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's microphone input
Ground Ground terminal to station's ground buss
Microphone Connections
IMPORTANT WARNING: Never connect more than one microphone at once to the the
MFJ-434B. Damage may occur to the voice keyer or other connected equipment.
The MFJ-434B comes with a standard 8 pin round microphone connector and a RJ-45 modular
connector located on the front panel. These are the same types used by most transceiver
manufacturers. Since manufacturers wire these 8 pin connectors differently, the MFJ-434B
provides a convenient jumper interface to program its connectors for use with different
transceivers. This feature eliminates the need for re-wiring jacks or adding adapter cables. At
the MFJ factory, the interface is set for Yaesu transceivers with modular microphone connectors
(FT-817, FT-857, FT-897). If you operate one of these Yaesu transceivers, you may disregard
this section and use your keyer without resetting the interface jumpers. Jumper configurations
for other Yaesu radios are also located in the appendix. If you use a radio made by a different
manufacturer, or different connector refer to the section below.
An internal jumper (J6) selects external microphone voltage. Some microphones require
external voltage to operate. This jumper supplies 0, 1.5, 5, or 8 volts.
To Next Page
Loading...