Lectrosonics H187 Bedienungsanleitung

ÿ3ÿ

Wide Range Limiting

ÿ3ÿ

Surface Mount Technology

H187

PLUG-ON TRANSMITTER

LECTROSONICS, INC.

Rio Rancho, NM

www.lectrosonics.com

OPERATING INSTRUCTIONS

and trouble-shooting guide

TABLE OF CONTENTS

INTRODUCTION .................................................................................................. 2

GENERAL TECHNICAL DESCRIPTION ............................................................ 3

INSTALLATION ..................................................................................................... 4

FRONT PANEL DESCRIPTION........................................................................... 5

REAR PANEL DESCRIPTION ............................................................................. 6

OPERATING INSTRUCTIONS ............................................................................ 8

REMOTE LEVEL CONNECTIONS ...................................................................... 9

TROUBLESHOOTING ......................................................................................... 9

SERVICE AND REPAIR ..................................................................................... 10

RETURNING UNITS FOR REPAIR ................................................................... 10

SPECIFICATIONS .............................................................................................. 11

APPENDIX 1: SERIAL PORT HARDWARE AND SOFTWARE ....................... 12

SERIAL PORT COMMANDS AVAILABLE ........................................................ 13

WARRANTY ......................................................................................... Back cover

INTRODUCTION

Thank you for selecting the Lectrosonics Professional Series wireless microphone

system.

This system represents well over 10 years of manufacturing experience in wireless

microphones, and almost 70 years of design experience. It is the best value avail-

able today. You will find that the H187 radiates more power than other standard

handheld wireless microphones. This provides both greater operational range, as

well as improved signal-to-noise ratio. In addition, the frequency response of the

H187 is flat to 18kHz. This guarantees that the performance of any microphone you

choose will not be degraded by the H187.

If you are new to wireless microphones, you will discover a new freedom of move-

ment and convenience. If you are an experienced wireless user, you will be pleas-

antly surprised with the effortless, quiet performance of the Lectrosonics

Professional Series design. Over time, you will appreciate the rugged dependability

of the H187. Superior mechanical design and construction mean years of trouble-

free use.

Only the H187 transmitter is covered in this manual. A matched transmitter/receiver

combination makes up a “system.” Receivers are explained in separate manuals.

The H187 transmitter is constructed of metal and operates on interference-free high

band frequencies from 150MHz to 216MHz. Since the H187 uses the actual micro-

phone case as an antenna, there is no need for any unsightly extra wires. The H187

plugs into the XLR jack of any hand-held microphone, giving the user the greatest

choice of mics.

The H187 transmitter is FCC type accepted under Part 90 (150-172 MHz), and Part 74 (174-216 MHz)

Plug-on Transmitter

Rio Rancho, NM – USA

GENERAL TECHNICAL DESCRIPTION

The H187 transmitter is comprised of four major functional subsystems: the mic preamp/gain control, the compandor,

the compressor/limiter and the RF transmitter (see block diagram below).

The mic preamp is an ultra-low noise type op-amp. Aside from gain control, this stage also adds high frequency pre-

emphasis to the audio signal. This insures highest signal-to-noise ratios under varying signal conditions. Gain

control is semi-logarithmic to provide smooth gain control action.

The compandor is a high quality audio device that processes the input signal such that large dynamic ranges of input

signal can be transmitted to the receiver without overload or noise. A complementary system in the receiver recovers

the original dynamics of the signal for full audio quality. Compression and expansion ratios are complementary at 2:1.

High frequency pre-emphasis is implemented in the transmitter to provide another 10dB signal-to-noise ratio improve-

ment. Matching de-emphasis is provided in all receivers.

The compressor/limiter is a low distortion shunt FET compressor. Control signals for the compressor are derived

after the compandor to eliminate any possibility of overload under any signal condition up to a maximum of 3 Volts

input. The range of limiting action before gross distortion occurs is 35dB.

The compandor in the 187 series transmitters is much tighter than the 185 series. The H187 compandor will hold the

transmitter deviation to no more than ±15kHz under all circumstances. The 185 compandor would allow some

excursions beyond 15kHz during strong audio “spikes.”

