Lectrosonics UM400AV WIRELESS MICROPHONE TRANSMITTER User Manual USERS MANUAL

Lectrosonics Inc WIRELESS MICROPHONE TRANSMITTER USERS MANUAL

USERS MANUAL

UM400aFrequency Synthesized 100 mW UHF Belt-Pack TransmitterINSTRUCTION MANUALRio Rancho, NM, USAwww.lectrosonics.comFill in for your records: Serial Number: Purchase Date:FeaturingDigital Hybrid Wireless™ Technology
UM400aLECTROSONICS, INC.2
Frequency Synthesized UHF Belt-Pack TransmitterRio Rancho, NM 3Table of ContentsGeneral Technical Description ..............................................................................................................................................................4Introduction ...........................................................................................................................................................................................4Digital Hybrid Technology .......................................................................................................................................................................................... 4UM400a Block Diagram ........................................................................................................................................................................4No Pre-Emphasis/De-Emphasis ...........................................................................................................................................................5Pilot Tone Squelch ................................................................................................................................................................................5Input Limiter ..........................................................................................................................................................................................5Wide-Band Deviation ............................................................................................................................................................................5Batteries, Battery Life and External Power ...........................................................................................................................................5Frequency Selection .............................................................................................................................................................................5Antenna .................................................................................................................................................................................................5Controls and Functions .........................................................................................................................................................................6Input Jack ..............................................................................................................................................................................................6Power ON/OFF Switch ..........................................................................................................................................................................6Power On LED ......................................................................................................................................................................................6Audio Level Control ...............................................................................................................................................................................6Modulation LEDs ...................................................................................................................................................................................7Antenna .................................................................................................................................................................................................7Frequency Select Switches ...................................................................................................................................................................7Adjustable Low Frequency Roll-Off .......................................................................................................................................................7Belt Clip .................................................................................................................................................................................................7Battery Installation .................................................................................................................................................................................8Operating Instructions ...........................................................................................................................................................................8Selecting the Compatibility Mode ..........................................................................................................................................................8Attaching a Microphone and Adjusting Gain .........................................................................................................................................9Operating Notes ....................................................................................................................................................................................9Adjusting the Transmitter Frequency .....................................................................................................................................................95-Pin Input Jack Wiring ........................................................................................................................................................................10Microphone Cord Termination .............................................................................................................................................................11TA5F Connector Assembly .................................................................................................................................................................11Mic Cord Stripping Instructions ...........................................................................................................................................................11Microphone RF Bypassing ..................................................................................................................................................................12Line Level Signals ...................................................................................................................................................................................Wiring Hookups for Different Sources ...............................................................................................................................................13Works with Servo Inputs Only: ............................................................................................................................................................13Compatible with Servo Inputs and other Lectrosonics Transmitters: ...................................................................................................13Replacement Parts and Accessories ..................................................................................................................................................14UHF Transmitter Antenna Specifications ............................................................................................................................................14Troubleshooting ....................................................................................................................................................................................15Specifications and Features ................................................................................................................................................................17Service and Repair ...............................................................................................................................................................................18Returning Units for Repair ..................................................................................................................................................................18© Copyright 2007 Lectrosonics. Inc
UM400aLECTROSONICS, INC.4IntroductionThe UM400a transmitter combines 100 mW of RF output with +/- 75 kHz wide deviation for extended operating range and extremely high signal to noise ratio. These key design features are coupled with the com-pandor-free Digital Hybrid Wireless® audio chain and packaged in the widely recognized Lectrosonics stan-dard transmitter housing.The unit is powered by a single 9V battery in the inter-nal compartment, or from external DC using a Lectro-sonics ISO9VOLT battery eliminator.Digital Hybrid TechnologyAll wireless links suffer from channel noise to some degree, and all wireless microphone systems seek to minimize the impact of that noise on the desired signal. Conventional analog systems use compandors to improve the signal to noise ratio, at the cost of subtle artifacts (known as “pumping” and “breathing”). Wholly digital systems defeat the noise by sending the audio information in digital form, at the cost of some combina-tion of power, bandwidth and resistance to interference.The Lectrosonics Digital Hybrid system overcomes channel noise in a dramatically new way, digitally encoding the audio in the transmitter and decoding it in the receiver, yet still sending the encoded informa-<--See 5-Pin Input Jack Wiring for details.UM400a Block DiagramGeneral Technical Descriptiontion via an analog FM wireless link. This proprietary algorithm is not a digital implementation of an analog compandor but a technique which can be accomplished only in the digital domain, even though the inputs and outputs are analog signals. Channel noise still has an impact on received signal quality and will eventually overwhelm the receiver. The Digital Hybrid simply encodes the signal to use a noisy channel as efficiently and robustly as possible, yield-ing audio performance that rivals that of wholly digital systems, without the power and bandwidth problems inherent in digital transmission. As always, these advantages come at a cost. The Digital Hybrid system requires fairly intensive digital processing in both the transmitter and the receiver. These processors cost money, take up space and consume power. The Digital Hybrid system also requires that the underlying RF link be of excellent quality, with better frequency response and distortion characteristics than that required by con-ventional systems.Because it uses an analog FM link, the Digital Hybrid enjoys all the benefits of conventional FM wireless systems, such as excellent range, efficient use of RF spectrum, and long battery life. However, unlike con-ventional FM systems, this unique design has done away with the analog compandor and its artifacts.
