Page 1
UM700
DIGITAL FREQUENCY-AGILE
UHF BELT-PACK TRANSMITTER
OPERATING INSTRUCTIONS
and trouble-shooting guide
LECTROSONICS, INC.
Rio Rancho, NM
www.lectrosonics.com
Page 2
TABLE OF CONTENTS
INTRODUCTION.................................................................................................. 3
GENERAL TECHNICAL DESCRIPTION ............................................................ 4
CONTROLS AND FUNCTIONS .......................................................................... 6
BATTERY INSTALLATION ................................................................................... 8
OPERATING INSTRUCTIONS ............................................................................ 8
OPERATING NOTES ........................................................................................... 9
ADJUSTING THE TRANSMITTER FREQUENCY.............................................. 9
MICROPHONE CORD TERMINATION ............................................................. 10
5-PIN INPUT JACK WIRING ............................................................................. 11
A6U UHF ANTENNA..........................................................................................13
TROUBLESHOOTING .......................................................................................14
SPECIFICATIONS AND FEATURES................................................................. 15
SERVICE AND REPAIR..................................................................................... 16
RETURNING UNITS FOR REPAIR ................................................................... 16
WARRANTY .........................................................................................Back c ove r
The UM200C transmitter is FCC type accepted under Part 74: 470-608MHz and 614-802MHz
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Frequency Agile UHF Belt-Pack Transmitter
INTRODUCTION
The 700 Series wireless system was designed to take advantage of the superior
audio performance provided by DSP audio signal processing and the security
provided by proprietary digital and encrypted digital radio operation.
Several advantages are provided by a digital wireless system and DSP technology:
• A digital radio system provides outstanding signal to noise ratio
• The signal to noise ratio of a digital radio system does not vary with the RF signal
strength arriving at the receiver.
• DSP audio signal processing provides a superior limiter
• Eavesdropping is difficult and secure encryption techniques can be implemented
The UM700 is a rugged, machined aluminum package in a belt-pack configuration
with a removable, spring loaded belt clip. A 5-pin input jack provides taps for any
microphone or line level signal. The unit is powered by a single 9 Volt alkaline or
lithium battery, or from external DC using an optional battery eliminator. The antenna is a detachable, locking 1/4 wavelength flexible bronze alloy cable that connects to a 50 Ohm SMA port on the control panel.
Only the UM700 transmitter is covered in this manual. Companion receivers are
covered in separate manuals. The UM700 will operate with any 700 Series Lectrosonics receiver in the same frequency block.
Rio Rancho, NM – USA
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GENERAL TECHNICAL DESCRIPTION
GENERAL
The 700 Series wireless system uses digital modulation for an extremely high signal to noise ratio and freedom from
distortion and compandor artifacts. The input preamplifier uses an ultra low noise op amp for an excellent signal to
noise ratio. A dual-envelope limiter is implemented by the DSP firmware to cleanly limit input signal peaks up to
30dB above full modulation. The transmitter circuits are all regulated to allow full output power from the beginning (9
Volts) to the end (5.5 Volts) of batter y life.
The UM700 transmitter is comprised of a number of functional sub-systems as shown in the block diagram below.
UM700
Mic
Jack
1
2
3
4
5
Freq
Switches
+5V Bias
Supply
Buffer and
Lo Freq
Filter
LF
Roll-Off
uP
EEProm
Preamp and
Supersonic
Filter
Shunt
Limiter
From
DSP
Audio
Gain
Audio
Level
Multicolor
Audio Level
LEDs
Multicolor
Battery Status
LED
Analog to Digital
Converter
Synthesizer
To
uP
Digital Signal
Processor
To uP
Filter
Block Diagram
Modulator
Oscillator
9V
Drive
Amp
Polarity
Protection
Diode
Power
Power
Switch
Amp
Isolator
1
3
50
Switching
Pwr Supply
Delay Control
from uP
1/4 Wave
Antenna
2
4V Main
Pwr Supply
DIGITAL MODULATION
Digital modulation is used to eliminate compandor artifacts and provide an extremely high signal to noise ratio. A
proprietary compression algorithm is used to contain the RF energy into a narrower bandwidth than other digital
systems to allow the 700 Series system to utilize frequencies in FCC Part 74 for broadcast and motion picture
production. For applications that require secure operation that prevent eavesdropping, encryption can easily be
implemented.
