MFJ MFJ-662 User Manual
Table of Contents
Introduction..........................................................................................................1
How Your MFJ-662 Simplex Repeater Works.....................................................1
Jacks and Controls................................................................................................2
Specifications.......................................................................................................2
Power Sources......................................................................................................3
Interface Connections...........................................................................................4
Set-up Testing and Operation...............................................................................4
Selecting a PTT Interface.....................................................................................6
Record Level........................................................................................................6
Transmit Level.....................................................................................................7
Simplex Repeater Operating Tips.........................................................................7
Repeater Set-Up Suggestions ...............................................................................8
Theory of Operation.............................................................................................9
In Case of Difficulty............................................................................................. 9
Technical Assistance..........................................................................................10
Schematic...........................................................................................................11
MFJ-662 Instruction Manual Simplex Pocket Repeater
INTRODUCTION
Congratulations on purchasing the MFJ-662 Simplex Pocket Repeater. This
small unit houses everything you need to turn your HT, mobile, or base-station
radio into a range-extending simplex repeater system. The MFJ-662 may be
small, but it's loaded with high-tech features:
32-Second Memory: Captures your entire message with time to spare.
PIC Controller: Reliable PIC technology manages each function flawlessly.
Adjustable Gain: Programmable transmit level ensures best audio quality.
Selectable PTT Interface: Keys load-sensing or ground-contact PTT circuits.
Small Size: Ultra-compact pocket-sized case fits anywhere.
Flexible Power: Uses single 9V battery or any external 9-15 Vdc source.
Versatile Interface: Open-ended patch cable adapts to virtually any radio.
Courtesy Tone: Controller signals the end of repeated messages.
HOW YOUR MFJ-662 SIMPLEX REPEATER WORKS
Repeater stations extend communication range beyond line-of-sight by
intercepting and re-transmitting signals from a favorable location. Repeaters
may be either duplex or simplex in design. Most Hams are more familiar with
the sophisticated duplex systems set up by repeater groups to expand mobile
communication. These repeaters occupy two channels, one for listening and one
for simultaneously re-transmitting. Duplexing offers the convenience of realtime conversation, but the hardware is generally too large and complex to move
around for portable use.
Tower
1
Station
Antenna
duplexer
Duplex Repeater Station
Receiver
Control
Controller
Transmitter
Amplifier
Power
Supply
Link
Autopatch
Simplex Repeater Station
Telco
Line
MFJ-662
Simplex
Controller
Rock
Portable
HT
MFJ-662 Instruction Manual Simplex Pocket Repeater
Unlike duplex systems, simplex repeaters require only a portable transceiver and
a self-powered controller such as your MFJ-662. They occupy a single channel
and use solid-state voice-memory to record and then repeat each incoming
transmission. Simplex repeaters are especially useful for increasing the range of
hand-held HTs and mobile units participating in field activities such as races,
missing-person searches, hunting trips, disaster communication, and special
events. All you need is an accessible elevated location and a minute or two of
time to place your repeater in service.
JACKS AND CONTROLS
3
Rec
RADIO
INTERFACE
1
1. Interface Jack: Accepts 5-pin IDC plug for Mic, Record Audio, PTT lines
and ground.
2. Record Indicator: LED illuminates when controller is recording.
PWR
2
MFJ-662
4
3. Power Off/On: Applies power to controller from internal battery or external
jack.
4. External Power: Accepts 2.1-mm plug (9-15 Vdc source), disconnects
battery.
SPECIFICATIONS
Power Source .......................... 9V battery or 9-15 Vdc supply
Current Drain .......................... 3.5 mA Standby
PTT Mode .............................. Selectable (ground-contact or load-sensing)
Voice Memory ........................ 32 Seconds total storage
Dimensions ............................. 2.3" x 1" x 3.7"
Weight .................................... ≈2 oz.
2
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