User ManualTable of ContentsINTRODUCTION1COMPUTER INTERFACING4MFJ Starter Packs4Computer Interface with MFJ Starter Pack5Computer Interface without MFJ Starter Pack5SERIAL PORT SIGNALS5COMPUTER WITH SPECIFIC SERIAL INTERFACES6Apple Macintosh6Commodore C64, C128 and VIC-207IBM PCjr7Radio Shack Color Computer8Color Computers8IBM PC/XT/AT/386/486 and compatibles Computer8Other Computers with Nonstandard Serial Ports9TERMINAL SOFTWARE REQUIREMENTS10Apple Macintosh10Apple II, II+, IIe, IIc10Commodore C64, C128 and VIC-2011IBM PCjr11IBM and Compatible Computers11Radio Shack Color Computer12Radio Shack Model 100/102 and NEC 820112MFJ-1278B SERIAL PORT PIN FUNCTIONS12COMPUTER BAUD RATE13Autobaud13Changing Terminal Baud Rate14VERIFYING SERIAL PORT OPERATION15PARALLEL PRINTER PORT16Printer Port Connection16Printer Consideration17Printer Port Test17RADIO INTERFACING18MFJ-1278B Radio Ports18RADIO PORTS CONNECTION19HANDHELD RADIO CONNECTION20RADIO INTERFACING METHODS21Method 1: Direct Connection to Microphone and Speaker21Transmit Audio Level Adjustment for Method I Interface21Setting the Receiver Audio Input Level22FSK CONNECTION29GETTING STARTED30First Steps30Basic Commands30SERIAL PORT CONFIGURATION31Parity and Word Length32Echos32New Lines and Line Wrapping33THE MFJ-1278B MULTI-MODE MODEM33OPERATIONAL MODES35Verifying Operation Status35Mode Switching With the MODE Command35Radio Port Switching36MEMORY BUFFERS36Loading the Memory Buffers37Transmitting the Memory Buffers37Buffer Serial Numbering37Memory Repeat and Buffer Repeat Time38Chaining the Memory Buffers38TUNING INDICATOR39PACKET OPERATION40VHF Packet40A Connecting and Disconnecting Exercise40Digipeating42Unsuccessful Connections43Monitoring Channel Activity43Your First Packet QSO45Starting the QSO45Digipeating46Monitoring on the Air47Special Input Characters47BASIC HF PACKET OPERATION49HF Packet Operation Hints50PACTOR51What is Pactor?51PACTOR Operation51FEC Unproto operation52PACTOR ARQ53Changeover53Monitoring53Monitoring AMTOR ARQ requests54Exiting PACTOR Mode54CONNECT56SPEEDup/SPEEDdown56AUTOMATIC ON-LINE COMPRESSION56FLOW CONTROL56AMTOR while in PACTOR mode56Amtor Detection in Pactor57PACTOR STATUS INDICATORS.57PACTOR MAILBOX58Setting Up your Pactor Mailbox58General Overview60Detailed Pactor Mailbox Overview63Mailbox Messages67CW OPERATION68Receiving CW69Transmitting CW70Transmitting from Memory Buffers71CW Weighting71Tuning your Radio72Random Code Generator72Setting Up the for Code Practice73CW CONTEST MEMORY KEYER OPERATION74Sending CW with External Key Paddle74MODULATED CW OPERATION75BAUDOT RTTY & ASCII OPERATION76Setting Up for ASCII and RTTY Operation76RTTY and ASCII Receiving77RTTY and ASCII Transmitting77BAUDOT RTTY OPERATION HINTS78Commercial RTTY Reception79AUTOMATIC SIGNAL ANALYSIS80ASA OPERATION80MARS OPERATION82Configuring for MARS82Operating MARS with MultiCom for IBM83The MARsmode Command83MARSMODE 1- QSO Mode84MARSMODE 3- Storage Mode84AMTOR OPERATION85Mode A "ARQ"85Setting up for Mode A Operations85Operating Mode A86Monitoring Mode A, "ARQ"87Summary of AMTOR Contact Sequence90NAVTEX OPERATION91Navtex Stations and Frequencies91Navtex Operation91FAX OPERATION94FAX Formats95FAX Frequency96FAX Installation96Printer Connection96Receiving FAX97Receiving FAX to the Printer97Display FAX Picture on Computer Screen & Save it to Disk99Two Level FAX Picture Format99Multi-level FAX Picture Raw Data Format100Transmitting FAX101Two Level FAX Transmitting101Multi-level FAX