
ModePacket Default OFF
Trflow ON/OFF
Tuneproc
Tries n Mode Packet Default None
Tune
Tvhsync ON/OFF
Tvbreaks n Mode Sstv Default see below
Mode Sstv Default OFF
Tvmode n Mode Sstv Immediate Command
Txdelay n Mode Packet Default
TVX ON/OFF
Txdelayc = Radio-PTT-delay-time / Time-per-character
TXDelay n Mode Pactor Default 2 60ms
Txdelayc nnn
Baud Rate Time-per-character
Txdiddle ON/OFF
Txinvert ON/OFF
Txtmo n Mode Packet Default
Txflow ON/OFF
U2 UNproto
Txuiframe ON/OFF
U1 UNproto
Unshift ON/OFF
URepeats nn Mode Pactor Default
Users n Mode Packet Default
Visticks nnnn Mode Sstv Default0
Defaults Nibble Tone
Wdmode ON/OFF
WAitdisc nn Mode Pactor Default
Weight n Mode CW Default
WRU
Xoff n Mode All Default $13
Xmitok ON/OFF
XON n
XOff nn
XOn nn
Was
BbRAM loaded with defaults
Packet Messages
? Expected bank n....x
MFJ-1278B MULTI-MODE System Messages
Too many packets outstanding
Message saved
?call
Command Mode Error Messages
?bad
?clock not set
?VIA
Link Status Messages
Callsign busy
Connected to call1 VIA call2,call3...,call9
Connect requestcall1 VIA call2,call3...,call9
Frmr frame just sent Frmr sent
Frmr rcvd
LINKOUTOFORDER, possible datalossopt.daytime stamp
MFJ-1278B Specifications
MFJ-1278B MULTI-MODE Hardware
BbRAM
Power Required
General Description
Protocol
Dividers and Baud-rate Generator
Detailed Circuit Description
Oscillator
CPU Complex
Serial Interface
Modem
Watch-dog Timer
Power Supply
RS-232C Handshaking Protocol
MFJ-1278B MULTI-MODE Hardware
MFJ-1278B MULTI-MODE Hardware Jumper Functions
Jumper # Position Function
JMP18
JMP16
JMP17
JMP19
Jmpd
Jmpb
Jmpc
Jmpe
Parallel Printer Port PIN FUNCTION,J12
Printer Port Pin # Pin Function
J5 Pin # Pin Function
External Modem Interface Connector J14
J13 Pin # Pin Function
Pin 2 Carrier Detect Output
MFJ-1278B MULTI-MODE Hardware Modem Disconnect HEADER, J4
Pin 1 Carrier Detect Input
Pin 3 SIO Special Interrupt Input
Pin 7 Connect Status Output
Pin 5 SIO RTS Output
Pin 6 Transmitter Key Input
Pin 8 Unacknowledged Packets Pending Status Output
HF Tuning Indicator
MFJ-1278B MULTI-MODE Troubleshooting
General Tests
Obvious Problems
Assembly Problems
Symptom TNC appears dead
Specific Symptoms
Cabling Problems
Oscillator and Reset Circuits
Symptom Modem wont calibrate or key transmitter
Symptom MFJ-1278B wont sign on to the terminal
Terminal Interface Troubleshooting
Symptom Uncopyable transmitted or received packets
Symptom The MFJ-1278B signs on OK but wont accept commands
Physical Layer
Data Link Layer
MFJ-1278B MULTI-MODE Packet Radio Protocol
Hdlc Frames
AX.25 Level TWO
Code Abbrv Frame Type
Sabm
RNR
REJ
Disc
Page
Channel Flow Control
MFJ-1278B MULTI-MODE Appendix a Radio Hookup
Table A-1HOOKUP for Specific Radios
Table A-1.2Other Radio Connections
Calibration Method
MFJ-1278B MULTI-MODE Appendix B Modem Calibration
MODULATOR/DEMODULATOR Frequency Calibration
Test equipment needed
Multilevel xmit...1900
Demodulator Alignment
Multilevel demod 307 154KHz 1550 Hz 106
