UH100
UHF MULTI-FREQUENCY
PLUG-ON TRANSMITTER
OPERATING INSTRUCTIONS
and trouble-shooting guide
LECTROSONICS, INC.
Rio Rancho, NM
http://www.lectrosonics.com
INTRODUCTION
Thank you for selecting the Lectrosonics UH100 frequency agile, plug-on transmitter. The
UH100 combines over 80 years of engineering experience with the very latest components, in a
design that addresses the most demanding professional applications.
The design of the UH100 was the direct result of numerous conversations with users, staging
and touring companies and dealers across the US. The specific concerns and needs brought up
in these conversations led directly to the development of the operational features offered on the
UH100. Two hundred fifty six frequencies are user selectable in 100kHz steps to alleviate
interference problems in travelling venues.
The UH100 is a rugged, machined aluminum package. Phantom power is provided on pins 2
and 3. Level indicating LEDs are provided to make level settings quick and accurate, without
having to view the receiver. The battery compartment accepts any 9 Volt alkaline or lithium
battery and makes a positive connection via self-adjusting contacts.
Only the UH100 transmitter is covered in this manual. Companion receivers are covered in
separate manuals. The UH100 will operate with any 100 or 105 Series Lectrosonics receiver in
the same frequency group.
TABLE OF CONTENTS
INTRODUCTION .....................................................................................................2
GENERAL TECHNICAL DESCRIPTION ................................................................3
CONTROLS AND FUNCTIONS ..............................................................................4
OPERATING INSTRUCTIONS ...............................................................................5
OPERATING NOTES .............................................................................................. 5
ADJUSTING THE TRANSMITTER FREQUENCY .................................................5
TROUBLESHOOTING ............................................................................................ 6
BATTERY REPLACEMENT ....................................................................................6
SPECIFICATIONS AND FEATURES ..................................................................... 8
SERVICE AND REPAIR ..........................................................................................9
RETURNING UNITS FOR REPAIR ........................................................................9
WARRANTY ........................................................................................... Back cover
The UH100 transmitter is FCC type accepted under Part 74: 470 - 608MHz and 614 - 806MHz
2
UHF Multi-frequency Plug-on Transmitter
GENERAL TECHNICAL DESCRIPTION
The UH100 transmitters are comprised of a number of functional
sub-systems as shown in the block diagram below.
GENERAL
The 100 system uses 20kHz wide deviation for a high signal to
noise ratio. The transmitter circuits are all regulated to allow full
output power from the beginning (9 Volts) to the end (6.5 Volts)
of battery life. The input amplifier uses an ultra low noise op
amp. It is gain controlled with a wide range input compressor
which cleanly limits input signal peaks over 30dB above full
modulation.
DUAL BAND COMPANDOR
Traditionally, compandors have been a source of distortion in
wireless microphone systems. The basic problem with conventional systems is that the attack and decay times are always a
compromise. If the time constants are fast, high frequency
transients will not be distorted, but this will cause low frequency
distortion. If the time constants are slower, low frequency audio
distortion will be low, but high frequency transients will then be
distorted. The 100 system introduces an entirely new approach
to solving this basic problem, called “dual-band companding.”
There are actually two separate compandors in the 100 system,
one for high frequencies and one for low frequencies. A crossover network separates the frequency bands at 1kHz with a 6dB
per octave slope, followed by separate high and low frequency
compandors. The attack and release times in the high frequency
compandor are fast enough to keep high frequency transient
distortion at a low level, and the low frequency compandor uses
slower time constants, reducing low frequency distortion to well
below that of a conventional compandor.
PRE-EMPHASIS/DE-EMPHASIS
The signal to noise ratio of the 100 system is improved by using
pre-emphasis (HF boost) in the transmitter and de-emphasis
(HF roll off) in the receiver. Pre-emphasis and de-emphasis in
an FM radio system usually provides about a 10dB improvement
in the signal to noise ratio of the system, but the high frequency
boost in the transmitter must be removed in a purely complementary manner or else the frequency response of the original
audio signal will be altered.
