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MFJ-432 Voice Memory Keyer 

MFJ-432 Voice Memory Keyer

 

 

Introduction 

The 

MFJ-432 Voice Memory Keyer

 will take you to new dimensions in the Contest 

world. Do poor band conditions leave you hoarse and frustrated? Not any more! By 
storing your own natural voice in the MFJ-432 

Voice Memory Keyer

, you can repeat the 

same message as many times as necessary. You can 

now

 operate most of a contest by just 

pressing a few buttons and still have your own voice when you're finished. 

The 

MFJ-432 Voice Memory Keyer

 is capable of storing as many as four natural 

sounding messages in a total of 20 seconds. It will also repeat stored messages 
continuously. A built in speaker allows you to monitor your stored messages. Internal 
jumpers let you customize your it to own rig. Contests have 

never

 been easier! 

Connections 

Power 

A 12 Vdc 300 milliamp power supply should be used with the MFJ-432.  The power jack 
accepts a 2.1mm coaxial plug with the center conductor positive.  An optional dc supply, 
the MFJ-1312B, is available from MFJ.  Connect your MFJ-1312B or compatible dc 
supply (coaxial line with shield ground) into the power jack on the MFJ-432. 

Radio and Microphone Connections 

This unit supports Icom, Kenwood, or Yaesu radios with 8 pin microphone connectors.  
Internal jumpers are used to set the unit for each make of radio.  The MFJ-432 is set for 
Kenwood at the factory.  Jumpers can be changed to the appropriate settings for Icom or 
Yaesu radios.  The unit should simply be open and the jumpers adjusted to the Y settings 
for Yaesu or the I settings for Icom.  The jumpers should be changed on both HD1 and J4. 

Output Level 

The audio output level to your radio may be adjusted using the trimpot labeled OUTPUT 
LEVEL CONTROL.  The control is accesible through a hole in the back panel.  A small 
slotted screwdriver can be used to adjust the trimpot. 

Audio In and Audio Out 

The AUDIO IN and AUDIO OUT jacks accept standard mono or stereo 3.5 mm 
miniature jacks.  The AUDIO OUT jack is driven differentially across the tip and the 
shield of the jack.  The AUDIO IN jack is used to record audio from your radio or other 
external source.  The AUDIO IN jack should have the audio on the tip and ground on the 
shield of the connector. 

 
 

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