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MFJ MFJ-1272M, Instruction Manual, Page: 2 / 20

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MFJ-1272M Instruction Manual 

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KAM® is a registered trademark of Kantronics Company, Inc. 

Summary of Contents for MFJ-1272M

Page 1: ...des MFJ 1272M All MFJ TNCs TAPR TNC 2 clones and PK 12 96 900 MFJ 1272MX PK 232 MFJ 1272MYV KAM VHF port KPC 9612 KPC 2 KPC 3 MFJ 1272MYH KAM HF port MFJ 1272MZ PK 88 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 ...

Page 2: ...MFJ 1272M Instruction Manual 2 KAM is a registered trademark of Kantronics Company Inc ...

Page 3: ... 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 p...

Page 4: ...se external audio make no connection here MIC Audio Audio from mic same as Audio Out Ground This is the system ground on radio s mic connector Some radios have two ground pins MICROPHONE GROUND and GROUND The microphone ground should not be used due to the possibility of introducing hum into the system Always use the pin labeled ground ...

Page 5: ...e of an interconnecting cable to supply RECEIVE AUDIO to the TNC MIC switch You would connect the cable from an External Speaker or Headphones jack on your radio to the AUDIO IN jack of the TNC MIC switch Therefore no jumper connection should be made for Receive on the pc board Using the method above for connecting RECEIVE AUDIO to the TNC MIC switch will cut off the internal speaker inside the ra...

Page 6: ...set the jumpers depending on the TNC functions versus the MIC pins of your particular radio Be sure to follow the tables closely with your radio manual close at hand to verify that you are not shorting any microphone voltages or any other microphone signals to GROUND ...

Page 7: ...1A RECEIVE R8A 2 HD1 RECEIVE R2A RECEIVE R7A 3 HD1 RECEIVE R3A RECEIVE R6A 4 HD1 RECEIVE R4A RECEIVE R5A 5 HD1 RECEIVE R5A RECEIVE R4A 6 HD1 RECEIVE R6A RECEIVE R3A 7 HD1 RECEIVE R7A RECEIVE R2A 8 HD1 RECEIVE R8A RECEIVE R1A Table 1 Refer to External Audio page 3 PTT Push to Talk Connections Table 2 below shows where you would place a jumper depending on what microphone pin is designated PTT For e...

Page 8: ...MFJ 1272M Instruction Manual 8 7 HD1 PTT R7B PTT R2B 8 HD1 PTT R8B PTT R1B Table 2 ...

Page 9: ...C AUDIO OUT R6C 4 HD1 AUDIO OUT R4C AUDIO OUT R5C 5 HD1 AUDIO OUT R5C AUDIO OUT R4C 6 HD1 AUDIO OUT R6C AUDIO OUT R3C 7 HD1 AUDIO OUT R7C AUDIO OUT R2C 8 HD1 AUDIO OUT R8C AUDIO OUT R1C Table 3 Ground Connections Table 4 below shows where you would place a jumper depending on what microphone pin is designated GROUND For example if GROUND is designated as being pin 7 on a Kenwood microphone then yo...

Page 10: ...MFJ 1272M Instruction Manual 10 Tabel 4 Always use the MIC pin designated as GROUND not mic ground The use of MIC GROUND could result in audio hum in the system ...

Page 11: ...ent for Kenwood Yaesu Jumper Placement for Icom Radio Shack 1 HD2 R1E M1A R8E M8A 2 HD2 R2E M2A R7E M7A 3 HD2 R3E M3A R6E M6A 4 HD2 R4E M4A R5E M5A 5 HD2 R5E M5A R4E M4A 6 HD2 R6E M6A R3E M3A 7 HD2 R7E M7A R2E M2A 8 HD2 R8E M8A R1E M1A Table 5 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 Kenwoo...

Page 12: ...MFJ 1272M Instruction Manual 12 6 HD2 AUDIO IN M6B AUDIO IN M3B 7 HD2 AUDIO IN M7B AUDIO IN M2B 8 HD2 AUDIO IN M8B AUDIO IN M1B Table 6 Refer to External Audio page 3 ...

Page 13: ...roperly by making the right connections the first time If you find yourself in need of technical help please refer to the Technical Assistance section of this manual Please have all necessary notes and data ready so we can provide you with the best possible service at the time of your call Note Jumper positions for specific radios are detailed on page 8 Note The FT 2400H and FT 2500H are the only ...

Page 14: ...MFJ 1272M Instruction Manual 14 Jumper Placement Diagrams for specific radios ...

Page 15: ...he 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 So if your RECEIVE AUDIO is on pin 3 of your Icom microphone then you would place a jumper on R6A in the RECEIVE section of...

Page 16: ...MFJ 1272M Instruction Manual 16 ...

Page 17: ...he microphone connector on the front panel of the MFJ 1272M Make sure that that you hear a click when the microphone snaps into place 2 Connect the gray 8 pin MIC plug which exits the rear of the MFJ 1272M out of the TO RADIO slot to the microphone jack on the radio 3 Connect the TNC cable which exits the rear of the MFJ 1272M out of the TO TNC slot to the TNC External Receive Audio Connection If ...

Page 18: ...MFJ 1272M Instruction Manual 18 3 5mm mono plug with the tip being positive and the sleeve ground ...

Page 19: ...he 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 You can also send questions by mail to MFJ Enterprises Inc 300 Industrial Park Road Starkville MS 39759 by Facsimile to 601 323 6551 or by email to techinfo mfjenterprises com Send a complete description of your proble...

Page 20: ...MFJ 1272M Instruction Manual 20 Schematic ...

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