The RF transmitter is composed of the crystal stabilized main oscillator followed by a frequency tripler and two

frequency doublers. All three stages are double tuned. Double tuning provides maximum attenuation of spurious

signals, which in turn minimizes the possibility that a transmitter would interfere with another transmitter/receiver

system on another frequency.

All RF stages are biased from a regulated internal source. The output stage has a separate feedback regulator which

not only stabilizes its operating point, but also minimizes AM distortion. These regulators keep the RF performance

consistent from the beginning (9 Volts) to the end (6.5 Volts) of battery life.

Schematics and alignment instructions will be provided to qualified repair personnel on request.

OUT

INPUT

LIMIT LED

LEVEL LED

COMPANDOR

45MHZ 90MHZ 180

MHZ

+9V IN

LIMITER

35 dB

MIC

PREAMP

BATTERY

SENSOR

CIRCUIT

POWER

LED

15MHZ XTAL

OSCILLATOR

(VCO)

FREQ.

TRIPLER

FREQ.

DOUBLER

FREQ.

DOUBLER

VOLTAGE

REGULATOR

FEEDBACK

REGULATOR

MIC LEVEL

XLR

H187 Block Diagram

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 lavalier 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. The XLR connector is permanently bonded to the

metal collar, and is not normally replaceable. The electret bias is 5 Volts at 1mA or less. The bias is connected in a

“phantom”manner and will not interfere with any standard balanced microphone. If severe noise is experienced when

the microphone is moved with respect to the H187, the cause is an unbalanced condition between pins 2 and 3 of the

microphone.

Input Jack Schematic

POWER/MUTE SWITCH

Turns the battery power on and off. The center position is an “audio mute”which should be used when setting the

MIC LEVEL control. The “mute”position disconnects the audio signal from the transmitter and allows you to adjust

the audio modulation level without the possibility of feedback. When turning the transmitter on, pause for a moment in

the “mute”position. This will prevent a turn-on surge from occurring (a “thump”sound).

POWER ON/OFF LED

Glows brightly when battery is good. A weak or dim LED means that the battery is weak, and has about an hour of

operation left. If the LED fails to light, the battery should be replaced. The power LED should light up in both the

“mute”and “on”positions of the POWER/MUTE SWITCH.

The POWER LED is connected to a precision battery test circuit that continuously monitors battery voltage. The LED

is at full brightness with a new 9 Volt alkaline. As the battery voltage drops during use, the LED brightness will also

decrease. After 12 to 15 hours the battery voltage will be about 7 Volts. The LED will be completely extinguished.

Since the internal circuits are all tightly regulated and the RF output stage has a separate discrete regulator, the

transmitter will continue to operate to a battery voltage of 6.5 Volts. From 6.5 Volts to 6 Volts, the transmitter will still

operate, but with degraded performance. Please note that a weak battery will sometimes light the POWER LED

immediately after turn on, but soon will discharge to the point where the LED will extinguish.

The combination of an accurate battery condition indicator and regulation of all internal circuits guarantees much

longer battery life, as well as consistent performance versus battery life.

1 UH

1K 1K 980

+9 VOLTS

33UF 5.1V

TO MIC

PREAMP

AUTO-LOCK

XLR INPUT

1 UH

Plug-on Transmitter

Rio Rancho, NM – USA

MODULATION LEDS

Indicate the proper setting of the MIC LEVEL control.

LEVEL LED

Flickers or glows all the time if the audio volume is adequate for normal operation.

LIMIT LED

Lights up when the audio volume is high, indicating that the signal level is being limited by the compressor. Optimum

signal-to-noise ratio is obtained when the limit LED lights occasionally.

MIC LEVEL

Used to adjust the audio input volume for the proper modulation level. Rotate knob until the LEVEL LED flickers

when there is an input signal. The LIMIT LED should light occasionally.

TOP VIEW CONTROL PANEL

LIMIT LED

LEVEL LED

OFF

LEVEL

MUTE

BATTERY

POWER

LED

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.