The dual-band compandor in the 100 Series system essentially
provides a dynamic pre-emphasis/de-emphasis function with
extremely low distortion.
LONG BATTERY LIFE
High efficiency circuits throughout the design allow over 5 hours
of operation using a single 9 Volt alkaline battery. (A 9V lithium
battery will provide over 12 hours of operation.) The battery
compartment is a unique mechanical design which automatically
adjusts to fit any brand of battery. The battery contacts are
spring loaded to prevent “rattle” as the unit is handled.
FREQUENCY AGILITY
The transmitter section uses a synthesized, frequency selectable main oscillator. The frequency is extremely stable over a
wide temperature range and over time.
Two rotary switches, located on the side panel of the unit,
provide 256 frequencies in 100kHz steps over a 25.5MHz range.
This alleviates carrier interference problems in mobile or travelling applications.
MIC
JACK
PHASE LOCKED LOOP
SWITCHES
SHUNT
LIMITER
FREQ
+5V BIAS
SUPPLY
BUFFER
LIMIT
DIVIDER
LED
SET
LED
INPUT
AMP
PEAK AUDIO
INDICATOR &
LIMITER
DRIVER
AUDIO
LEVEL
PRESCALER
LOW PASS
FILTER
LP
FILTER
Vref
BASS
TREBLE
COMPANDED
UH100 Block Diagram
Rio Rancho, NM – USA
COMPANDOR
LP FILTER
HP FILTER
AUDIO
UH100
Block Diagram
PWR
VOLTAGE
CONTROLLED
OSCILLATOR
TRANSMITTER
COMPANDED AUDIO
TO XMTR
PWR
LED
Vreg
Vreg
+9VDC
+5VDC
+3.6VDC
3
CONTROLS AND FUNCTIONS
The UH100 may be used with a wide variety of microphones.
The 3-pin XLR connector on the UH100 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 a
floating signal ground, and pin 1 is case ground (see schematic
below). The UH100 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 UH100, the cause is an unbalanced
condition between pins 2 and 3 of the microphone.
To Mic
1uh
1K
Preamp
100
+5V
100uf
1uh
2
1
3
1uh
Input Jack Schematic
POWER SWITCH
Turns the battery power on and off.
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 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 battery. As the battery
voltage drops during use, the LED brightness will also decrease.
After 5 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
LEVEL LED
LIMIT LED
BATTERY
POWER
LED
O N
O F F
TOP VIEW
L E V E L
CONTROL PANEL
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.
MODULATION LEDS: Indicate the proper setting of the MIC
LEVEL control.
LEVEL LED: Flickers or glows most of 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.
FREQUENCY ADJUST
These two rotary switches adjust the center frequency of the
carrier. The 1.6M is a coarse adjustment and the 100K is the fine
adjustment. Each transmitter is factory aligned at the center of
its operating range. The default position of the frequency select
switches is in the center of the transmitter’s range.
0
1
F
E
D
C
B
A
2
3
4
5
6
9
7
8
0
1
F
E
D
C
B
A
2
3
4
5
6
9
7
8
Frequency select switches, default position (8,8)
4
UHF Multi-frequency Plug-on Transmitter
OPERATING INSTRUCTIONS
1) Insert the UH100 into the selected microphone. Listen for the
“click” that indicates the UH100 has locked on to the microphone. Pull on the mic to insure proper locking has occurred.
TO ATTACH
Press firmly, listen for click.
Depress collar fully.
Pull on mic to insure locking.
Attaching the Microphone
2) Slide the power switch to “ON”.
3) Hold the microphone as you will when you will be using it.
4) Position the microphone in the location you will use in actual
operation.
