Related Manuals for MFJ hamproaudio MFJ-652
Summary of Contents for MFJ hamproaudio MFJ-652
- Page 1 Model MFJ-652 INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment MFJ ENTERPRISES, INC. 300 Industrial Park Road Starkville, MS 39759 USA Tel: 662-323-5869 Fax: 662-323-6551 COPYRIGHT 2005 MFJ ENTERPRISES, INC. VERSION 1A...
- Page 2 Customers using this manual should report errors omissions, recommendations for improvements, or other comments to MFJ Enterprises, 300 Industrial Park Road, Starkville, MS 39759. Phone: (662) 323-5869; FAX: (662) 323-6551. Business hours: M-F 8-4:30 CST.
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Page 3: Table Of Contents
INTERNAL HEADERS b. INTERNAL JUMPER BLOCK c. CABLES d. POWER e. HEADPHONES RADIO AUDIO 7. THEORY OF OPERATION 8. MFJ-652 EASY-START INSTRUCTIONS 9. IN CASE OF DIFFICULTY 10.TECHNICAL ASSISTANCE LIST OF FIGURES Figure 1 Front Panel Jacks and Controls Figure 2... -
Page 4: Introduction And Features
Audio Pass Through from your Radio: No need to switch the headphones from the MFJ-652 to the radio. At the push of a button you can instantly switch from normal operation to a test mode. This allows you to adjust the settings without going on the air with the built in monitor amplifier. -
Page 5: Typical Specifications
MFJ-652 hamProAudio Transmit Audio Equalizer Instruction & Technical Manual INTRODUCTION & FEATURES TYPICAL SPECIFICATIONS Input source……………………Dynamic or Electret mic low or high Z Stereo or Monaural radio audio. Sound card or Modem Output ………………………….Adjustable signal level. RJ-45 or 3.5 –mm Frequency Range……………..300, 600, 1200, 2400 Hz center... -
Page 6: System Controls
INPUT LEVEL OUTPUT LEVEL POWER MIC IN 10 11 Figure 1: MFJ-652 Front Panel Jacks and Controls 1. RJ-45 Microphone Input Jack: Accepts input from a Standard RJ-45 microphone. 8-Pin Microphone Input Jack: Accepts input from a standard 8 pin microphone. - Page 7 8. Auxiliary Input: This multifunction input allows for just about anything to be used with the MFJ-652. Use a Heil boom mic, The MFJ-393 Boom Mic Headset or even a computer microphone by setting the appropriate internal jumper.
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Page 8: System Setup
Instruction & Technical Manual SYSTEM SETUP INTERNAL HEADERS Figure 3: MFJ-652 Internal Headers 1. Header 1: This sets the input of the unit to your specific microphone. Default 1-2 is set to 500-1000 ohms, the standard impedance setting for most stock microphones. If you need low impedance then move the jumper to positions 3-4. -
Page 9: Internal Jumper Block
Refer to Table 1 for common microphones. Consult your owners’ manual to determine your specific microphone pinout. Figure 4: MFJ-652 Internal Jumper Blocks 1. Jumper 1: Pass/Thru. This allows you to pass any other lines from the microphone for feature such as up/down/fast. Normally all lines that are not being used for the Mic Audio, Mic Ground and PTT line will be jumpered. - Page 10 The Jumper Installation diagrams within this instruction manual will help you in setting up your MFJ-652 to match your radio. If your radio is not listed with the diagram, it means that we have not verified your radio to use that diagram. You can try to install jumpers as indicated.
- Page 11 If there are any Questions concerning the information provided, please refer to your RADIO INSTRUCTION MANUAL. MFJ is neither liable nor responsible for any mistakes or errors in the information provided. Receive Audio is taken from the Headphone Audio Output.
- Page 12 If there are any Questions concerning the information provided, please refer to your RADIO INSTRUCTION MANUAL. MFJ is neither liable nor responsible for any mistakes or errors in the information provided. Receive Audio is taken from the Headphone Audio Output.
- Page 13 If there are any Questions concerning the information provided, please refer to your RADIO INSTRUCTION MANUAL. MFJ is neither liable nor responsible for any mistakes or errors in the information provided. Receive Audio is taken from the Headphone Audio Output...
- Page 14 MFJ-652 hamProAudio Transmit Audio Equalizer Instruction & Technical Manual SYSTEM SETUP Radio Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Alinco DOWN AUDIO VOLTS Icom UP/DOWN AUDIO VOLTS Kenwood DOWN AUDIO VOLTS...
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Page 15: Cables
Simply connect your microphone to the appropriate input and use either a MFJ- 5398 for 8 pin Round or MFJ-5397MX for 8 pin Modular connector to the output on the rear of the unit and attach to your radio. . -
Page 16: Theory Of Operation
LEVEL Figure 11: Functional Diagram Figure 5 shows the functional diagram of the MFJ-652. Microphone audio is fed in through J2, J3 or J4. Header 1 sets the impedance for the specific microphone in use. From there the microphone audio is routed to U1A where it is amplified and routed to the equalizer section consisting of U2A-U2D. - Page 17 3. Set the From Radio/From 652 switch on the rear of the unit to the From 652 position. 4. Turn on the MFJ-652 and while speaking into the microphone adjust the monitor gain to a comfortable level. 5. While speaking into the microphone adjust the input level trim pot on the rear of the unit until the input led just illuminates on voice peaks.
- Page 18 MFJ-652 hamProAudio Transmit Audio Equalizer Instruction & Technical Manual EASY-START INSTRUCTIONS Some Results of Research on Speech Intelligibility in hearing English Words - The frequencies important for speech intelligibility are the consonant sounds from 500 to 4000 Hz. They contribute 83 % of word intelligibility.
- Page 19 MFJ-652 hamProAudio Transmit Audio Equalizer Instruction & Technical Manual EASY-START INSTRUCTIONS Adjusting your Transmit Audio Equalizer is based on three principles: First, reduce your speech energy below 500 Hz. These frequencies contribute only 4% of intelligibility but has 55% of the speech energy. Do this by turning the 300 and 600 Hz knobs fully counterclockwise.
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Page 20: In Case Of Difficulty
Ensure the Test/Operate switch on the rear of the unit is in the Operate position. [ ] Station PTT will not function: Check the PTT jumper block. Ensure that you have a ground between the radio and the MFJ-652 as the Mic Ground is isolated from the Chassis Ground. -
Page 21: Figure 12 Schematic
MFJ-652 hamProAudio Transmit Audio Equalizer Instruction & Technical Manual Figure 12: Schematic Schematic - 20 -... - Page 23 FULL 12-MONTH WARRANTY MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied.
- Page 24 MFJ-652 Manual 300 Industrial Park Road Version 1A Starkville, MS 39759 Printed In U.S.A.
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