4) Speak as loudly as you expect to speak in normal system use. Rotate the MIC LEVEL knob so that the LEVEL

LED flickers or stays lit as you speak. The LIMIT LED should light up on loud “peaks.”

Occasional lighting of the

LIMIT LED (about 10-15% of the time) indicates proper operation and optimum signal-to-noise ratio.

Even when the

transmitter is limiting, little distortion is produced because of the high linearity of the gain control circuit in the H187.

5) Move switches to “ON”position on both the transmitter and the receiver and adjust the volume of the sound system.

NOTE:

The MIC LEVEL control should not be used to control the volume of your sound system. This is accomplished using

the level control on the receiver, or a level control on the mixing console.

If the mic level is too high —the LIMIT LED will light frequently or stay on. This condition may cause distortion.

If the mic level is too low —neither LED will light, or the LEVEL LED will light dimly. This condition will cause hiss

and noise. You may experience severe reduction in apparent range if the modulation level is too low. It may sound as

if you are getting dropouts. What is actually happening is that you are hitting your noise floor because the S/N ratio

has been compromised by the low modulation.

The LEVEL LED turns on at -10dB below full deviation. The LIMIT LED turns on at full deviation and indicates that

the input shunt compressor is operating. The input compressor operates over a full 35dB range regardless of the

gain control setting. The compressor uses a true absolute value circuit to detect both positive and negative peaks.

The attack time is 2 milliseconds and the release time is 80 milliseconds. Occasional limiting is desirable, indicating

that the gain is correctly set and the transmitter is fully modulated.

TO ATTACH

TO REMOVE

Pull on mic to insure locking.

Press firmly, listen for click.

Depress collor fully.

Hold the transmitter

case and rotate the

collar in the direction

shown. Do this over

a soft surface as the

microphone may pop

off suddenly.

Plug-on Transmitter

Rio Rancho, NM –USA

BATTERY REPLACEMENT

The H187 transmitter is powered by a standard alkaline 9 Volt battery. It is important that you use ONLY an ALKA-

LINE battery for longest life. Standard zinc-carbon 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 opera-

tion, and will also run down quite abruptly. Alkaline batteries provide about 15 hours of operation.

To open the battery compartment, press outward on the cover door in the direction of the arrow as shown in the

drawing. Only slight, sliding pressure is needed to open and close the battery door.

Swing the door open and take note of the polarity marked inside showing the location of the positive (+) and negative

(-) terminals. Insert the battery and close the cover by pressing in and across, reversing the opening procedure

outlined above. Note that the battery door will NOT close if the battery is inserted incorrectly, since the terminals will

hit a protective polarity barrier.

SPECIFICATIONS AND FEATURES

Operating frequencies: 150 to 216 MHz

RF Power output: 50mW

Deviation: ±15kHz

Spurious radiation: 55dB below carrier

Equivalent input noise: -126dBV

Input level: Nominal 2mV to 300mV (before compression)

Input impedance: 22k Ohms (compatible with all Lo-Z microphones)

Input compressor: Soft compressor, 35 dB range allows 3 Volt max. input

Gain control range: 43dB; semi-log rotary control

Modulation indicators: Dual LEDs indicate modulation level and onset of limiting

Controls: 3 position “OFF-MUTE-ON”for noiseless operation;

rotary knob adjusts audio gain

Connector: 3-pin XLR type with auto-locking collar

Battery: Any 9 Volt alkaline battery

Weight: 7 ozs. including battery

Dimensions: 1.5 x 1.5 x 4.2 inches

Emission Designator: 54KOF3E

Specifications subject to change without notice.

SWING OPEN

RELEASE

DOOR

OBSERVE

POLARITY

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.

NO SOUND IS HEARD AND 1) Transmitter not turned on.

RECEIVER RF LAMP IS OFF 2) Transmitter battery is dead.

3) Receiver antenna missing or improperly positioned.

4) Transmitter and receiver not on same frequency. Check labels on

transmitter and receiver.