AUDIO PROCESSING
The input circuitry includes an adjustable low frequency roll-off filter ahead of the limiter and gain stage to customize
the low frequency response for varying conditions. In controlled environments with minimal low frequency ambient
noise, such as a film production set, the frequency response can be extended to 30 Hz. For applications with
excessive low frequency energy, such as in a moving vehicle or rooms with HVAC noise, the low end can be rolled
off as high as 150 Hz to reduce the effects of the noise.
A “dual-envelope” limiter with 30 dB of range is next in the signal chain. This special limiter is software controlled,
being driven by the DSP to minimize “overshoot” and slow attack times that can occur in other types of limiter circuits.
The compressor works with two different time constants to cleanly handle a wide variety of dynamics. A fast peak
limiter prevents overload distortion from shar p, infrequent transients in the audio signal, and an averaging limiter with
longer time constants prevents “pumping” (gain modulation) that can occur with repeated peaks that are closely
spaced. Supersonic filtering is provided to prevent excessive high frequency energy from entering the A/D converter.
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Frequency Agile UHF Belt-Pack Transmitter
A/D CONVERTER AND DSP PROCESSOR
The processed audio signal enters the A/D converter to generate a digital signal for the modulator. A proprietary
algorithm is used for sampling and compression to minimize noise and distortion, and provide a wide, flat frequency
response. The signal then enters the modulator to generate a digitally modulated radio signal.
OUTPUT SECTION
Intermodulation (IM) occurs in the final amplifier stages of conventional transmitters when the transmitters are within
a few feet of each other. This can create serious problems in multi-channel wireless systems when an IM signal falls
on the carriers, IF frequencies, etc. of the systems being operated. To eliminate this problem in the UM700, the
modulated radio signal passes through a circular isolator before entering the antenna. The circular isolator functions
like a “one-way check valve” to allow the RF signal to pass through to the antenna, but not to pass backwards into
the amplifier stage. RF signals from other nearby transmitters cannot reach the output amplifier in the UM700. This
provides excellent stability and eliminates IM in the output stage of the transmitter.
LONG BATTERY LIFE
High efficiency circuits and switching power supplies throughout the design allow over 4.5 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
700 Series wireless systems are available on eight different “blocks” of 256 frequencies, from 537.600 to 767.900
MHz. Each of these blocks provides 256 selectable frequencies in 100 kHz steps over a 25.6 MHz bandwidth. This
wide variety of selectable frequencies alleviates carrier interference problems in mobile or traveling applications. Two
16-position rotary switches on the side panel of the unit are used to select the frequency.
The UM700 transmitter section uses a synthesized, frequency selectable main oscillator The frequency is extremely
stable over a wide temperature range and over time.
ANTENNA
At UHF frequencies, where wavelengths and antennas are shorter than at VHF frequencies, a resonant length wire is
preferred over using the microphone cable as the antenna. The antenna on the UM700 consists of a flexible 1/4
wavelength bronze cable, detachable via an SMA connector. The impedance of this connector is 50 Ohms.
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CONTROLS AND FUNCTIONS
LECTROSONICS
UM700
OFF ON
AUDIO
LEVEL
ANTENNA
75 Hz
35
150
LF ROLL OFF
FREQUENCY
1.6MHz
FCCID:DBZUM700
Lectrosonics, Inc.
Made in U.S.A.
100kHz
BLK 20 (BK)
512.0 - 537.5
SN:
XXXX
INPUT JACK
The input jack on the UM700 is a Switchcraft TA5M connector that accommodates virtually every lavalier, hand-held
or shotgun microphone available, with positive or negative bias. The input will also cleanly handle line level signals
up to 300 mV before limiting. Use a Switchcraft TA5F connector on the microphone cable or input adapter cord .
See the separate sheet titled “Transmitter 5-Pin Input Jack Wiring” regarding the correct connections for
various microphones, and other sources.
ON/OFF SWITCH
Turns the battery power on and off. Even when the switch is turned off or on abruptly, the digital muting prevents
“thumps” or transients from occurring.
