J-654 hamProAudio
TM
Microphone Equalizer/Conditioner
Instruction & Technical Manual
-7-
SYSTEM CONTROLS
OUTPUT
LEVEL
LED
MICROPHONE
OUT
MFJ ENTERPRISES, INC.
STARKVILLE, MS USA
POWER
12VDC
FROM MFJ-654
FROM RADIO
EXTERNAL
PTT
SWITCH
AUX.
AUDIO
OUTPUT
BALANCED
AUDIO
OUTPUT
AUX.
AUDIO
INPUT
RECEIVED
AUDIO
INPUT
OUT
HEADPHONE AUDIO
Figure 2: MFJ-654 Rear Panel Jacks and Controls
1.
Power:
Accepts 2.1 –mm power plug to supply 12-15 Vdc to the unit.
2.
From Radio/From MFJ-654:
This switch allows the audio to be fed from
the radio to the headphones or in the test mode for the audio from the
microphone to be fed to the headphones for setting the MFJ-654.
Additionally in the test mode the PTT is disabled allowing you to key the
microphone without keying the radio.
3.
Headphone Output:
Allows you to use a pair of 3.5 –mm stereo
headphones. The test audio is mono fed into both sides of the phones.
The radio audio is what your radio puts out. Handy if you have a Main and
a Sub-receiver.
4.
Headphone Ouput:
Same function as number 3 but for ¼ inch stereo
headphones.
5.
External PTT Input
: This
¼ inch jack allows PTT from a Hand Switch or
Foot Switch.
6.
Auxiliary Output:
This 3.5 –mm jack allows direct audio to be fed out
from the unit. Useful when high levels of audio are required as up to 1.2
volts peak to peak are available.
7.
Balanced Output:
This 3.5 –mm stereo jack give a balanced output.
8.
Output LED Level Set:
This trim pot is used to adjust the point at which
the LED illuminates.
9.
Auxiliary Input:
This multifunction input allows just about anything to be
used with the MFJ-654 by setting the appropriate input jumpers.
10.
RJ-45 Output:
This is where the MFJ-5398 or the MFJ-5397MX is
attached.
11.
Received Audio Input:
This jack allows either stereo or mono (if wired
properly) audio from your radio is applied.
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