Frequency Synthesized UHF Belt-Pack TransmitterRio Rancho, NM 5No Pre-Emphasis/De-EmphasisThe signal to noise ratio of the hybrid system is high enough to preclude the need for conventional pre-em-phasis (HF boost) in the transmitter and de-emphasis (HF roll off) in the receiver. Pre-emphasis and de-em-phasis in an FM radio system usually provides about a 10 dB 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.Pre-emphasis can also cause distortion in the receiver. As this signal is passed through the IF filters in the receiver, distortion can be produced, most noticeably at full modulation. De-emphasis cannot be applied until the signal is converted into audio, so there is no way around this problem short of eliminating pre-empha-sis altogether. Neither of these problems occur in the hybrid system design.Pilot Tone SquelchThe system uses one of 256 different ultrasonic tones between 25 and 32 kHz, that modulate the carrier to operate the receiver squelch. The pilot tone frequency is chosen according to which of the 256 channels has been selected by the frequency switch setting. The pur-pose of the pilot tone squelch system is that the receiv-er will remain muted until it receives the pilot tone from the matching transmitter, even if a strong RF signal is present on the carrier frequency of the system. The UM400a extends this concept even further by ensuring that all transmitters in a system have different pilot tone frequencies so that even spurious RF from the wrong transmitters can’t open the receiver squelch. Input LimiterThe transmitters employ a digitally-controlled analog audio limiter just before the analog-to-digital converter. The limiter has a range of more than 30 dB for excellent overload protection. A dual release envelope makes the limiter acoustically transparent while maintaining low distortion. It can be thought of as two limiters in series, connected as a fast attack and release limiter followed by a slow attack and release limiter. The limiter recovers quickly from brief transients, so that its action is hidden from the listener, but recovers slowly from sustained high levels, to both keep audio distortion low and preserve short term dynamic changes.Generally speaking, some limiting is desirable in normal operation to improve the signal to noise ratio of the system. The limiting action is not audible and does not create distortion. A highly trained ear would hear only the compression of the peaks in the audio signal, which is desirable with most recorders and many sound rein-forcement systems.Wide-Band Deviation± 75 kHz deviation improves the capture ratio, signal to noise ratio and AM rejection of a wireless system dra-matically, compared to the more commonly used ±15 kHz deviation.Frequency SelectionThe 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 100 kHz steps over a 25.5 MHz range. This alleviates carrier interference problems in mobile or traveling applications.AntennaThe antenna on the UM400a consists of a rugged 1/4 wavelength stranded and galvanized steel cable, de-tachable via an SMA connector. The impedance of this antenna port is 50 Ohms.
UM400aLECTROSONICS, INC.6Input JackThe input on the UM400a accommodates virtually every lavaliere, hand-held or shotgun microphone available. Different line level signals can also be accommodated. (See Wiring Hookups for Different Sources.)Power ON/OFF SwitchTurns the transmitter on and off. Even when the switch is turned off or on abruptly, the pilot tone muting system prevents “thumps” or transients from occurring.Power On LEDThe Power LED glows green when the battery is good and the transmitter is turned on. The LED will glow yellow/orange as the battery voltage drops and finally glows red when there are about 30 minutes of operation left (when using the recommended battery). The LED blinks red when there are only a few minutes of life left.Input JackPower ON/OFF SwitchAUDIO LEVEL ControlModulation LEDsANTENNA JackPower LED1.6M 100KFrequency Select Switches0123456789ABCDEF0123456789ABCDEFLow Frequency Roll Off ControlControls and FunctionsNOTE: While a NiMH battery provides long operating time, it will give little or no warning when depleted. If you use a NiMH battery in the UM400a, we recommend trying a fully charged battery in the unit, noting the length of time that the battery will run the unit and in the future use somewhat less than that time to determine when the battery needs to be replaced.A weak battery will sometimes light the Power LED to the “good” green indication immediately after being put in the unit, but will quickly discharge to the point where the LED will go red or shut down (just like a flashlight with “dead” batteries). If the lamp fails to light, the bat-tery should be replaced.Audio Level ControlThe front panel AUDIO LEVEL Control is used to adjust the incoming audio input level for proper modulation.