“ON” LAMP
Glows brightly when the battery is good and the ON/OFF switch is ON. This tri-color LED will indicate the condition
of the battery in the transmitter as follows:
Green - battery good
Yellow - battery getting low
Red - battery very low - change now
Blinking Red - battery critical - failure imminent
FREQUENCY ADJUST (located under the sliding door)
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.
Since the internal circuits are all tightly regulated and the RF output stage is powered by a regulated supply, the
transmitter will continue to operate perfectly to a battery voltage of 5.5 Volts.
Please note that a weak battery will sometimes light the POWER LED
immediately after turn on, but will soon discharge to the point where the
LED will indicate a weak battery, just like a flashlight with “dead” batteries.
The combination of an accurate battery condition indicator and regulation of all
internal circuits provides much longer battery life, as well as consistent performance over the life of the battery.
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
6
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Frequency Agile UHF Belt-Pack Transmitter
AUDIO LEVEL CONTROL
Used to adjust the audio input level for proper modulation.
AUDIO LEVEL LEDS
Indicate the proper setting of the MIC LEVEL control.
The two audio level LED’s are bi-colored (red/.green) and indicate 5 levels -
Off - Off no audio modulation
Green - Off low audio
Green - Green moderate audio
Yellow - Yellow full audio
Red - Red limiting
ANTENNA
The flexible wire antenna supplied with the transmitter is cut to 1/4 wavelength of the center of the frequency block
(the frequency range) of the transmitter. It is removable via an SMA connector. The SMA connector is a 50 Ohm RF
port which can also be connected directly to test equipment. Replacement antennas are available in pre-cut lengths
for specific frequency blocks, or as a kit with instructions to cut the antenna for any frequency block.
ADJUSTABLE LOW FREQUENCY ROLL-OFF
A 18dB per octave low frequency roll-off is provided in the audio section, with the -3dB point adjustable from 35Hz to
150Hz. The actual roll-off frequency will vary somewhat according to the low frequency response of the mic capsule
being used.
The low frequency roll-off control is used to reduce the undesirable effects of very low frequency audio often produced by air conditioning systems, automobile traffic and other sources. Excessive low frequency content in the
audio input can cause overload of the program audio in recording applications. In sound reinforcement systems,
excessive low frequency content can cause excessive power amplifier drain or even damage to loudspeaker systems. A common example is wind blowing across a microphone, causing very high levels of low frequency audio
(“wind noise”). By rotating the roll-off control clockwise, the hinge point of the roll-off is increased to reduce the level
of low frequencies. In low noise situations, such as a motion picture production set indoors where environmental
noise is minimal, the control can be rotated counter-clockwise to permit low frequency audio to be captured.
THE BELT CLIP
The belt clip may be removed for special applications by removing one screw.
USE
ONLY THE SCREW THAT IS SUPPLIED
The circuitry is tightly packed into this unit. A longer screw
Lectrosonics PN:28528 which is a Phillips head, 4-40 x 3/16", FL100 screw.
will permanently damage the transmitter! Use only
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BATTERY INSTALLATION
The transmitter is powered by a standard alkaline or lithium 9 Volt battery. It is important that you use ONLY an
ALKALINE or LITHIUM battery for longest life. Standard zinc-carbon batteries marked “heavy-duty” or “long-
lasting” are not adequate. Ni-cad rechargeable batteries will only provide 1.5 hours of operation, or less, and will
run down quite abruptly. Unless it is cold, alkaline batteries provide over 4.5 hours of operation. Lithium batteries
can be used to provide up to 14 hours. Care should be taken not to leave a fully discharged lithium battery in the
transmitter, as swelling of the battery can make it difficult to remove from the compartment. The battery status
circuitry is designed for the voltage drop over the life of alkaline batteries.
To open the battery compartment, press outward on the cover door in the direction of the arrow as shown in the
drawing. Only firm, 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. You can see the
large and small contact holes inside the battery compartment with the door open.
Swing the
Press outward on the
battery door in this
direction
door open
Insert the batter y correctly and close the cover by pressing the door closed and across, reversing the opening
procedure illustrated above. If the battery is inserted incorrectly, the door will not close. Do not force the door
closed.
