MFJ MFJ-432 Bedienungsanleitung

MFJ-432 Voice Memory Keyer

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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.

MFJ-432 Voice Memory Keyer

Accessory Port

Beside the audio in jack is a connector for a IDC plug. Each message line plus 5 volts out

is available on this port. This plug can be used to implement a remote or other accessory

circuits. See the section entitled "Accessory Circuits" for more details.

Basic Operation

The Voice Keyer is simple to operate. The push-button marked PWR controls power to

the unit. After turning the unit on, either the PLAY or the REC LED should light.

MFJ-432 Voice Memory Keyer

Recording a message

Push the RECORD PLAY button. The REC LED should light. Press and hold the

appropriate message button while speaking into the microphone. Release the message

button when the message is complete. Pressing the PTT switch is unnecessary if using a

microphone connected in the EXTERNAL MIC jack. The radio will be keyed and the

message will be transmitted over the air if the PTT switch is pressed.

Re-recording the message replaces an existing message. A re-recorded message will

erase any messages that it overruns. See the section entitled Message Memories for more

detailed information.

A feature allowing immediate cancellation of an outgoing message can be installed. This

is accomplished by programming memory 4, and using it as a "cancel" button.

To use memory four as a cancel OGM (out going message) button:

1.) Place the Voice Keyer in the record mode.

2.) Briefly tap memory button four.

3.) Release the record button.

This action records a very short burst of no audio in position 4. If the operator is playing

any other memory, he or she can immediately silence the VK by tapping memory button

four.

Note: Tapping four to cancel will not stop the automatic repeat function of message one.

Memory four will cancel the immediate memory one auto-repeat transmission, but

the auto-repeat button must be released to prevent VK from trying to repeat

message after the normal cycle time elapses.

Playing a message

Push the RECORD/PLAY button until the PLAY LED is lit. Press the correct message

button to play a message. The XMIT button in the outward position allows the user to

listen to a message without transmitting it. Press and lock the REPEAT MSG 1 button to

repeat message 1. The MFJ-432 will play message 1 once and then start transmitting it

over the air until the REPEAT MSG 1 button is released to the "out" position. To change

the delay time, a trimpot, labeled REPEAT DELAY, is accessible through a hole in the

back panel. A small slotted screwdriver can be used to adjust the trimpot.

MFJ-432 Voice Memory Keyer

Message Memories

The message space is a continuous block of audio memory. This large block is divided

into 4 message memories. Memory 1 starts at 0 seconds. Memory 2 starts at 8 seconds.

Memory 3 starts at 12 seconds. Memory 4 starts at 16 seconds. Each section of memory

can only contain 1 messages' audio. Messages of 8, 4, 4, and 4 seconds long will

optimize usage of available memory.

Message 1 may be as long as 20 seconds, but because only one message can be in a

memory block, the other messages would contain portions of message 1 if this message

was longer than 8 seconds. If message 4 is recorded longer than 4 seconds, all audio over

4 seconds will be lost.

Suppose a message is saved in message 1 for 11 seconds. Message 2 starts at the 8

second point so it contains a 3-second part of message 1. Message 2 will be unusable

unless the audio saved after 8 seconds is an independent message.

If message 2 is re-recorded, it would write over the portion of message 1 in message 2's

memory area. This new message would also write over the end flag for message 1.

Message 1 would then play for 8 seconds and then play all of message 2. See the diagram

below.

Looping

Message 1 is the only message that will repeat. The length of the pause between loops in

message 1 may be adjusted using the trimpot accessed through the hole labeled REPEAT

DELAY on the back panel. A small slotted screwdriver can be used to adjust the trimpot.

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.

MFJ-432 Voice Memory Keyer

Schematic

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