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UH110
UHF MULTI-FREQUENCY
PLUG-ON TRANSMITTER - EURO MODEL
OPERATING INSTRUCTIONS
and trouble-shooting guide
LECTROSONICS, INC.
www.lectrosonics.com
Rio Rancho, NM - U.S.A.
0885
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INTRODUCTION
Thank you for selecting the Lectrosonics UH110 frequency agile, plug-on transmitter. The
UH110 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 UH110 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
UH110. Two hundred fifty six frequencies are user selectable to alleviate interference problems
in travelling venues.
The UH110 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 UH110 transmitter is covered in this manual. Companion receivers are covered in
separate manuals. The UH110 will operate with any 110 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
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UHF Multi-frequency Plug-on Transmitter
GENERAL TECHNICAL DESCRIPTION
The UH110 transmitters are comprised of a number of functional
subsystems as shown in the block diagram below.
GENERAL
The 110 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 110 system introduces an entirely new approach
to solving this basic problem, called “dual-band companding.”
There are actually two separate compandors in the 110 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 110 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 110 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 7 hours
of operation using a single 9 Volt alkaline battery. (A 9V lithium
battery will provide over 14 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 or 25kHz 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
UH110 Block Diagram
Rio Rancho, NM – USA
COMPANDOR
LP FILTER
HP FILTER
AUDIO
PWR
VOLTAGE
CONTROLLED
OSCILLATOR
COMPANDED AUDIO
PWR
LED
TRANSMITTER
TO XMTR
Vreg
Vreg
+9VDC
+5VDC
+3.6VDC
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CONTROLS AND FUNCTIONS
The UH110 may be used with a wide variety of microphones.
The 3-pin XLR connector on the UH110 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 UH110 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 UH110, 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 battery
LEVEL LED
LIMIT LED
BATTERY
POWER
LED
O N
O F F
TOP VIEW
L E V E L
CONTROL PANEL
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 left switch is a coarse adjustment and the right
switch 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)
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UHF Multi-frequency Plug-on Transmitter
OPERATING INSTRUCTIONS
1) Insert the UH110 into the selected microphone. Listen for the
“click” that indicates the UH110 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 set-
ting. 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 in
large steps and the right switch changes it in small steps. If you
are experiencing interference, change the operating frequency in
fine steps to find a clear channel. If it is not possible to find a
clear channel using the FINE switch, return it to its original
position and change the COARSE switch by one click then try the
FINE 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 UCR110 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..
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BATTERY REPLACEMENT
The UH110 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. They across, reversing the opening procedure outlined above. Note
will provide only about 5 minutes of operation. Similarly, nicad that the battery door will NOT close if the battery is inserted
rechargeable batteries only give 1 hour of operation, and will also incorrectly, since the terminals will hit a protective polarity barrun down quite abruptly. Alkaline batteries provide about 5 hours rier.
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.
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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
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SPECIFICATIONS AND FEATURES
Operating frequencies:
Frequency selection:
RF Power output:
Frequency stability:
Deviation:
Spurious radiation:
Equivalent input noise:
Input level:
Input impedance:
Input compressor:
Gain control range:
Modulation indicators:
537.6 to 862.0 MHz
256 frequencies in 100kHz steps (25kHz programmable)
50 mW (nominal)
± 0.001%
± 20 kHz typ, ± 50kHz max
90 dB below carrier at frequencies less than 1GHz
-126 dBV
Nominal 2 mV to 300 mV, before limiting.
Input greater than 2V, with limiting.
1K Ohm mic load impedance
Soft compressor, >30 dB range
43 dB; semi-log rotary control
Dual LEDs indicate modulation level 12 dB below limiting and at
the onset of limiting.
Controls:
Audio Input Jack:
Battery:
Battery Life:
Weight:
Dimensions:
Emission Designator:
2-position “OFF-ON” slide switch. Control panel knob adjusts audio
gain. Rotary switches on side panel adjust transmitter frequency.
3-Pin XLR
Precision compartment auto-adjusts to accept any known alkaline
or lithium 9 Volt battery. (We’ve tried 150 different ones!)
7 Hours with alkaline 9 Volt, 14 hrs with lithium
6.6 ozs. including battery
3.1 x 2.4 x .75 inches
180KF3E
Specifications subject to change without notice.
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UHF Multi-frequency Plug-on Transmitter
Rio Rancho, NM – USA
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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.
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 TROUBLESHOOTING 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 malfunction-
ing unit start working.
LECTROSONICS, INC.
581 LASER ROAD
RIO RANCHO, NM 87124 USA
www.lectrosonics.com
September 25, 2002
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