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Instruction Manual
MFJ-1272M TNC/MICROPHONE SWITCH
Introduction
Thank you for purchasing the MFJ-1272M TNC/MIC Switch. The MFJ-1272M is
designed to allow simultaneous connection of both your microphone and your TNC
to the radio.
The MFJ-1272M microphone switches were designed to be used with any radio
that has an 8-pin, RJ-45 modular microphone connector. Because many TNCs
have different connectors, MFJ offers 5 models:
MFJ Model#
MFJ-1272M
MFJ-1272MX
MFJ-1272MYV
MFJ-1272MYH
MFJ-1272MZ
CAUTION
Always check your radio's owner's manual to see if there is a voltage on one of the
pins of the microphone before hooking up the microphone switch. You could
damage your radio by connecting the PTT line to a voltage source. Do not connect
any pin labeled as a voltage source to PTT!!!!!
MFJ Enterprises, Inc. is not responsible for damaged radios or
Warning
associated equipment. It is your responsibility to make sure your
connections will not damage the radio.
TNC and Multimodes
All MFJ TNCs, TAPR TNC-2 clones, and PK-12/96/900
PK-232
KAM® VHF port, KPC-9612, KPC-2, KPC-3
KAM® HF port
PK-88
KAM® is a registered trademark of Kantronics Company, Inc.
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Summary of Contents for MFJ MFJ-1272M
- Page 1 TNC to the radio. The MFJ-1272M microphone switches were designed to be used with any radio that has an 8-pin, RJ-45 modular microphone connector. Because many TNCs have different connectors, MFJ offers 5 models:...
- Page 2 MFJ-1272M Instruction Manual 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.
- Page 3 Because there are so many different radio configurations, we have tried to make the MFJ-1272M as versatile as possible. With the MFJ-1272M you can virtually connect any radio pin to just about any TNC pin, just by configuring the jumpers properly.
- Page 4 MFJ-1272M Instruction Manual Receive Audio Connections Table 1 below shows where you would place a jumper if your radio has RECEIVE AUDIO on one of the microphone pins. For example, if your radio has RECEIVE AUDIO on pin 3 on a Kenwood microphone, you would place a jumper on position R3A in the RECEIVE section of header HD1.
- Page 5 MFJ-1272M Instruction Manual Audio Out Connections Table 3 below shows where you would place a jumper, depending on what microphone pin is designated MIC. The microphone designated MIC, is the pin that the transmit audio from the TNC comes into the radio. For example, if MIC is designated as being pin 1 on a Kenwood microphone, then you would place a jumper on position R1C in the AUDIO OUT section of header HD1.
- Page 6 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.
- Page 7 The jumper listings on the previous tables do not always hold true for all Kenwood, Yaesu, Icom and Radio Shack transceivers. The best way to setup the MFJ- 1272M correctly, is to have your transceiver manual handy at the time of setup .
- Page 8 MFJ-1272M Instruction Manual Jumper Placement Diagrams for specific radios...
- Page 9 DATA PORT in the back of the radio. In this case, the MFJ-1272M is totally incompatible. If you want to use the MFJ-1272M with an Icom or Radio Shack transceiver, then all jumper designations need to be thought of in reverse order. This is due to the numbering scheme on the Radio Shack and Icom microphones.
- Page 10 For example, MIC audio is designated as pin 6 in the ICOM IC-2340 manual, but on our MFJ-1272M board it is pin 3, so R3C and M3B have jumper clips on them. All other pin designations for the Icom and Radio Shack radios are also backwards.
- Page 11 MFJ Technical Service at 601-323-0549 or the MFJ Factory at 601-323-5869 . 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.
- Page 12 MFJ-1272M Instruction Manual Schematic...