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MFJ-1272M Instruction Manual
Through Connections
Table 5 below shows where you would place jumpers, depending on the
microphone pin functions that are not to be switched by the MFJ-1272M.
Microphone pins designated, +V, UP, DWN, are radio functions that are not
needed by the TNC, but are needed for normal microphone operations.
example, if on a Kenwood microphone pin 3 is designated as being UP, which
would be for increasing your frequency readout on the radio, then you would place
a jumper on the HD2 header position on the MFJ-1272M PC board labeled R3E-
M3A.
Radio MIC
MFJ-1272M
Pin
1
2
3
4
5
6
7
8
Mic Audio Connections
Table 6 below shows where you would place a jumper, depending on what
microphone pin is designated, MIC AUDIO. For example, if on a Kenwood, MIC
AUDIO is designated as being pin 5 of the microphone, then you would place a
jumper on position M5B in the AUDIO IN section of header HD2.
Radio MIC
MFJ-1272M
Pin
1
2
3
4
5
6
7
8
*Refer to External Audio , page 3
6
Jumper Placement for
Header
Kenwood & Yaesu
HD2
HD2
HD2
HD2
HD2
HD2
HD2
HD2
Jumper Placement for
Header
Kenwood & Yaesu
HD2
AUDIO IN--M1B
HD2
AUDIO IN--M2B
HD2
AUDIO IN--M3B
HD2
AUDIO IN--M4B
HD2
AUDIO IN--M5B
HD2
AUDIO IN--M6B
HD2
AUDIO IN--M7B
HD2
AUDIO IN--M8B
R1E - M1A
R2E - M2A
R3E - M3A
R4E - M4A
R5E - M5A
R6E - M6A
R7E - M7A
R8E - M8A
Table 5
Table 6
Jumper Placement for Icom
& Radio Shack
R8E - M8A
R7E - M7A
R6E - M6A
R5E - M5A
R4E - M4A
R3E - M3A
R2E - M2A
R1E - M1A
Jumper Placement for Icom
& Radio Shack
AUDIO IN--M8B
AUDIO IN--M7B
AUDIO IN--M6B
AUDIO IN--M5B
AUDIO IN--M4B
AUDIO IN--M3B
AUDIO IN--M2B
AUDIO IN--M1B
For
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