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MFJ-432 Voice Memory Keyer 

Accessory Circuits 

Many circuits can be added to the accessory port to implement different functions.  Each 
message line is available on this port along with +5 Vdc.  The message line must be 
asserted high, to 5 Vdc, in order to play a message. 

 

Implementing a Remote: 

One of the simplest circuits to implement for the Voice keyer 
is a remote.  A remote requires 4 momentary contact SPST 
switches, a length of 5 conductor cable, a 5 pin IDC connector 
and a small box to hold the switches. 

 

 

 

Battery Installation and Removal 

This unit can be used with a 9 volt battery for mobile operation.  Remove the cover to 
begin battery installation.  Slide the plastic battery clip insulator down on the wire and 
install the battery.  Press the battery into the battery holder and replace the cover.  

Technical Assistance 

If you have any problem with this unit first check the appropriate section of this manual. 
If the manual does not reference your problem or your problem is not solved by reading 
the manual, you may call 

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. 

 

You can also send questions by mail to MFJ Enterprises, INC., 300 Industrial Park Road, 
Starkville, MS 39759; by FAX to 601-323-6551; through Compuserve at 76206,1763; or 
by email to [email protected].  Send a complete description of your 
problem, an explanation of exactly how you are using your unit, and a complete 
description of your station. 

 

 

 

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