Frequency Synthesized UHF Belt-Pack TransmitterRio Rancho, NM 7Belt ClipBelt ClipRetaining ScrewLocationModulation LEDsThe Modulation LEDs provide a visual indication of the input audio signal level from the microphone. These two bicolor LEDs can glow either red or green to indi-cate modulation levels.Signal Level -20 LED -10 LEDLess than -20 dB Off Off-20 dB to -10 dB Green Off-10 dB to +0 dB Green Green+0 dB to +10 dB Red GreenGreater than +10 dB Red RedThe Modulation LEDs are also used to indicate the Compatibility Mode when the transmitter is initially turned on. The Modulation LEDs will blink simultane-ously: • Once for 100 Series mode • Two times for 200 Series mode • Three times for mode 3 • Four times for Digital Hybrid Wireless® or 400 Series mode • Five times for IFB mode* • Six times for mode 6Modes 3 and 6 provide compatibility with other manu-facturer’s receivers - contact the factory for details.AntennaThe flexible galvanized steel cable antenna supplied with the transmitter is cut to 1/4 wavelength of the cen-ter of the frequency block (the frequency range) of the transmitter. 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.Frequency Select SwitchesTwo 16-position rotary switches adjust the center fre-quency of the carrier. The 1.6M is a coarse adjustment and the 100K is the fine adjustment.*Not available on earlier units.Adjustable Low Frequency Roll-OffA 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 remove subsonic (or 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 a variety of audio problems including driving the transmitter into limiting. In sound reinforce-ment systems, as one instance, excessive low frequen-cy content can cause excessive power amplifier drain or even damage to loudspeaker systems. By rotating the control clockwise, the hinge point of the roll-off is increased to reduce the level of low frequencies. In controlled situations, such as a motion picture produc-tion set indoors where environmental noise is minimal, the control can be rotated counter-clockwise to permit low frequency audio to be captured.Belt ClipThe belt clip may be removed for special applications by removing one screw.WARNING: Use ONLY the screw that is supplied.The circuitry is tightly fitted into this unit. A longer screw will permanently damage the transmitter!Low Frequency Roll-Off Control
UM400aLECTROSONICS, INC.8To open the battery compartment, press outward on the cover door in the direction of the arrow as shown in the illustration. 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 also see the large and small contact holes inside the battery compartment with the door open.Insert the battery correctly and close the cover by press-ing 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.*Not available on earlier units.Battery InstallationSelecting the Compatibility ModeThe UM400a can be used with Lectrosonics 400 Series Digital Hybrid, 200 Series analog, 100 Series analog, Lectrosonics IFB and some non-Lectrosonics analog wireless receivers. Contact the factory for details on the non-Lectrosonics models that can be used. The transmitter must be set to the operating mode of the matching receiver, which is done using the supplied screwdriver and a battery.NOTE: The unit is supplied from the factory as a Digital Hybrid (400 series) transmitter.1) Ensure the battery is good.2) Turn off the transmitter.3) With a small screwdriver (one is included with your unit), set the Frequency Select Switches to CC. (for Change, Change). 4) Power up the unit briefly – just long enough for the LED’s to light up and then turn it off.5) Change the Frequency Select Switches to one of the following settings:• To set Lectrosonics 100 Series mode: set switches to 1,1• To set Lectrosonics 200 Series mode: set switches to 2,2• To set Mode 3: set switches to 3,3 (contact the factory for details)• To set Lectrosonics Hybrid mode: set switches to 4,4• To set IFB mode: set switches to 5,5*• To set Mode 6: set switches to 6,66) Turn the unit on, wait a couple of seconds and turn off again.7) Change the Frequency Select Switches to 0,0.8) Turn on the transmitter to complete the operation.The LEDS will blink to indicate the selected com-patibility mode. Immediately after power up, all LEDS will blink together red, then green, followed by the audio level LEDs (-20 and -10) blinking to indicate the mode. The -20 and -10 LEDs will blink: • Once for 100 Series mode • Two times for 200 Series mode • Three times for Mode 3 • Four times for Hybrid mode • Five times for IFB mode* • Six times for Mode 6At powerup the transmitter will confirm the current compatibility mode with the number of blinks listed here. This setting will remain the same until you reset it with the procedure listed above. Operating Instructions