2250 Hz 70
R79
Calibration Procedure
= INT 525000 / Flow +
Comprehensive Alignment Procedure
Set Modulator Tones Using Built-in Calibration Software
Demodulator Center Frequency Alignment
= INT 525000 / Fhigh +
Tuning Indicator Alignment
Alignment Procedure
MFJ-1278B MULTI-MODE Appendix B Modem Calibration
MFJ-1278B Adjustment Location Map
Calset Values for Various Modulator Tone Frequencies
Calset #
Page
Detailed CW Demodulator Alignment Procedure
MFJ-1278B MULTI-MODE Appendix B Modem Calibration
MFJ-1278B MULTI-MODE Appendix B Modem Calibration
Audio Output Level Adjustment Procedure
Cali CR
MFJ-1278B MULTI-MODE Appendix C Audio Output
Radio 2 CR
MFJ-1278B MULTI-MODE Appendix D HF Radio HF Radio Alignment
First Method Noise Average Frequency
Fc = Flow+Fhigh/2
Page
MFJ-1278B MULTI-MODE Appendix E Converting to TNC-2
BPS Packet Setup
Mode VP,2400 CR
MFJ-1278B MULTI-MODE Appendix F 2400 BPS Packet
BPS Receive Audio Setting
BPS Transmit Audio Setting
CN-6 Jumper Position Transmit Audio Range no load
JMP13
JMP14
MFJ-1278B MULTI-MODE Appendix G Jumper Functions
Jmpa
Jmpz
Fig. G-1 Jumper Connector Location
MFJ-1278B MULTI-MODE Appendix H Command Summary
Acktime
BLP
Conperm
Deadtime
FEC
Lfignore
Mrpt
Pactime
Retry
Timedmin
Users
RESISTORS, 1/4 WATT, 5%
MFJ P/N
Descrpition Component ID
MFJ-1278B MULTI-MODE Appendix I Parts List
RESISTORS, 1/8 WATT, 1%
POT 17MM Single TURN, PCB Mount
TRIMPOTS, Bourns or Equal
Trim POT Single TURN, Miniature
Capacitors MULTI-LAYER, Monolithic Ceramic
Capacitors MYLAR, 50V/100V
Capacitors Electrolytic
ICS
Capacitor Other Types
IC Sockets LOW Profile
Do not use 74HCT14 for these ICs
DIODES/LEDS
Transistors
Connectors
Voltage Regulator
Miscellaneous
Grayscale PC Board Assembly
For Installing Cover
Display PC Board Assembly
Mounting NUT for R131
Addition Parts for MFJ-1278BT only
BOM for Display PC Assembly P/N
This is to Insure Good Contact with Chassis Reduce EMI
Trimpot 15 Turns, Bourns or Equal
BOM for Grayscale PC Assembly P/N
Resistors 1/8W, 1%
IC Sockets
Descrpition Component ID Capacitor Monolithic Ceramic
Capacitor Electrolytic
ICs
RESISTOR, 1/4 WATT, 5%
RESISTOR, Trim POT, Single TURN, MINIATURE, Horzontal
RESISTOR, 1/8 WATT, 1%
RESISTOR, NETWORK, SINGLE-ON-LINE, Isolated
Capacitors Disc Ceramic
Diodes
CENTER, 3 POS. Header
CENTER, TOP ENTRY,10 POS CN1 Dual ROW Socket Connector
CENTER, Right Angle JMP 14B POS. Header
POS. Shorting Jumer for CN6
Manual Index
MFJ-1278B MULTI-MODE Manual Index
Autotrac
MFJ-1278B MULTI-MODE Manual Index
MFJ-1278B MULTI-MODE Manual Index
MFJ-1278B MULTI-MODE Manual Index
MFJ-1278B MULTI-MODE Manual Index
MFJ-1278B MULTI-MODE Manual Index
MFJ-1278B MULTI-MODE Manual Index
Connect
CW KEY-IN
Cwspeedm
MFJ-1278B MULTI-MODE Manual Index
FARnswor, 73, 75 Farnsworth CW, 75 FCS\, Hdlc field
Introduction
MFJ-1278B MULTI-MODE Manual Index
Normal CW
MFJ-1278B MULTI-MODE Manual Index
MFJ-1278B MULTI-MODE Manual Index
MFJ-1278B MULTI-MODE Manual Index
Txdelay