OPERATING INSTRUCTIONS
1) Install a fresh battery according to the instructions above.
2) Insert the microphone plug into the input jack, aligning the pins; be sure that the connector locks in.
3) Attach the antenna to the SMA connector on the top of the transmitter.
4) Mute the sound system.
5) Turn the transmitter power switch to the “ON” position.
6) Position the microphone in the location you will use in actual operation.
7) While speaking or singing
Adjust the AUDIO LEVEL control knob until the LEDs begin to light. Start at a low setting where neither LED
lights as you speak.
8
at the same voice level that will actually be used, observe the MODULATION LEDs.
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Frequency Agile UHF Belt-Pack Transmitter
OPERATING NOTES
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 be Red frequently or stay Red. This condition may reduce the dynamic
range of the audio signal.
If the audio level is too low — neither LED will light, or only one LED will flicker Green. This condition will reduce the
signal to noise ratio of the system.
The input limiter will handle peaks up to 30dB above full modulation. 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 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.
To gain access to these switches, slide the access door sideways with a fingerrnail.
The UDR700 receiver front panel will indicate the correct switch settings to match the receiver frequency.
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
5
6
9
7
8
4
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MICROPHONE CORD TERMINATION
TA5F Connector Assembly
1
23
VIEW FROM SOLDER
SIDE OF PINS
4
5
0.15"
0.3"
Heatshrink
Tubing
Mic Cord Stripping Instructions
Caution!
Do not allow the shield wire to touch any
metal part of the connector shell.
The shield wire is the antenna on VHF
models and poor operating range will result.
10
Rubber
Insulation
Crimp
Tabs
Shield Wire
Crimp
Tabs
Rubber
Insulation
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Frequency Agile UHF Belt-Pack Transmitter
5-PIN INPUT JACK WIRING
The wiring diagrams shown on the next page represent the basic wiring necessary for the most common types of
microphones and other audio inputs. Some microphones may require extra jumpers or a slight variation on the
diagrams shown.
Caution - When wiring the connector, do not use the connector body for any electrical connections.
A common mistake is to use the connector body as an audio ground. The connector body is
already used as an RF ground on VHF models and no other use is permitted.
It’s virtually impossible to keep completely up to date on changes that other manufacturers make to their products. It
is possible that you may encounter a microphone that differs from these instructions. If this occurs please call our
toll-free number listed in the back manual. Our service department can answer your questions regarding microphone compatibility.
When used on a wireless transmitter, the microphone element is in the proximity of the RF coming from the transmitter. The nature of electret microphones makes them sensitive to RF, which can cause problems with the microphone/
transmitter compatibility. If the electret microphone is not designed properly for use with wireless transmitters, it may
be necessary to install a chip capacitor in the mic capsule or connector to block the RF from entering the electret
capsule. This modification is shown on the next page.
LECTROSONICS
4
3
5
2
1
1
2
3
4
5
NEG GND (OR BIAS)
POS BIAS (OR GND)
MIC
SOURCE LOAD
LINE IN
330PF
1uH
330PF
100
1K
10K
5V Mic Bias
5mA max
+
To Mic Amp
Transmitter
Input Jack
UHF Transmitter Equivalent Input Circuit
VHF transmitters use the shield of the microphone cord as the antenna. The UM700 uses a 1/4 wave flexible wire to
radiate the RF signal. There is really not much difference between these two approaches, with respect to the effect
of the RF on the microphone capsule. Even in transmitters that utilize a “dangling wire,” the microphone is still part
of the “ground plane” and is therefore still in the antenna circuit.
PIN 1 Shield (ground) for positive biased electret lavalier microphones. For the increasingly rare negative biased
electret lavaliere microphones, it is the bias voltage source. It is also the shield (ground) for dynamic microphones and line level inputs.
PIN 2 Shield (ground) for negative biased electret lavalier microphones. Bias voltage source for positive biased
electret lavaliere microphones.
PIN 3 Low impedance microphone level input for dynamic microphones. Also accepts hand-held electret micro-
phones that have their own battery or power supply.
PIN 4 1K Ohm source load for non-Lectrosonics electret microphones. Use in conjunction with other pins to
provide attenuation of high level input signals.
