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MFJ-492

Menu Driven Memory Keyer

™

Manual

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Summary of Contents for MFJ-492

Page 1: ...MFJ 492 Menu Driven Memory Keyer Manual ...

Page 2: ...our soft sectored message memories for a total of 192 characters MFJ 492 or eight memories of 1000 characters each MFJ 492X Morse Code Trainer Random code generator with 5 character or random 1 8 character length words Random characters are se lectable from alphabetic numeric or punctuation sets or specific 6 character sets Embedded Commands Auto incrementing serial numbers Timed pauses up to 99 m...

Page 3: ...gh the back plate BASIC OPERATION The Menu Driven Memory Keyer is simple to operate The push button marked PWR controls power to the unit After turning the unit on the keyer will light the four LEDs sequentially and send the characters O and N in Morse Code using the sidetone speaker This tells you the MFJ 492 is ready for operation Start sending with the paddle Adjust the volume and speed to your...

Page 4: ...d of message character If you try to save more characters than you have memory the keyer will automatically end your message send you an end of mes sage character and lock any unused messages To play a message press and release a function key quickly Embedded commands While in the save message mode you may use embedded commands for special features To use an embed ded command simply store the two ...

Page 5: ... of the intercharacter spacing A standard character break is 3 dot lengths long The number following the C is the number of extra dot lengths added to a character break FA Use Farnsworth mode to toggle between Farnsworth mode on and off Farnsworth mode works with the random code generator It sets the code character speed to 18 words per minute while keeping the overall word speed at the defined se...

Page 6: ...ote Semi Auto mode may not be used to enter messages serial numbers or in command mode Iambic On Off IA Use Iambic On Off to toggle between iambic modes on and off The keyer responds with the current mode ON or OFF Iambic mode allows you to squeeze both paddles and get alternating dashes or dots Noni ambic mode does not alternate between dots and dashes during a squeeze It plays whatever side made...

Page 7: ...e your code tutor to select exactly what you need to study Squeeze paddles to exit TYPICAL SETTINGS FOR A CONTEST This is an example of some typical settings for a contest Each contest has different rules for exchanges etc and you may have a different method of contesting This is an example of one contester s settings Memory 1 CQ TEST DE W8JI W8JI W8JI TEST Memory 2 TEST W8J1 W8JI Memory 3 UR 599 ...

Page 8: ...y entering 02 08 in the command mo de BATTERY REMOVAL AND INSTALLATION The lithium cell on this keyer should last 2 years or more The battery can be tested by removing the cover and turning the unit ON Test the voltage of the battery from the battery to the chassis The voltage tested should be over 2 7 volts or the battery should be replaced To replace the battery the unit must be powered ON The b...

Page 9: ...ON OFF WT ENABLES WEIGHT SET MODE W 0 9 SELECTS WORD BREAK LENGTH 01 09 SELECTS RANDOM CODE 6 CHARACTER SETS TECHNICAL ASSISTANCE If you have any problem with this unit first check the appropriate section of this manual If the manual does not reference your problem or your problem is not solved by following the manual you may call MFJ toll free at 1 800 647 TECH 8324 or FAX to 601 323 6551 or TELE...

Page 10: ...15 Ω R8 RESISTOR POT LINEAR TAPER 10 250 Ω R10 RESISTOR WATT 5 FILM 1 5 kΩ R11 RESISTOR WATT 5 FILM 20 kΩ R13 R14 R15 R9 RESISTOR WATT 5 FILM 10 kΩ R16 RESISTOR WATT 5 FILM 470 Ω Q1 TRANSISTOR DARLINGTON TO 92 NPN MPS A13 Q2 Q5 TRANSISTOR TO 92 NPN MOT 2N3904 Q3 TRANSISTOR TO 92 PNP MPS A92 Q4 TRANSISTOR SWITCHING VN10KM Y1 CRYSTAL HC18 U 16 MHz D1 D4 DIODE ZENER 1N5225B D2 D3 D5 D7 D8 DIODE RECTI...

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