Frequency Synthesized UHF Belt-Pack TransmitterRio Rancho, NM 90123456789ABCDEF0123456789ABCDEF1.6M 100KAttaching a Microphone and Adjusting Gain1) Ensure the battery is in good condition.2) Insert the microphone plug into the input jack, align-ing the pins; be sure that the connector locks.3) Attach the antenna to the SMA connector on the top of the transmitter.4) Mute the associated receiver’s audio output.5) Turn on the transmitter.6) Position the microphone in the location you will use in actual operation. While speaking or sing-ing at the same voice level that will actually be used, observe the Modulation LEDs. Adjust the AUDIO LEVEL control until the –20 dB LED glows green with occasional red flickers and -10 dB glows green.* This will set the gain of your transmitter to between +0 dB and +10 dB modulation. (See chart below.) Signal Level -20 LED -10 LEDLess than -20 dB Off Off-20 dB to -10 dB Green Off-10 dB to +0 dB Green Green+0 dB to +10 dB Red Green *optimumGreater than +10 dB Red Red7) Once the gain has been adjusted, the audio system audio can be turned on to make level adjustments in the main audio system.NOTE: The transmitter Audio Level Control 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. Adjust the receiver output level to match the sound system or recorder.Operating NotesIf the audio level is too high — both LEDs will blink red frequently or glow a steady red. This condition may reduce the dynamic range of the audio signal.If the audio level is too low — neither LED will glow, or only the -20 LED will glow green. This condition may cause hiss and noise in the audio.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 FrequencyIf you are experiencing interference from another signal on your frequency, you will need to change the operat-ing frequency of your system. If you are using a receiver with a frequency scan func-tion, find a clear frequency with the receiver, then set the transmitter to the frequency selected with the re-ceiver. Simply change frequencies to one where no RF is indicated on the receiver.Note: Leave the transmitter turned off while you search for a clear frequency.The left switch changes the operating frequency by 1.6 MHz per step and the right switch changes it 100 kHz per step. Start by changing the operating frequency in 100 kHz increments 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 fingernail.With Lectrosonics 400 Series receivers, a front panel LCD character display will indicate the correct transmit-ter switch settings once a clear frequency has been located with the scan function (if the receiver is so equipped).
UM400aLECTROSONICS, INC.10The wiring diagrams included in this section represent the basic wiring necessary for the most common types of microphones and other audio inputs. Some micro-phones may require extra jumpers or a slight variation on the diagrams shown.It is virtually impossible to keep completely up to date on changes that other manufacturers make to their products, thus you may encounter a microphone that differs from these instructions. If this occurs please call our toll-free number listed under Service and Repair in this manual or visit our web site at: www.lectrosonics.com5-Pin Input Jack WiringSM Equivalent Input Circuit Wiring10k1k54321To Virtual GroundAudio AmplifierBIASMICBIAS SELECTLINE INGND+30uF+6 VDCServo BiasPin 4 to Pin 1 = 0 V Pin 4 Open = 2 VPin 4 to Pin 2 = 4 V+To Limiter Control30uF750 Ohm100 Ohm2.7K200 Ohm+3.3uF100 OhmAudio Input JackThe Audio Input Jack for the UM400a is wired as shown below:PIN 1 Shield (ground) for positive biased electret lava-liere microphones. Shield (ground) for dynamic microphones and line level inputs.PIN 2 Bias voltage source for positive biased electret lavaliere microphones.PIN 3 Low impedance microphone level input for dynamic microphones. Also accepts hand-held electret microphones provided the microphone has its own built-in battery.PIN 4 Bias voltage selector for Pin 3. Pin 3 voltage (0, 2 or 4 volts) depends on Pin 4 connection.Pin 4 tied to Pin 1: 0 VPin 4 Open: 2 VPin 4 to Pin 2: 4 VPIN 5 High impedance, line level input for tape decks, mixer outputs, musical instruments, etc.