5) While speaking or singing at the same voice level that will
actually be used, observe the MODULATION LEDs. Adjust the
AUDIO LEVEL control knob until the LEDs begin to light. Start at
a low setting where neither LED lights as you speak. Gradually,
turn the gain up until one LED lights, then the other.
The -20 LED lights when the audio level is about 20dB below full
modulation. The “0” LED lights when the limiter begins to
operate. There is over 30dB of limiting range without overload
above the “0” LED, so it is desirable that the it lights up occasionally during use.
6) Once the gain has been adjusted, the audio system audio can
be turned on to make level adjustments.
OPERATING NOTES
The first LED turns on 20dB below full deviation. The “0” LED
turns on at full deviation and indicates that the input shunt
compressor is operating. The input limiter will handle peaks
over 30dB above full modulation, regardless of the gain control
setting. The limiter uses a true absolute value
circuit to detect both positive and negative
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
peaks. The attack time is 5 milliseconds and
the release time is 200 milliseconds. Occasional limiting is desirable, indicating that the
gain is correctly set and the transmitter is fully
modulated for optimum signal to noise ratio.
Different voices will usually require different settings of the AUDIO LEVEL control, so check this
adjustment as each new person uses the system. If several different people will be using the
transmitter and there is not time to make the
TO REMOVE
adjustment for each individual, adjust it for the
loudest voice.
ADJUSTING THE TRANSMITTER
FREQUENCY
If you are experiencing interference from another signal on your
frequency, you may want to change the operating frequency of
your system. The left switch changes the operating frequency
by 1.6 MHz per step and the right switch changes it 100 kHz per
step. If you are experiencing interference, change the operating
frequency in 100 kHz steps to find a clear channel. If it is not
possible to find a clear channel using the 100 kHz switch, return
it to its original position and change the 1.6 MHz switch by one
click then try the 100 kHz switch again.
0
1
F
E
D
C
B
A
2
3
4
5
6
9
7
8
0
1
F
E
D
C
B
A
2
3
4
5
6
9
7
8
The AUDIO LEVEL control knob should not be used to control
the volume of your sound system or recorder levels. This gain
adjustment matches the transmitter gain with the user’s voice
level and microphone positioning.
If the audio level is too high -- both LEDs will light frequently or
stay lit. This condition may reduce the dynamic range of the
audio signal.
If the audio level is too low -- neither LED will light, or the -20 LED
will light dimly. This condition may cause hiss and noise in the
audio, or pumping and breathing in the background noise.
Rio Rancho, NM – USA
To gain access to these switches, slide the access door sideways with a fingernail.
Note: With the UCR100 receiver, these switches also appear on
the side panel of the receiver. Normally, you should set the
transmitter switches to match the receiver switch settings..
5
BATTERY REPLACEMENT
The UH100 transmitter is powered by a standard alkaline 9 Volt Swing the door open and take note of the polarity marked inside
battery. It is important that you use ONLY ALKALINE OR showing the location of the positive (+) and negative (-) termiLITHIUM batteries for longest life. Standard zinc-carbon batter- nals. Insert the battery and close the cover by pressing in and
ies marked “heavy duty” or “long-lasting” are not adequate. across, reversing the opening procedure outlined above. Note
They will provide only about 5 minutes of operation. Similarly, that the battery door will NOT close if the battery is inserted
nicad rechargeable batteries only give 1 hour of operation, and incorrectly, since the terminals will hit a protective polarity barwill also run down quite abruptly. Alkaline batteries provide rier.
about 5 hours of operation while lithium batteries will run the unit
for about 12 hours.
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.
RELEASE
DOOR
SWING OPEN
Don’t force the battery door closed. If it is difficult to close, the
battery is in backwards.
OBSERVE
POLARITY
Battery Compartment Action
TROUBLESHOOTING
Before going through the following chart, be sure that you have a good battery in the transmitter. It is important that you follow these
steps in the sequence listed.
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.
4) Mic cable damaged or mis-wired.
