MFJ-464 Instruction Manual CW Keyer/Reader
43
Jumper Settings
The jumper settings come factory defaulted so that the RADIO SPKR jack is connected directly
to the RADIO IN jack, and the transmitted sidetone is output to the SIDE TONE jack. An
external speaker can be connected to the RADIO IN jack to monitor the received signal, since
the receiver is connected to the RADIO IN jack. Another speaker can be connected to the SIDE
TONE jack to monitor the transmitted sidetone.
To change these factory defaults you must remove the cover to the MFJ-494 and find the four
jumpers located in the upper right-hand corner of the unit. Jumper JMP1 enables and disables
the audio at the SIDE TONE jack. To hear both the transmitted sidetone and the received signal
on the speakers connected to the RADIO SPKR jack, short either jumpers JMP2 and JMP4 or
jumpers JMP3 and JMP5. Shorting jumpers JMP2 and JMP4 provides a higher sidetone level to
the RADIO SPKR jack, whereas, shorting jumpers JMP3 and JMP5 provides a lower sidetone
level to the RADIO SPKR jack.
Troubleshooting
Q. Why can't I enable the Farnsworth mode?
A. The overall speed is at its maximum of 99 WPM.
Q. Why do I get extra linefeeds when uploading to the computer?
A. Configure your terminal program to strip the linefeeds from the carriage returns.
Q. The keyer is acting erratic?
A. Reset the keyer to factory defaults setting by pressing both Mode and MSG2 buttons while
turning the power on.
Q. How come I cannot increase the character spacing?
A. The word spacing must be at least four units more than the character spacing.
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 reading the manual
you may call MFJ Technical Service at 662-323-0549 or the MFJ Factory at 662-323-5869.
You will be best helped if you have your unit, manual and all information on your station handy
so you can answer any questions the technicians may ask.
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road,
Starkville, MS 39759; by FAX to 662-323-6551; or by email to techinfo@mfjenterprises.com.
Please include a complete description of the problem, an explanation of exactly how you are
using the unit when the problem arises, and a complete description of any equipment you are
using with this unit, such as a computer (including applicable software) or radio.
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