MFJ-1251 MFJ Microphone Control Center Instruction Manual
MFJ Microphone Control Center
INTRODUCTION
Thank you for purchasing the MFJ Microphone Control Center. It allows you to mix and match Microphones and
Radios. Switching Microphones and Radios has never been so fast and easy.
Movable jumpers that transfer the Mic Audio, PTT, Power and the Ground functions allow you to make most 8-pin
Microphones compatible with most 8-pin Radios.
WHAT IS INCLUDED
Before rushing into getting the product connected up and ready to use, please take the time to check the contents of
the package to ensure that everything is in the box.
The cables that are sent with this unit should cover most Microphone to Radio setups. Use the MFJ-5397MX for
the Modular Style Radios and MFJ-5398 for the 8 Pin Round Style Radios.
CAUTION: READ THESE INSTRUCTIONS THOROUGHLY PRIOR TO ATTEMPTING TO HOOK UP
YOUR MFJ-1251 TO YOUR MICROPHONE AND RADIO. SEVERAL CAUTIONS ARE GIVEN AND
SHOULD BE FOLLOWED SO NO DAMAGE WILL OCCUR TO YOUR RADIO OR MICROPHONE.
FRONT PANEL CONNECTIONS AND CONTROLS:
Here is a small picture of the front panel of the MFJ-1251 showing the connectors. We have also included a short
explanation of the connectors.
MICROPHONE IN: This is where you plug either the 8 Pin Round Microphone Connector or your RJ-45
Modular Microphone Connector.
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MFJ-1251 MFJ Microphone Control Center Instruction Manual
REAR PANEL CONNECTORS:
Here is a small picture of the rear panel of the MFJ-1251 showing the connector.
MICROPHONE OUT: This is where the MFJ-5397MX for the Modular Style Radios or MFJ-5398 for the
8-Pin Round Style Radios is connected.
MICROPHONE AND RADIO CONNECTIONS
Different manufacturers for the different radios available may wire the same style connectors differently. The
Microphone Control Center has internal headers that use small movable jumpers to enable you to work around this
problem. For microphone input connections, the Microphone Control Center uses a common round 8-pin
microphone jack as found on most transceivers as well as an 8-pin modular jack which many transceivers now use.
Internal jumpers are used to program connections for most radio that connects to the pre-wired connectors. This
feature eliminates the need for soldering plugs or jacks and buying adapter cables.
NOTE: Some microphones and radios will not match up due to differences of microphone functions. If the
microphone pin-outs and functions do not match the radio that is to be used, be CAREFUL when making
the jumpers. Most radios have DC voltage on the microphone jacks. This voltage is used in the
microphone for various functions. Remember that all microphones have a GROUND connection. Be
CAREFUL not to accidentally jumper the DC voltage to GROUND, this could damage the radio and/or
microphone. Make sure that all microphone pin-outs and functions match before deciding to use the
microphone.
The microphone/radio setup procedure requires a few minutes of your time. Taking the few minutes needed to set
the internal jumpers correctly, will save you time in troubleshooting later on. Before you start, you will need the
manual for your radio and microphone for reference.
The following pages show the various connections possible with the MFJ-1251. First select the page for the Brand
and style of microphone you are using and the on that page locate the style radio you will be using.
Additionally if the microphone you are using requires a separate DC voltage that is to be provided from the radio
you will need to locate the proper cross connection from the tables at the end of this section.
NOTE: The following diagrams are shown with the FRONT of the MFJ-1251 facing you. Ensure correct
orientation prior to placing the jumpers.
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MFJ-1251 MFJ Microphone Control Center Instruction Manual
Alinco Modular Microphone Connector
Alinco 8 Pin Round Radio Icom Modular Radio
Icom 8 Pin Round Radio Kenwood Modular Radio
Kenwood 8 Pin Round Radio Yaesu Modular Radio
Yaesu 8 Pin Round Radio
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MFJ-1251 MFJ Microphone Control Center Instruction Manual
Alinco 8 Pin Round Microphone Connector
Alinco Modular Radio Icom Modular Radio
Icom 8 Pin Round Radio Kenwood Modular Radio
Kenwood 8 Pin Round Radio Yaesu Modular Radio
Yaesu 8 Pin Round Radio
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MFJ-1251 MFJ Microphone Control Center Instruction Manual
Icom Modular Microphone Connector
Alinco Modular Radio Alinco 8 Pin Round Radio
Icom 8 pin Round Radio Kenwood Modular Radio
Kenwood 8 Pin Round Radio Yaesu Modular Radio
NOTE: Alinco and Yaesu radios only
provide +5V for the phantom voltage. This
can cause reduced output level in Icom and
Kenwood microphones that require +8V for
the phantom voltage.
Yaesu 8 Pin Round Radio
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