MFJ MFJ-434B Instruction Manual

Text of MFJ MFJ-434B User Guide:

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 1 INTRODUCTION The MFJ-434B was designed by contesters and optimized to perform under the toughest operating conditions. You don't need to be a contest superstar to appreciate what the MFJ-434B can do. Even casual operators will discover the MFJ-434B is packed with user-friendly features that make operating, both in and out of contests, more enjoyable and fun. Set it up, and you'll be amazed how quickly it becomes part of your operating routine. Before you begin, pleas

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 2 Once again, this manual contains important technical information and operating instructions you'll need to know before using your keyer. Please read it thoroughly, and enjoy operating to the fullest! POWERING YOUR MFJ-434B Important Note : We recommend turning your radio on before powering up the voice keyer. When some transceivers are turned off, the PTT line may be held low.

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 3 IMPORTANT WARNING: Remove the 9-volt battery when storing the keyer for extended periods. Remember to reinstall the insulating sleeve on the snap clip. CONNECTING AND OPERATING THE MFJ-434B Front Panel: MFJ Voice Keyer POWERMIC XMIT VOLUME MESSAGES REPEAT DELAY ON STOP MSG 1 MSG 2 MSG 3 MSG 4 MSG 5 PLAYREC ONINT. EXT. INTERNAL MIC. EXTERNAL MIC. RECORD PLAY X10 X1 OFFOFF MFJ -43

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 4 Rear Panel: AUDIO OUT OUTPUT LEVEL CONTROL POWER 12VDC - + AUDIO IN STOP MSG1 MSG2 MSG3 MSG4 MSG5 /XMIT GND TO RADIO MIC. MFJ ENTERPRISES, INC. STARKVILLE, MS USA REMOTE Power Requires 9-16 Vdc @ 100mA Audio Out Monitor audio output, ~500 mW max Output Level Control Adjusts microphone output level to radio Audio In 600 Ohm input jack for recording external signals Remote Port Remote access to messages and transmit busy lines To Radio Mic Audio/PTT (RJ-45) output for radio&

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 5 IMPORTANT WARNING: The MFJ-434B's internal jumpers are factory set for compatibility with Yaesu transceivers (FT-817, FT-857, FT-897) using conventional dynamic or crystal microphones. When using Icom or Kenwood/Alinco products, internal jumpers must be reset for the correct manufacturer and microphone voltage. Microphone Jumper Configuration (Icom, Kenwood, Yaesu) 1. Disconnect any 12VDC source from the

• MFJ-434B Instruction Manual Voice Keyer 6 Front Panel View 87654321 8 7 6 3 4 5 2 1 3. JMP4 and JMP9 (Mic): Place jmp 4 and jmp 9 on the corresponding pin number required by your microphone. This pin number can be determined from the front panel view above. For example if your radio has Mic

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 7 IMPORTANT WARNING: Do not inadvertently change the jumper on HD1. This jumper is set on pins 7-8 and should not be moved. Other Internal Adjustments Please note two other important internal settings while the cover is off and the pc board visible: 1. Dual Gain Control, R29: This trimpot, located next to the audio isolation transformer, sets the overall adjustment range of the Output Level Control located on the rear panel. If you find the back panel gain contro

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 8 Remote message control lines are provided at the back panel via a male 8-pin IDC plug. This provides individual access to all five memory lines (MSG1-MSG5) plus the stop message line (Stop). All lines are isolated by a buffer, and are CMOS and TTL level compatible. A special output line provides 12 Vdc at low current when the voice keyer is not transmitting. This line goes logic low when the keyer transmits (Xmit), and can sink more than 20 mA. Another p

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 9 C. Off-Air or External Audio Source: Set Mic switch to Int and plug a line level audio source into the Audio In jack on the rear panel. Installing a plug in the Audio In jack disables the electret mic. Line level sources should not exceed 0-dBm. 4. Select A Message Slot: Choose from MSG1-MSG5 on the front panel. Press your selection and watch the Rec LED (it should flash within about two seconds). The first flash indicates recording has begun. To avoid recording "dead air", begin speaking the moment the red Rec LED starts flashing.

