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MFJ-1278B MULTI-MODE APPENDIX G: JUMPER FUNCTIONS
Table G-1: Jumper Function (Cont.)
JMPF*** ON (default) Disable Low Tone RTTY Demod
OFF Enable Low Tone RTTY Demod
JMPG*** ON (default) Disable Low Tone RTTY Mod
OFF Enable Low Tone RTTY Mod
JMPH*** ON (default) Disable Low Tone RTTY Mod
OFF Enable Low Tone RTTY Mod
JMPJ ON TX audio has flat response
OFF (default) TX audio 6db/oct pre-emphasized
JMPK ON TX audio loopback to PTT
OFF (default) (for Radio Port 2)
JMPL ON TX audio loopback to PTT
OFF (default) (for Radio Port 1)
JMPR ON Analog audio loopback
OFF (default) (for Radio Port 1)
JMPX ON (default) Speaker Transmit Tone Enable
OFF SpeakerTransmit Tone Disable
JMPY ON (default) Speaker Receive Tone Enable
OFF Speaker Receive Tone Disable
JMPZ ON (default) Speaker Connect Tone Enable
OFF Speaker Connect Tone Disable
* When JMP23 is shorted, it will RESET the MFJ-1278B. This means that all parameters
will be reset to the default values. This is the same as removing the bbRAM battery except it
is much quicker. DO NOT SHORT THIS JUMPER MORE THAN A COUPLE OF
SECONDS, OTHERWISE BATTERY DAMAGE COULD RESULT!!
** MFJ offers an optional Real-time clock module (MFJ-43) that can be installed on the
MFJ-1278B mother board. This clock keep the MFJ-1278B clock running all the time. You
will not have to reset the clock everytime you turn the MFJ-1278B on.
*** When these jumpers (JMP E, JMP F, JMP G, JMP H) are removed the MFJ-1278B will
operate RTTY using the European tone standard, when the VB modem is selected. All four
jumpers must be removed in order to operate RTT using the European tone standard.