PIN 5 10k high impedance, line level input for tape decks, mixer outputs, musical instruments, etc.
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RF BYPASSING
R
3
Some mics require RF protection to keep the radio signal
from affecting the capsule, even though the transmitter
input circuitry is already RF bypassed (see schematic
diagram).
If the mic is wired as directed, and you are having
difficulty with squealing, high noise, or poor frequency
response; RF is likely to be the cause.
The best RF protection is accomplished by installing RF
Preferred locations for bypass capacitors
SHIELD
AUDIO
CAPSULE
TA5F
CONNECTOR
Alternate locations for bypass capacitors
CAPSULE
3 WIRE MIC2 WIRE MIC
SHIELD
AUDIO
BIAS
TA5F
CONNECTO
bypass capacitors at the mic capsule. If this is not
possible, or if you are still having problems, capacitors
can be installed on the mic wires inside the TA5F connector housing.
Install the capacitors as follows: Use 330 pF capacitors. Capacitors are available from Lectrosonics. Please specify
the part number for the desired lead style.
Leaded capacitors: P/N 15117 Leadless capacitors: P/N SCC330P
All Lectrosonics lavalier mics are already bypassed and do not need any additional capacitors installed for proper
operation.
BODY GROUND
Caution - When wiring the connector, do not use the connector body for any electrical connections. A common
mistake is to use the connector body as an audio ground. The connector body is already used as an RF ground on
VHF models and no other use is permitted.
LINE LEVEL SIGNALS
The normal hookup for line level signals is: Signal Hot to pin 5, Signal Gnd to pin 1, pin 4 jumped to pin 1, and pin 3
jumped to pin 1. This gives a 40dB attenuator that allows signal levels much higher than 3V to be applied without
limiting.
If more headroom is needed, insert a 100k resistor in series with pin 5. Put this resistor inside the TA5F connector to
minimize noise pickup.
If lower than normal line levels (less than 1V) are expected, use this hookup: Signal Hot to pin 5, Signal Gnd to pin
1, and pin 4 jumpered to pin 1. This provides a 20dB attenuator allowing signals as high as 3V to be applied without
limiting.
WIRING HOOKUPS FOR DIFFERENT SOURCES
PIN
PIN
1
2
3
4
5
1
2
3
4
5
4
3
TA5F
PLUG
4
3
TA5F
PLUG
1
5
2
1
5
2
3 WIRE ELECTRET MIC
POSITIVE BIAS
2 WIRE ELECTRET MIC
POSITIVE BIAS
SHIELD
BIAS
AUDIO
SHIELD
AUDIO
PIN
PIN
1
2
3
4
5
1
2
3
4
5
4
3
TA5F
PLUG
4
3
TA5F
PLUG
1
5
2
1
5
2
2 WIRE ELECTRET MIC
NEGATIVE BIAS
SLEEVE
TIP
LINE LEVEL
RCA or 1/4 " PLUG
(See notes on ‘LINE LEVEL SIGNALS” above.)
SHIELD
AUDIO
SHIELD
AUDIO
SHIELD
WIRE ELECTRET MIC
NEGATIVE BIAS
12
BIAS
AUDIO
PIN
1
2
3
4
5
4
3
TA5F
PLUG
1
5
2
2
3
DYNAMIC
MIC LEVEL
PIN
1
1
2
3
Dynamic LO Z mic or electret with
manufacturers power supply.
SHIELD
PIN
1
2
4
1
5
3
TA5F
PLUG
2
3
4
5
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Frequency Agile UHF Belt-Pack Transmitter
A6U UHF ANTENNA
This is a full size cutting template. Lay the actual antenna on top of this drawing and cut at the
mark for the desired frequency group.
Install cap on end of antenna
after cutting to length.
Black cap
Colored sleeve
31
33
29
32
30
26
28
27
25
24
23
22
21
Frequency Blocks
Kits are shipped from the factory with caps of the various colors plus a black cap. After cutting the antenna to the
desired block length, select the properly colored cap and cut off the closed end to make the colored sleeve. Slide the
colored sleeve onto the antenna as shown above then slide the black cap onto the cut end of the antenna.