Frequency Synthesized UHF Belt-Pack TransmitterRio Rancho, NM 11Caution: 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.NOTE: This termination is required on VHF transmitters and will still work fine on UHF transmitters.Microphone Cord TerminationTA5F Connector AssemblyMic Cord Stripping Instructions
UM400aLECTROSONICS, INC.12Microphone RF BypassingWhen 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 wire-less 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.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 dif-ficulty with squealing, high noise, or poor frequency response, RF is likely to be the cause.The best RF protection is accomplished by installing RF bypass capacitors at the mic capsule. If this is not pos-sible, or if you are still having problems, capacitors can be installed on the mic pins 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 SCC330PAll Lectrosonics lavaliere mics are already bypassed and do not need any additional capacitors installed for proper operation.3 WIRE MIC2 WIRE MICCAPSULE CAPSULESHIELDAUDIOSHIELDAUDIOBIASAlternate locations for bypass capacitorsTA5FCONNECTORTA5FCONNECTORPreferred locations for bypass capacitors
Frequency Synthesized UHF Belt-Pack TransmitterRio Rancho, NM 13SHIELD TIP PIN 5 4 3 2 1 SLEEVE LINE LEVEL RCA or 1/4” PLUG A UDI O 1 2 3 4 5 T A5 F PLUG (This configuration handles input signal levels up to 3 V or 12 dBu before limiting and is fully compatible with other Lectrosonicstransmitters such as the LM or UM series. A 20 k resistor can be inserted in series with pin 5 for additional 20 dB attenuation (30 V or +32 dBu).)Compatible Standard Unbalanced Line Level Wiring DRAIN (BIAS)SOURCE (AUDIO)SHIELDCompatible with Servo Inputs and other Lectrosonics Transmitters:Works with Servo Inputs Only:Wiring Hookups for Different SourcesIn addition to the wiring hookups illustrated below, Lec-trosonics makes a number of cables and adapters for other situations such as connecting musical instruments (guitars, bass guitars, etc.) to the transmitter. These cables can be found in our UHF or Accessories cata-logs. Visit www.lectrosonics.com, or contact the factory for more information.A new “servo” input circuit is used on the UM400a and other models such as the SM Series where pin 4 is now a voltage selector pin. The diagrams in the section labeled “Works with Servo Inputs only” are specific to the UM400a transmitter and make wiring a Countryman B6 or E6 or a three wire microphone such as a COS-11 very quick and easy. However, these wirings will not work with older Lectrosonics transmitters such as the UM400, UM200, etc. If you need the two wire Countryman B6 or any three wire mic to work with both older transmitters as well as with the Servo input go to the section below, labeled, “Compatible with Servo Input and other Lectro-sonics Transmitters.” Sanken Cos-11 microphones, the Lectrosonics M150 and other three wire microphones to be used with the Servo input will require new wiring. If the wiring is not changed, they will have much higher output than usual and extra distortion at high levels. The reason is that the source follower wiring used in the older models is not compatible with the virtual ground in the Servo input. In the “Compatible with Servo Input and other Lectroson-ics Transmitters” section shows a compatible wiring that will work with all 5-Pin Lectrosonics transmitters. This wiring converts the three wire microphone to a two wire system without changing the audio quality. (The microphone polarity will be reversed so you may want to enable the phase switch on the Lectrosonics receiver.) This wiring is electrically equivalent to the easy wiring in the “Works with Servo Input only” section. All two wire mics (except the Countryman B6 and E6) such as the MKE-2 and the Lectrosonics M152 will work with the Servo input with no changes. The two wire setup is also shown in the third diagram below.
