MFJ-462B MultiReader
6
Pressing SELECT while in PRINT RAM ON/OFF sub-menu enables printing of the RAM buffer to an EPSON or
compatible printer. The printer must be attached to the DB-25 female connector labeled PRINTER PORT on the
rear of the MFJ-462B. This feature is only for printing the RAM buffer characters being displayed during RAM
PLAYBACK. The PRINT RAM ON/OFF feature is not for "real-time" printing of characters received off-the-air.
Pressing the SELECT button while in the CLEAR RAM sub-menu erases all characters currently in the RAM
buffer. In order to exit this sub-menu without changing the RAM options, press the OPTION button until the
display reads MAIN MENU, then press the SELECT button to exit.
REVERSE SETUP
This sub-menu allows you to enable or disable the REVERSE mode for RTTY, ASCII, AMTOR FEC. There are
two sub-menu selections under the REVERSE SETUP sub-menu:
1. REVERSE ON/OFF
2. MAIN MENU
Press the OPTION button to change the sub-menu options, then press the SELECT button to change modes. If
you press SELECT in the REVERSE ON/OFF option, the MFJ-462B will toggle the reverse mode. It will display
the current state for approximately one second then switch to the main menu. If the reverse mode is set to ON, then
the MFJ-462B will invert each bit received. To exit this sub-menu without changing the reverse mode, press the
OPTION button until the display reads MAIN MENU, then press the SELECT button to exit.
PRACTICE KEY
This sub-menu allows you to enable or disable the practice mode for the CW hand key. There are two sub-menu
selections under the PRACTICE KEY sub-menu:
1. PRACTICE ON/OFF
2. MAIN MENU
Press the OPTION button to change the sub-menu options, then press the SELECT button to enable the practice
session. If you press SELECT in the PRACTICE ON/OFF option, the MFJ-462B will enter the hand key practice
mode. All keying performed through the HAND KEY jack will be decoded and displayed on the LCD. In
addition, the decoded data will be sent to the printer port, as well as recorded in the RAM for future review. To
listen to the code, place the SPEAKER SELECT switch beside the HAND KEY jack IN to the HAND KEY
position. For normal operation, this switch should be in the RADIO (OUT) position. To exit the practice mode,
press either the SELECT or the OPTION button. To exit this sub-menu without entering the practice mode, press
the OPTION button until the display reads MAIN MENU, then press the SELECT button to exit.
Radio Tuning:
Proper tuning of your radio is critical to achieve optimum performance from your MFJ-462B. First, scan the bands
for a strong, clean signal. Then vary the frequency dial slightly and look for the following conditions.
CW
For maximum performance on CW, push the DATA/CW switch on the front panel IN to the CW position. This
will, however, slightly degrade performance of the data modes.
Before tuning to a CW station, set the THRESHOLD control fully clockwise. This sets the demodulation
bandwidth to the maximum. The MFJ-462B is calibrated for optimum CW performance with a 700 Hz audio tone.
Vary the frequency dial on your radio until both the DATA and LOCK LEDs follow the received audio signal.
Now turn the THRESHOLD control counter-clockwise until the DATA LED "loses" the signal. Fine tune your
radio until the DATA LED once again follows the CW signal. Repeat the above steps until you have adjusted the
THRESHOLD control to the minimum possible for "good copy". With the minimum bandwidth selected, the MFJ
462B will demodulate clean CW because the input circuit rejects noise that would otherwise interfere with the
signal.
