MFJ hamProAudio MFJ-654, Инструкция по эксплуатации

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J-654 hamProAudio
TM
Microphone Equalizer/Conditioner Instruction & Technical Manual
-8-
SYSTEM SETUP
INTERNAL HEADERS
Figure 3: Internal Headers
1. Header 1: This sets the input of the unit to your specific microphone. Default 1-2 is set
to 680 ohms the standard impedance setting for most stock microphones. If you need
low impedance then move the jumper to positions 3-4. Remove for high impedance
microphones.
2. Header 3: This allows the PTT line to be placed on the ring of the 3.5 –mm auxiliary
input jack. Default is off.
3. Header 4: This header allows phantom voltage to be fed to electret microphones
Default is 0 volts pins 1-2 shorted. Move this jumper to pins 3-4 for 1.5 volts, 5-6 for 5
volts or 7-8 for 8 volts.
4. Header 5: High impedance output. Default is shorted for low impedance output but if
required remove this jumper for approximately 50K output impedance.
5. Header 6: This header allows the phantom voltage set by header 4 to be passed to the
ring of the Auxiliary input jack. Default is off. If used with standard computer
microphone/headphones set to 5 volts.
6. Header 7: This header ties the CT of the output transformer allowing a balance output
to be available at the 3.5 –mm jack. Default is off.
7. Header 8: This header allows the PTT line to be placed on the Auxiliary Output ring
terminal of the 3.5 –mm jack. Default is off.
8. Header 9: This Header places phantom voltage on the microphone input line and the tip
of the 3.5 mm input jack. It must be shorted when using a microphone requiring phantom
voltage.
9. Header 10: This header allows the transformer to be bypassed to increase the low
frequency response. Default is 1-2 not bypassed.
10. Header 11: This header allows the transformer to be bypassed to increase the low
frequency response. Default is 1-2 not bypassed.
11. Header 12: This header grounds the Mic Ground to the radio and must be shorted if the
transformer is being bypassed. Default is off.