MFJ-1272M Instruction Manual
3
Installation
Before you install the MFJ-1272M TNC/MIC switch, you
must set it up for your particular radio. The MFJ-
1272M comes pre-wired from the factory for Kenwood
radios
without
RECEIVE AUDIO on the microphone jack.
If you have one of these radios, the TNC/MIC switch is
ready to use. If you have a Kenwood radio
with
RECEIVE
AUDIO on the microphone jack, or if your radio is not a
Kenwood, refer to the configuration section. We have
given a few diagrams for placing the internal jumpers
for a few popular radios on Page 8.
The MFJ-1272MYH model comes pre-wired and ready to use
with the HF port on the Kantronics KAM
and Icom IC-
706. The jumpers are setup for the IC-706 with RECEIVE
AUDIO on pin 3 of the microphone plug.
Configuration
If you must configure the TNC/MIC switch for your
radio, please follow this procedure.
1.
Remove the two screws and top cover of the MFJ-
1272M.
2.
Look at the writing on the unit's pc board. Please
refer to Tables 1 thru 6 as to where to place the
jumpers in relation to the pinouts on you radio.
Consult your radio's manual
and the definitions
below to match signals.
Audio Out:
Audio to the radio from either the TNC or radio
MICROPHONE.
PTT:
This is the Push-to-talk signal from either the TNC
or radio Microphone.
Receive Audio:
Summary of Contents for MFJ-1272M
Page 2: ...MFJ 1272M Instruction Manual 2 KAM is a registered trademark of Kantronics Company Inc ...
Page 8: ...MFJ 1272M Instruction Manual 8 7 HD1 PTT R7B PTT R2B 8 HD1 PTT R8B PTT R1B Table 2 ...
Page 14: ...MFJ 1272M Instruction Manual 14 Jumper Placement Diagrams for specific radios ...