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 10 MSG1 MSG2 MSG3 MSG4 MSG5 075 Total Time in Seconds 32 42 52 62 32 10 10 10 13 Slot Size in Seconds This feature enables you to load up to a 75 second message in MSG1, should you need a long recording (progressively fewer slots are available as your message grows in length). When the memory limit is reached, the red Rec LED will stop blinking and the record function will stop automatically. With a little practice, you can use this protocol to extend your unit's flexibility. Message Playback Until

• MFJ-434B Instruction Manual Voice Keyer 11 C. Press any other MSG button to halt the current message and start a new one. 7. Adjusting the Output Level Control: Before attempting to transmit recordings on air, you must set the Output Level control on the back panel for your keyer. Begin by r

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 12 3. Press the following buttons in the sequence shown. The green LED should blink once per operation. STOP → GREEN MSG1 → GREEN MSG2 → GREEN MSG3 → GREEN MSG4 → GREEN MSG5 → GREEN X1/X10 → GREEN STOP (REMOTE) → GREEN MSG1 (REMOTE) → GREEN MSG2 (REMOTE) → GREEN MSG3 (REMOTE) → GREEN MSG4 (REMOTE) → GREEN MSG5 (REMOTE) → GREEN PTT → GREEN 4. Turn the Repeat Delay pot fully counter-clockwise, then fully clockwise. The green LED should blink onc

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 13 keyer. The shield of the 8 conductor cable is connected to both the switch box chassis and voice keyer chassis. Do not connect the shield to the signal ground at either end, or erratic operation may result. STOP MSG1 MSG2 MSG3 MSG4 MSG5 XMIT GND (signal) REMOTE BOX IDC PLUG Shield NC Computer Interface The MFJ-434 selects memories through a buffered CMOS or TLL compatible interface. While this interface is relatively immune to ground loops (it takes almost 3 V RMS ripple to

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 14 R1 R2 R3 R4 R5 R8 R9 R10 R11 R12 C2 C3 C4 C5 C6 Q2 Q3 Q4 Q5 Q6 Signal Ground Stop MSG1 MSG2 MSG3 MSG4 MSG5 Ground XMIT R7 C1 Q1 R6 Computer MEM1 MEM2 MEM3 MEM4 MEM5 Abort R1-R6 470 Ohm R7-R12 1 K C1-C6 .01 uF Q1-Q6 2N3904 Parts List Cable Shielded Voice Keyer Chassis Ground Multi-Conductor SW RET The following is a cross reference for NA software: NA ABORT STOP MEM (1-5) M

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 15 Distorted Recordings from Audio In Jack: Are levels from your audio source exceeding the keyer's 0-dBm maximum input rating? If so, they must be attenuated. Weak or Noisy Recordings from Audio In Jack: Are levels from your audio source below the -23 dBm minimum operating level? If so, they must be boosted in some way. Voice Keyer Won't Activate PTT line on Playback: Check XMIT switch position. Pre-recorded Message

• MFJ MFJ-434B, MFJ-434B Instruction Manual Voice Keyer 17 APPENDIX -At the MFJ factory, the interface is set for Yaesu transceivers with modular microphone connectors (FT-817, FT-857, FT-897). Y FT-897 FT-857 (modular) aesu FT-817 JMP 8 JMP 9 JMP 7 JMP 3 JMP 4 JMP 6 JMP 5 12 435687 JMP 2 Mic Mic Mic Gnd Mic Gnd PTT PTT PTT Gnd Direct Y (8-pin round) aesu FT-847 JMP 8 JMP 9 JMP 7 JMP 3 JMP 4 JMP 6 JMP 5 12 4 3568 7 JMP 2 Mic Mic Mic Gnd Mic Gnd

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