Table of Contents
General Technical Description ..............................................................................................................................................................4
Introduction ...........................................................................................................................................................................................4
Digital Hybrid Technology......................................................................................................................................................................4
Audio Input Interface .............................................................................................................................................................................4
IFBT4 Transmitter Block Diagram ......................................................................................................................................................4
Input Limiter ..........................................................................................................................................................................................5
Audio DSP and Noise Reduction ..........................................................................................................................................................5
Pilot Tone Squelch System ...................................................................................................................................................................5
Frequency Agility...................................................................................................................................................................................5
Power Delay ..........................................................................................................................................................................................5
Microcontroller ......................................................................................................................................................................................5
Transmitter ............................................................................................................................................................................................5
Antenna System ....................................................................................................................................................................................5
Front Panel Controls and Functions .....................................................................................................................................................6
IFBT4 Front Panel .................................................................................................................................................................................6
OFF/TUNE/XMIT Switch .......................................................................................................................................................................6
Power Up Sequence .............................................................................................................................................................................6
Main Window .........................................................................................................................................................................................6
Frequency Window................................................................................................................................................................................6
Audio Input Gain Window ......................................................................................................................................................................6
Setup Window .......................................................................................................................................................................................6
ROLLOFF Setup Screen ...................................................................................................................................................................6
COMPAT Setup Screen .........................................................................................................................................................................7
TUNING Setup Screen .........................................................................................................................................................................7
IFBT4 Menu Diagram ............................................................................................................................................................................7
Rear Panel Controls and Functions ......................................................................................................................................................9
IFBT4 Rear Panel .................................................................................................................................................................................9
XLR Jack ...............................................................................................................................................................................................9
MODE Switches ....................................................................................................................................................................................9
Power Input Connector .........................................................................................................................................................................9
Antenna .................................................................................................................................................................................................9
Installation and Operation ...................................................................................................................................................................10
Operating Notes ....................................................................................................................................................................................11
Accessories ..........................................................................................................................................................................................11
Troubleshooting ....................................................................................................................................................................................12
Frequency Blocks and Ranges ...........................................................................................................................................................13
Specifications .......................................................................................................................................................................................14
Service and Repair ...............................................................................................................................................................................15
Returning Units for Repair ..................................................................................................................................................................15
Rio Rancho, NM
Multi-Frequency IFB Transmitter
3
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