MFJ -616 Instruction Manual
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MFJ -616 Instruction Manual

Speech intelligibility enhancer
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TM
MFJ-616 Speech Intelligibility Enhancer
Instruction Manual
INTRODUCTION
TM
The MFJ-616 Speech Intelligibility Enhancer
is a powerful communication tool that surrounds
your operating position with crystal-clear electronically-enhanced audio. It also puts the fun back
into ham radio! Here are some of the high-tech features we think you'll enjoy:
TM
Studio Quality: The Speech Intelligibility Enhancer
is designed to drive two identical high
quality speakers installed three or more feet apart. This configuration improves intelligibility,
enhances frequency response, and dramatically increases spatial presence. Once your system is
set up, you'll think you're in a broadcast studio!
TM
Speech Intelligibility Enhancer
:
Every radio has different audio characteristics--and
TM
everyone's hearing response changes over time. Our exclusive Speech Intelligibility Enhancer
tailors the sound of your radio especially for your ears. Young or old, you'll hear more clearly
than ever before!
Dual Amplifiers: Two powerful monolithic IC amplifiers deliver deep, rich, undistorted audio
to high quality, hi-fidelity speakers (not supplied).
Adjustable Balance: A front-panel Balance control aligns speakers for dead-center positioning
regardless of speaker placement or differences in ear sensitivity.
Easy-to-Operate: Large knobs, easy-to-access switches, and a wide-open panel layout make the
MFJ-616 very easy to set up and use.
Dual Input: Switch between radios with the push of a button--no messing with patch cables
behind the desk.
TM
By-Pass Function: Switch Speech Intelligibility Enhancer
in or out without cutting off the
speakers. This feature is especially helpful for sound comparisons during the frequency set-up.
Multiple Outputs:
Choose individual 3.5mm monaural jacks or a stereo jack wired for
computer-style speakers. Also, a front panel switch turns off your speakers, the stereo headset
stays active. Front panel phone jack is attenuated to headset levels (deactivated with internal
jumpers).
Multiple Power Sources: Use transceiver's 13.8-volt supply, wall adapter, dedicated supply, or
12-volt battery to power your unit.
Attractive all-metal cabinet, conservative component selection, and
Rugged Construction:
space-age SMD circuitry ensure solid performance for years to come. Fully covered by MFJ's
"No Matter What" one year limited warranty.
Before attempting to operate your MFJ-616, please read this manual thoroughly. It contains
important details you'll need to know to obtain the best performance from your unit.
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Summary of Contents for MFJ MFJ-616

  • Page 1 Attractive all-metal cabinet, conservative component selection, and Rugged Construction: space-age SMD circuitry ensure solid performance for years to come. Fully covered by MFJ's "No Matter What" one year limited warranty. Before attempting to operate your MFJ-616, please read this manual thoroughly. It contains...

  • Page 2: Jacks And Controls

    MFJ-616 Speech Intelligibility Enhancer Instruction Manual JACKS AND CONTROLS Front View: MFJ-616 Speech Intelligibility Enhancer Volume Balance 300 Hz 600 Hz 1200 Hz 2400 Hz Bypass Input A/B Speaker Phones Power Volume: Adjusts overall loudness of both channels. Balance: Establishes central balance between right and left speakers.

  • Page 3: Setup Instructions

    Power Sources: Power your unit from any stable 12-15 Vdc source capable of delivering 1.5 Amps--including 13.8-volt high-current transceiver supplies, smaller dedicated power sources, properly rated wall adapters, and 12-volt batteries. The MFJ-616 features supplemental internal filtering, but hum and noise may still occur if your source is under-rated or very poorly regulated.
  • Page 4 MFJ-616 Speech Intelligibility Enhancer Instruction Manual Radio Connections: The Speech Intelligibility Enhancer accepts signals in the "line-level" range from any of the following sources: 1. Auxiliary Jack: Many larger transceivers provide an Auxiliary Audio output jack on the back panel. This source may or may not be tied to the radio's volume control. Before using the auxiliary line, be sure to check your transceiver manual for specifications.
  • Page 5 MFJ-616 Speech Intelligibility Enhancer Instruction Manual 1. Initial Set-Up Levels: Begin by setting the Speech Intelligibility Enhancer controls as follows: Volume: 10:00 position (about 1/3 up). Balance: 12:00 position (mid-scale). Frequency Controls: Set all four for 12:00 position (mid-scale). Bypass: Speech Intelligibility Enhancer...
  • Page 6 MFJ-616 Speech Intelligibility Enhancer Instruction Manual How to adjust your Speech Intelligibility Enhancer for Maximum Speech Intelligibility There are four-frequency boost (increase in amplitude) and cut (decrease in amplitude) knobs spaced an octave apart in frequency. The center frequencies are approximately 300, 600, 1200 and 2400 Hz.

  • Page 7: Internal Settings

    MFJ-616 Speech Intelligibility Enhancer Instruction Manual INTERNAL SETTINGS The Speech Intelligibility Enhancer headphone circuit is normally attenuated to protect you against hearing injury due to an accidental high volume setting. If the sensitivity of your phones is unusually low, you may bypass the attenuators by removing the cabinet cover and installing shorting plugs on JMP4 and JMP5.

  • Page 8: Typical Specifications

    MFJ Technical Service at 662-323-0549 or the MFJ Factory at 662-323-5869. You will be best helped if you have your unit, manual and all information on your station handy so you can answer any questions the technicians may ask.
  • Page 9 MFJ-616 Speech Intelligibility Enhancer Instruction Manual SCHEMATIC...

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