INSTRUCTION MANUAL H187 VHF Narrowband Plug-On Transmitter • • • • Crystal Controlled Fixed Frequency Wide Range Input Limiting Floating, Auto Latching Input Coupler Machined Aluminum Construction Fill in for your records: Serial Number: Purchase Date: Rio Rancho, NM, USA www.lectrosonics.
H187 The H187 transmitter is FCC type accepted under Part 90 (150-172 MHz), and Part 74 (174-216 MHz) 2 LECTROSONICS, INC.
Plug-On Transmitter Table of Contents Introduction ............................................................................................................................................................................................ 3 General Technical Description .............................................................................................................................................................. 3 H187 Block Diagram ...........................................................
H187 Introduction found on hand held and shotgun microphones. Thank you for selecting Lectrosonics wireless. This VHF transmitter is part of a family of narrowband wireless components that have served the needs of television broadcast and motion picture production markets since 1988. The housing and external mechanical parts are constructed of machined aluminum to provide the ruggedness needed in field production.
Plug-On Transmitter Controls and Functions The H187 may be used with a wide variety of microphones. The 3-pin XLR type connector on the H187 allows the transmitter to be used with any dynamic microphone, as well as many two wire positive bias lavaliere systems (such as those systems supplied by Lectrosonics.) Input Jack Standard 3-pin Switchcraft XLR type. Pin 2 is signal, pin 3 is signal ground, and pin 1 is case ground (see schematic below). The H187 is self-locking onto a standard microphone.
H187 Operating Instructions 1) Insert the H187 into the selected microphone. Listen for the “click” that indicates the H187 has locked on to the microphone. Pull on the mic to insure proper locking has occurred. 2) Turn the power switch to the “MUTE” position on both the transmitter and the receiver. The “MUTE” position allows internal voltages to stabilize before audio signal paths are opened. 3) Hold the microphone as you will when you will be using it.
Plug-On Transmitter Battery Replacement The H187 transmitter is powered by a standard alkaline 9 Volt battery. It is important that you use ONLY an ALKALINE battery for longest life. Standard zinccarbon batteries marked “heavy duty” or “long-lasting” are not adequate. They will provide only about 4 hours of operation. Similarly, nicad rechargeable batteries only give 4 hours of operation, and will also run down quite abruptly. Alkaline batteries provide about 15 hours of operation.
H187 Troubleshooting Before going through the following chart, be sure that you have a good battery in the transmitter - the red power LED on the transmitter panel should glow brightly. Symptom Possible Cause Transmitter Battery LED Off 1) Battery is inserted backwards. 2) Battery is dead. No Transmitter Modulation LEDs 1) Gain control turned all the way down. 2) Battery is in backwards. Check power LED. 3) Mic capsule is damaged or malfunctioning.
Plug-On Transmitter Service and Repair If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnecting cables and then go through the Troubleshooting section in this manual. We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt anything other than the simplest repair.
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. This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any defective parts without charge for either parts or labor.