FREQUENCY ANT SLEEVE ANTENNA
BLOCK RANGE COLOR WHIP LENGTH
21 537.600 - 563.100 Brown 4.74"
22 563.200 - 588.700 Red 4.48"
23 588.800 - 614.300 Orange 4.24”
24 614.400 - 639.900 Yellow 4.01"
25 640.000 - 665.500 Green 3.81"
26 665.600 - 691.100 Blue 3.62"
27 691.200 - 716.700 Violet (Pink) 3.46"
28 716.800 - 742.300 Gre y 3.31"
29 742.400 - 767.900 White 3.18"
30 768.000 - 793.500 Orange/Black 3.08"
31 793.600 - 819.100 Or ange/Bro wn 2.99”
32 819.200 - 844.700 Orange/Red 2.92”
33 844.800 - 865.000 Orange/Orange 2.87”
The sleeve color follows the standard resistor color code for the second
numeral in the group number.
*IMPORTANT
Whip Length
Measure the length of the whip that protrudes outside of the SMA connector.
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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.
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. Check
switches/display on transmitter and receiver.
5) Operating range is too great.
6) Transmitter antenna not connected
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 or recorder input is turned down.
DISTORTED SOUND 1) Transmitter gain (audio level) is far too high. Check mod
level lamps on tr ansmitter and receiver as it is being used.
(refer to pages 8/9 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.” Re-position
microphone and/or use a larger windscreen.
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) Transmitter antenna missing.
4) Operating range too great.
EXCESSIVE FEEDBACK 1) Transmitter gain (audio level) too high. Check gain
adjustment and/or reduce receiver output level.
2) Transmitter too close to speaker system.
3) Mic is too far from user’s mouth.
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Frequency Agile UHF Belt-Pack Transmitter
SPECIFICATIONS AND FEATURES
Operating Principle: Proprietary digital modulation with encr yption
Operating frequencies: 525.000 to 870.000 MHz depending upon local regulations
Frequency selection: 256 frequencies in 100kHz steps
RF Power output: 50 mW (nominal)
Frequency stability: ± 0.001%
Equivalent input noise: –126 dBV
Input level: Nominal 2 mV to 300 mV, before limiting.
Spurious radiation: 70 dB below carrier
Input Level: Nominal 2 mV to 300 mV before limiting
Greater than 30 V maximum with limiting
Input impedance: Taps provided for 100, 1k, 10k Ohm
Input compressor: Dual-envelope limiter; 30 dB range
Gain control range: 43 dB; semi-log rotary control
Modulation indicators: Dual multi-color LEDs indicate modulation level in 5 steps at
-20, -10, -5, 0, +5 dB with green, yellow and red indications
Low frequency roll-off
adjustment: –18dB/octave; 35Hz to 150Hz
Controls: 2 position “OFF-ON” slide switch for noiseless turn on/turn off operation.
Front panel knob adjusts audio gain. Recessed control on side panel
adjusts low frequency rolloff. Rotary switches on side panel adjust
transmitter frequency.
Audio Input Jack: Switchcraft 5 pin locking (TA5M)
Antenna: Detachable, flexible 1/4 wave cable. 50 Ohm port allows
connection to test equipment.
Battery: Precision compartment auto-adjusts to accept any known alkaline 9 Volt
battery. (We’ve tried over 150 different ones!)
Battery Life: 4.5 hours (alkaline); 14 hours (lithium)
Weight: 6.3 ozs. including battery
Dimensions: 3.1 x 2.4 x .75 inches
Emission Designator: 180KQ2E
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Specifications subject to change without notice .
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
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
W orld W ide Web: http://www.lectrosonics.com Email: sales@lectrosonics.com
outside of the shipping container.
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Frequency Agile UHF Belt-Pack Transmitter
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Rio Rancho, NM – USA
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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, we will, at our option, repair or replace any defective
parts without charge for either parts or labor. If we cannot correct the defect in your
equipment, we will replace it at no charge with a similar new item. We will pay for
the cost of returning your merchandise to you.
This warranty applies only to items returned to us, shipping costs prepaid, within one
year from the date of purchase.
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
www.lectrosonics.com
March 26, 2001
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