6
UHF Multi-frequency Plug-on Transmitter
RECEIVER RF LAMP OFF 1) Transmitter not turned on.
2) Transmitter battery is dead.
3) Receiver antenna missing or improperly positioned.
4) Transmitter and receiver not on same frequency.
display on transmitter and receiver.
5) Operating range is too great.
NO SOUND (OR LOW SOUND LEVEL),
RECEIVER MOD LEVEL LEDs ARE ON 1) Receiver output level set too low.
2) Receiver output is disconnected; cable is defective or mis-wired.
3) Sound system input is turned down.
NO SOUND (OR LOW SOUND LEVEL),
RECEIVER MOD LEDs ARE OFF 1) Transmitter gain (audio level) set too low.
2) Faulty microphone
DISTORTED SOUND 1) Transmitter gain (audio level) is far too high. Check mod level
lamps on transmitter and receiver as it is being used. (Refer to
the Operating Instructions section for details on gain adjustment)
2) Receiver output may be mis-matched with the sound system or
recorder input. Adjust output level on receiver to the correct level
for the recorder, mixer or sound system.
3) Excessive wind noise or breath “pops.”
and/or use a larger windscreen.
Re-position microphone
Check switches/
4) Transmitter is not set to same frequency as receiver. Check that
frequency select switches on receiver and transmitter match.
HISS AND NOISE – AUDIBLE DROPOUTS 1) Transmitter gain (audio level) far too low.
2) Receiver antenna missing or obstructed.
3) Operating range too great.
EXCESSIVE FEEDBACK 1) Transmitter gain (audio level) too high causing the limiter to reduce
the dynamic range which in turn causes feedback. Check gain
adjustment and/or reduce receiver output level. (Refer to the
Operating Instructions section for details on gain adjustment)
2) Transmitter too close to speaker system.
3) Mic is too far from user’s mouth.
Rio Rancho, NM – USA
7
SPECIFICATIONS AND FEATURES
Operating frequencies: 537.6 to 588.7 MHz, 614.4 to 793.5 MHz
Frequency selection: 256 frequencies in 100kHz steps
RF Power output: 100 mW (nominal)
Frequency stability: ± 0.002%
Deviation: ± 20 kHz (max)
Spurious radiation: 90 dB below carrier at frequencies less than 1GHz
Equivalent input noise: -126 dBV
Input level: Nominal 2 mV to 300 mV, before limiting.
Input greater than 2V, with limiting.
Input impedance: 1K Ohm mic load impedance
Input compressor: Soft compressor, >30 dB range
Gain control range: 43 dB; semi-log rotary control
Modulation indicators: Dual LEDs indicate modulation level 12 dB below limiting and at
Controls: 2-position “OFF-ON” slide switch. Control panel knob adjusts audio
Audio Input Jack: 3-Pin XLR
Battery: Precision compartment auto-adjusts to accept any known alkaline
Battery Life: 5 Hours with alkaline 9 Volt, 12 hrs with lithium
Weight: 6.6 ozs. including battery
Dimensions: 1.5 x 1.5 x 4.2 inches
Emission Designator: 180KF3E
the onset of limiting.
gain. Rotary switches on side panel adjust transmitter frequency.
or lithium 9 Volt battery. (We’ve tried 150 different ones!)
Specifications subject to change without notice.
8
UHF Multi-frequency 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 out the interconnecting 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 connection, 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:
Lectrosonics, Inc.
PO Box 15900
Rio Rancho, NM 87174
USA
World Wide Web: http://www.lectrosonics.com Email: sales@lectrosonics.com
Shipping address:
Lectrosonics, Inc.
581 Laser Rd.
Rio Rancho, NM 87124
USA
Telephones:
Regular: (505) 892-4501
Toll Free (800) 821-1121
FAX: (505) 892-6243
Rio Rancho, NM – USA
9
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. 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
http://www.lectrosonics.com
September 25, 2002
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