Transmitting102Creating FAX Pictures for Transmitting104SLOW SCAN TELEVISION OPERATION105SSTV Formats106SSTV Installation106Printer Connection106Receiving SSTV Pictures107SSTV Printing to the Printer107Printing SSTV Pictures to the Screen110Saving SSTV Pictures to Disk111Terminating SSTV Printing111Transmitting SSTV Pictures111Creating SSTV Pictures for Transmitting112ADVANCED PACKET OPERATION114SPECIAL CHARACTERS114PACKET OPERATING MODES115Command Mode115Entering Data-Transfer Modes116Converse Mode117Transparent Mode118FLOW CONTROL119XON/XOFF Flow Control120Hardware Flow Control121Type-in Flow Control121DETAILED VHF PACKET OPERATION121Station Identification121Packet Timing125Radio Baud Rate126Special Protocol Timing127Monitor Functions127Real-Time Clock and Time Stamping128Multi-Connect Guide129Setting the MFJ-1278B to Normal Operation129How do I Invoke Multi-Connect?129Easy-Mail Mailbox130Setting Up your Easy-Mail Mailbox131Mailbox Operation136Additional Mailbox Features140Forwarding:140Eliciting Reverse Forwards:141Remote Heard Log:141Chat Mode:141Page SYSOP:141Remote SYSOP:142Mailbox CText:142Idle Timeout:142Abort:142Mailbox Messages142Slotting and Acknowledgment Priority144Description144New Parameters146Other Related Parameters148Initial Parameter Settings Summary149What to Expect149Packet Picture Transfer151Printing Packet Pictures thru Built-in Printer Port151Using PKTPIX151Packet Picture transfer to the computer screen151DETAILED HF PACKET OPERATION152Radio Setup for HF Packet Operation152Operating HF Packet155MFJ-1278B KISS MODE, TNC-2 MODE, HOST MODE161KISS INTERFACE FOR TCP/IP161COMMAND PREFACE163ENTERING COMMANDS163Command List164COMMAND NAME164Defaults164Link Status Messages302MFJ-1278B SPECIFICATIONS305GENERAL DESCRIPTION306DETAILED CIRCUIT DESCRIPTION307Oscillator307Dividers and Baud-rate Generator307CPU Complex308Serial Interface308Watch-dog Timer309Modem309Power Supply309RS-232C HANDSHAKING PROTOCOL310JUMPER FUNCTIONS312PARALLEL PRINTER PORT PIN FUNCTION,J12315TTL INTERFACE PORT PIN FUNCTION,J5316MULTI-LEVEL INTERFACE CONNECTOR,J13317EXTERNAL MODEM INTERFACE CONNECTOR - J14317MODEM DISCONNECT HEADER, J4318HF TUNING INDICATOR320GENERAL TESTS321Step 1: Power Supply322Step 2: Obvious Problems322Step 3: Assembly Problems322Step 4: Cabling Problems323SPECIFIC SYMPTOMS323Symptom: TNC appears dead323Oscillator and Reset Circuits323Digital Logic Lines323Symptom: Modem won't calibrate or key transmitter324Symptom: Uncopyable transmitted or received packets325TERMINAL INTERFACE TROUBLESHOOTING325Symptom: MFJ-1278B won't sign on to the terminal325printed on the terminal326Symptom: The MFJ-1278B signs on OK but won't accept commands326commands326EXPLANATION OF PROTOCOL327Physical Layer327Data Link Layer327HDLC FRAMES328AX.25 LEVEL TWO329Comprehensive Alignment Procedure340Set Modulator Tones Using Built-in Calibration Software340Demodulator Center Frequency Alignment341Tuning Indicator Alignment342CW MODEM TUNE-UP PROCEDURE346Detailed CW Demodulator Alignment Procedure347AUDIO OUTPUT CALIBRATION350Audio Output Level Adjustment Procedure350HF RADIO ALIGNMENT352FIRST METHOD: NOISE AVERAGE FREQUENCY352SECOND METHOD: FILTER SKIRT AVERAGE FREQUENCY353CONVERTING THE MFJ-1278B TO "LIKE-TNC 2"354MFJ-1278B 2400 BPS PACKET3562400 BPS PACKET SETUP3562400 BPS Receive Audio Setting3572400 BPS Transmit Audio Setting357JUMPER FUNCTIONS AND LOCATIONS358COMMAND SUMMARY362MFJ-1278B/1278BT PARTS LIST373Size: 1.76 MBPages: 406Language: EnglishOpen manual