5) Operating range is too great.

NO AUDIO IS HEARD BUT RECEIVER 1) On/Off switch is in “mute”position

RF LED IS ON receiver or transmitter.

2) Microphone on/off switch is in “off”position.

NOTE: If the modulation level 3) Volume is turned down or off on

LEDs on the receiver are transmitter or receiver.

indicating properly, the problem 4) Receiver not properly connected to

is NOT in the transmitter. other audio equipment.

5) Transmitter POWER switch may be turned on and off (i.e. through

the mute position). A “thump”should be heard in the sound, again

indicating a properly functioning receiver.

NO SOUND AND RECEIVER 1) Transmitter audio muted. Make sure front panel power

MOD LEVEL LEDs ARE OFF switch is in the on position.

NO SOUND BUT RECEIVER 1) Receiver audio is muted. Refer to receiver manual.

MOD LEVEL LEDs ARE ON 2) Receiver audio output is disconnected or cable is defective or

mis-wired.

3) Sound system or recorder input is turned down.

NOISE (HISS) IS HEARD ALONG 1) MIC LEVEL is too low.

WITH THE SIGNAL 2) Transmitter and receiver may be too far from one another.

3) Receiver antenna may be defective or disconnected.

DISTORTED SOUND 1) MIC LEVEL is too high.

2) Mic may be distorting; try a different mic and listen again.

3) PA system may be overloading.

EXCESSIVE FEEDBACK 1) Transmitter gain (audio level) too high. Check gain adjustment

and/or reduce receiver output level.

2) Microphone too close to speaker system.

3) Microphone too far from user’s mouth.

4) Sound system volume set too high.

Plug-on Transmitter

Rio Rancho, NM –USA

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 out the intercon-

necting cords and then go through the TROUBLE SHOOTING section in the 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. If the repair is more complicated than a broken wire or loose connec-

tion, send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units. Once set

at the factory, the various controls and trimmers do not drift with age or vibration and never require readjustment.

There are no adjustments inside that will make a malfunctioning unit start working.

LECTROSONICS’service department is equipped and staffed to quickly repair your equipment. In warranty repairs

are made at no charge in accordance with the terms of the warranty. Out of warranty repairs are charged at a modest

flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does

to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone

for out of warranty repairs.

RETURNING UNITS FOR REPAIR

You will save yourself time and trouble if you will follow the steps below:

A. DO NOT return equipment to the factory for repair without first contacting us by letter or by phone. We need to

know the nature of the problem, the model number and the serial number of the equipment. We also need a phone

number where you can be reached 8 am to 4 pm (Mountain Standard Time).

B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed

your repair through our receiving and repair departments. The return authorization number must be clearly shown on

the outside of the shipping container.

C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the

proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed”for

safe transport.

D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or damage

to equipment that you ship. Of course, we insure the equipment when we ship it back to you.

Mailing address: Shipping address: Telephones:

Lectrosonics, Inc. Lectrosonics, Inc. Regular: (505) 892-4501

PO Box 15900 581 Laser Rd. Toll Free (800) 821-1121

Rio Rancho, NM 87174 Rio Rancho, NM 87124 FAX: (505) 892-6243

USA USA

World Wide Web: http://www.lectrosonics.com Email: sales@lectrosonics.com

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. If Lectrosonics, Inc. cannot

correct the defect in your equipment, it will be replaced at no charge with a similar new

item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.

This warranty applies only to items returned to Lectrosonics, Inc. or an authorized

dealer, shipping costs prepaid, within one year from the date of purchase.

This Limited Warranty is governed by the laws of the State of New Mexico. It states the

entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any

breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR

ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT

SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL,

OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE

THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE

POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF

LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE

EQUIPMENT.

This warranty gives you specific legal rights. You may have additional legal rights which

vary from state to state.

LECTROSONICS, INC.

581 LASER ROAD

RIO RANCHO, NM 87124 USA

November 1, 2001

LIMITED ONE YEAR WARRANTY

Andere Handbücher für H187

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