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Lectronics IFBT4-VHF Instruction Manual

Synthesized vhf ifb transmitter
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IFBT4-VHF
Synthesized VHF IFB Transmitter
Featuring Digital Hybrid Wireless
U.S. Patent 7,225,135
Fill in for your records:
Serial Number:
Purchase Date:
Technology
®
INSTRUCTION MANUAL
Rio Rancho, NM, USA
www.lectrosonics.com

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Summary of Contents for Lectronics IFBT4-VHF

  • Page 1 INSTRUCTION MANUAL IFBT4-VHF Synthesized VHF IFB Transmitter Featuring Digital Hybrid Wireless Technology ® U.S. Patent 7,225,135 Fill in for your records: Serial Number: Rio Rancho, NM, USA Purchase Date: www.lectrosonics.com...
  • Page 2 IFBT4-VHF LECTROSONICS, INC.

  • Page 3: Table Of Contents

    Synthesized VHF IFB Transmitter Table of Contents General Technical Description ..........4 Introduction .................4 Audio Input Interface ............4 Digital Hybrid Wireless Technology ........5 ® Audio Signal Processing .............5 Pilot Tone Squelch System ..........5 Frequency Agility..............5 Power Delay ................5 Microcontroller ..............5 Transmitter ................5 Antenna Port ...............5 Front Panel Controls and Functions ........6 IFBT4 Front Panel ...............6...

  • Page 4: General Technical Description

    BNC connector. that its action is hidden from the listener, but recovers slowly from sustained high levels to keep audio distor- tion low and preserve short term dynamic changes in the audio. IFBT4-VHF Transmitter Block Diagram Audio Input Interface Input Connector...

  • Page 5: Digital Hybrid Wireless ® Technology

    Synthesized VHF IFB Transmitter Digital Hybrid Wireless Technology Power Delay ® The design is based upon the patented Lectrosonics When powering the transmitter on and off, and when Digital Hybrid Wireless system.* While at the time of switching between the XMIT and TUNE modes, intel- ®...

  • Page 6: Front Panel Controls And Functions

    IFBT4-VHF Front Panel Controls and Functions IFBT4 Front Panel the Main window navigates to the Frequency window. The Frequency window displays the current operating frequency in MHz, as well as the standard Lectrosonics hex code. Also displayed is the UHF television channel to which the selected frequency belongs.

  • Page 7: Compat Setup Screen

    Synthesized VHF IFB Transmitter of a 4 pole lowpass digital filter. The 50 Hz setting is the default, and should be used whenever wind noise, HVAC rumble, traffic noise or other low frequency sounds may degrade the quality of the audio. The 35 Hz setting may be used in the absence of adverse conditions, for a fuller bass response.

  • Page 8: Rear Panel Controls And Functions

    IFBT4-VHF Rear Panel Controls and Functions IFBT4 Rear Panel Input Configuration (Mode Switches) The MODE switches allow the IFBT4 to accommodate a variety of input source levels by changing the input sensitivity and the pin functions of the input XLR jack.

  • Page 9: Frequency Selection

    Synthesized VHF IFB Transmitter Frequency Selection The R1A-VHF receiver provides two 16-position rotary The front panel LCD on the IFBT4-VHF transmitter switches to select the frequency, adjusted with a small displays frequency in MHz and in the two character screwdriver inserted in the slot in the middle of the hexadecimal method.

  • Page 10: Installation And Operation

    IFBT4-VHF Installation and Operation 10) Once the transmitter audio gain has been set, the 1) The IFBT4 transmitter is shipped with pin 1 of the receiver and other components of the system can XLR input connector tied directly to ground. If a be turned on and their audio levels adjusted.

  • Page 11: Accessories

    Synthesized VHF IFB Transmitter Accessories CH20 CH20 Power supply for IFB base transmitters with lock- ing LZR power jacks; 110 VAC input, 12 VDC regulated output; 400 mA max. A170AC VHF straight whip antenna; right angle BNC con- nector ARG15 ARG15 ARG25 A 15 foot antenna cable of standard RG-58 coax...

  • Page 12: Troubleshooting

    IFBT4-VHF Troubleshooting NOTE: Always ensure that the COMPAT (compatibility) setting is the same on both transmitter and receiver. A variety of different symptoms will occur if the settings do not match. Symptom: Possible Cause: Display Dead 1) External power supply disconnected or inadequate.

  • Page 13: Specifications

    Synthesized VHF IFB Transmitter Specifications Operating Frequencies (MHz): 174.100 to 215.750 MHz Power Requirements: 12 to 14 VDC typical, 200 ma. max.; Max. Input Range 6 to 18 VDC Available Frequencies: Power Input Jack: Coax type, locking LZR RL26AE Channel Spacing: 175 kHz Indicators: Backlit Liquid Crystal Display.

  • Page 14: Service And Repair

    IFBT4-VHF Service and Repair If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equip- ment needs repair. Make sure you have followed the setup procedure and operating instructions. Check the inter- connecting cables and then go through the Troubleshooting section in this manual.
  • Page 15 Synthesized VHF IFB Transmitter Rio Rancho, NM...

  • Page 16: Limited One Year Warranty

    LIMITED ONE YEAR WARRANTY The equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping.

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