UM400aLECTROSONICS, INC.14ItemReplacement wire belt clipReplacment whip antennaReplacement Parts and AccessoriesUHF Transmitter Antenna SpecificationsAll Lectrosonic UHF transmitter antennas follow the color code specifications in the chart below to identify operating frequency block range. (The frequency block range is engraved on the ouside housing for each individual transmitter.)If a situation exists whereby the antenna is defective and the antenna cap is missing, refer to the following chart to determine the correct replacement antenna. BLOCK FREQUENCY CAP ANTENNA RANGE COLOR WHIP LENGTH20 512.000 - 537.500 Black 4.98”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 Grey 3.31”29 742.400 - 767.900 White 3.18”30 768.000 - 793.500 Black-w/Label 3.08”31 793.600 - 819.100 Black-w/Label 2.99”32 819.200 - 844.700 Black-w/Label 2.92”33 844.800 - 865.000 Black-w/Label 2.87”944 944.100 - 951.900 Black-w/Label (contact factory)Model/Part NumberLectrosonics #BCWireLectrosonics AMM (xx) - specify frequency block (xx)
Frequency Synthesized UHF Belt-Pack TransmitterRio Rancho, NM 15Before 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 CauseTRANSMITTER 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 connectedNO SOUND (OR LOW SOUND LEVEL), 1) Receiver output level set too low. RECEIVER INDICATES PROPER AUDIO 2) Receiver output is disconnected; cable is defective MODULATION 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 transmitter and receiver as it is being used. (Refer to Operating Instructions - Adjusting Gain) 2) Receiver output may be mismatched 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.” Reposition 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 or folded against housing. 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.Troubleshooting
UM400aLECTROSONICS, INC.16
Frequency Synthesized UHF Belt-Pack TransmitterRio Rancho, NM 17Operating frequencies: Block 21: 537.600 - 563.100 Block 22: 563.200 - 588.700 Block 23: 588.800 - 607.900 and 614.100 - 614.300 Block 24: 614.400 - 639.900 Block 25: 640.000 - 665.500 Block 26: 665.600 - 691.100 Block 27: 691.200 - 716.700 Block 28: 716.800 - 742.300 Block 29: 742.400 - 767.900 Block 30: 768.000 - 793.500 Block 31: 793.600 - 819.100 Block 32: 819.200 - 844.700 Block 33: 844.800 - 865.000 Block 944: 944.100 - 951.900Frequency selection: 256 frequencies in 100kHz stepsRF Power output: 100 mW (nominal)Pilot tone: 25 to 32 kHz frequency; 5kHz deviationFrequency stability: ± 0.002%Deviation: ± 75 kHz (max)Spurious radiation: 90 dB below carrierEquivalent input noise: –120 dBV, A-weightedInput level: Nominal 2 mV to 300 mV, before limiting. Greater than 1V maximum, with limiting.Input impedance: Dynamic mic: 300 Ohms Electret lavaliere: Input is virtual ground with servo adjusted constant current bias Line level: 2.7 k OhmsInput compressor: Dual envelope compressor, >30 dB rangeGain control range: 43 dB; semi-log rotary controlModulation indicators: Dual bicolor LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full modulation.Low frequency roll-off: –18 dB/octave; 35Hz to 150HzAudio frequency response (overall system): 32 Hz to 20 kHz (+/- 1dB)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 (TA5F)Antenna: Detachable, flexible wire supplied. 50 Ohm port allows connection to test equipment.Power Consumption: 80mABattery: Precision compartment auto-adjusts to accept any known alkaline 9 Volt battery. Battery Life: 5 hours (alkaline); 10 hours (lithium)Operating Temperature: -20 to +140 degrees FWeight: 6.3 ozs. including batteryDimensions: 3.1 x 2.4 x .75 inchesEmission Designator: 180KF3EThe FCC requires that the following statement be included in this manual:This device complies with FCC radiation exposure limits as set forth for an uncontrolled environment. This device should be installed and operated so that its antenna(s) are not co-located or operating in conjunction with any other antenna or transmitter.Specifications and Features
UM400aLECTROSONICS, INC.18Service and RepairIf your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnect-ing cables and then go through the Troubleshooting section in this manual.We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt anything other than the simplest repair. 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 RepairFor timely service, please follow the steps below:A. DO NOT return equipment to the factory for repair without first contacting us by email 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 A.M. to 4 P.M. (U.S. 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 dam-age to equipment that you ship. Of course, we insure the equipment when we ship it back to you.Lectrosonics USA:Mailing address: Shipping address: Telephone: Lectrosonics, Inc. Lectrosonics, Inc. (505) 892-4501 PO Box 15900 581 Laser Rd. (800) 821-1121 Toll-free Rio Rancho, NM 87174 Rio Rancho, NM 87124 (505) 892-6243 Fax USA USA Web: E-mail: www.lectrosonics.com sales@lectrosonics.comLectrosonics Canada:Mailing Address: Telephone: E-mail: 49 Spadina Avenue, (416) 596-2202 Sales: colinb@lectrosonics.com Suite 303A (877) 753-2876 Toll-free Service: joeb@lectrosonics.com Toronto, Ontario M5V 2J1 (877-7LECTRO) (416) 596-6648 Fax
Frequency Synthesized UHF Belt-Pack TransmitterRio Rancho, NM 19
UM400aman.inddMay 3, 2007581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • sales@lectrosonics.comLIMITED ONE YEAR WARRANTYThe 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.

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