The Lectrosonics SMQV sub-miniature wireless transmitter incorporates Lectrosonics patented Digital Hybrid technology, in a package no bigger than a pager. The SMQV transmitter is miniature in size yet rugged enough to withstand rigorous daily use in the field or in studios.

The SMQV is identical to the SM transmitter and is capable of 256 user selectable UHF frequencies. The SMQV features variable output power, allowing the user to choose from 50, 100 and 250mW output. The audio input is a Switchcraft TA5M connection that is capable of -10dB or -20dB gain level. The non-corrosive, machined aluminum casing is splash proof and features an LCD display with membrane switch control panel. The LCD provides frequency and output gain level information while 3-LED indicators provide modulation and power status. The SMQV transmitter is powered with dual AA lithium, NiMH or alkaline batteries.

Lectrosonics patented Digital Hybrid technology revolutionizes wireless microphone transmission. Digital audio signal is converted and encoded for analog transmission, then decoded and converted back to digital audio at the receiver. The result is an exceptionally low noise floor as the compandor circuit is eliminated and clear audio reception is retained at greater distances.
The SMQV transmitter is completely compatible with all Lectrosonics Digital Hybrid wireless receivers, as well as older Lectrosonics analog receivers.

Variable, Selectable Output Power
The SMQV features selectable 50, 100 and 250mW output power.

Miniature Design
The SMQV transmitter features a profile no bigger than a pager. The miniature design allows for a variety of mounting possibilities in film, video, theater, performances, etc.

Digital Hybrid Architecture
Lectrosonics incorporates digital and analog audio technology to enhance range and eliminate the noise associated with compandor circuits.

Backwards Compatibility
The SMQV transmitter is completely compatible with all current Lectrosonics Digital Hybrid receivers and older Lectrosonics analog receiver models as well.

Locking TA5-Male Connection
A locking TA5M input is compatible with Lectrosonics and third party microphones and cables. The input accepts line and microphone level signal.

Splash Proof Enclosure
The polished aluminum enclosure is splash proof and ideal for use in rain or nearby water.

LCD Display
The LCD provides level and frequency information. A membrane switch panel features Level and Audio mode buttons and Up/Down toggle buttons.

Extended Battery Life
The SMQV transmitter uses dual AA alkaline, NiMH or lithium rechargeable batteries.

The Lectrosonics SR Dual-Channel Slot Mount ENG Receiver features two independent digital hybrid wireless UHF receivers in a single lightweight body. It’s designed for use in the wireless receiver slots found on professional video cameras, and it can be adapted for a variety of other field audio tasks as well.

With a pair of Lectrosonics transmitters, the SR makes for a formidable wireless solution for the discerning production professional who needs to reliably capture broadcast ready audio.

The supplied SREXT adapter enables you to use the SR for stand-alone use, such as in an ENG audio bag with a battery distribution system.

Removable Antennas
With this model of SR receiver you can easily remove the antennas when storing, or replace them with right-angle antennas when necessary.
Two Powerful Digital Hybrid Receivers in One Compact Unit
The SR features two of Lectrosonics acclaimed Digital Hybrid receivers which deliver compandor-free crystal clear audio.

Easy to Use User Interface
The SR Receiver features a simple 4 button interface with an LCD display. You can scan for open frequencies and carry out all of the commands with a few button pushes.

Please note: There are 3 different adapter plates that are available separately which enable you to mount the SR receiver into either Panasonic, Sony, and other camera slots, or to use the SR receiver without a camera, such as in a field audio bag. The unit comes standard from our rental department with the stand-alone SREXT adapter which enables you to use the SR for stand-alone use. If other adapters are needed please contact regarding availability.

100 mW RF power for long range

256 synthesized frequencies

Compatible with Digital Hybrid Wireless™ and analog receivers

Power switch can be locked out or used as a mute switch

VariMic™ capsule with attenuator and tone controls

Rugged, ergonomically designed machined PVC housing

The UT400 Digital Hybrid Wireless™ is a state-of-the-art, 100mW handheld transmitter incorporating many advanced features in order to give the user a wide range of possibilities for high-quality speech and vocal performance. The proprietary VariMic™ element allows custom tailoring of the microphone’s frequency response, while a digitally-controlled input limiter ensures distortion-free audio over a very wide dynamic range.
Along with providing peerless audio quality in native 400 Series mode, the Digital Hybrid Wireless™ technology found in the UT400 includes compatibility modes to emulate a wide range of receiver types, including Lectrosonics 200 Series, 100 Series systems and IFB receivers.

At the heart of the UT is the VariMic™ preamp, included with each of the three different electret condenser capsules. The elements are mounted on a tuned suspension to reject handling noise, while a generously sized windscreen prevents popping and breath noise. The preamp board also includes three tone controls and one variable attenuator, allowing the user to tailor the microphone’s audio without changing the capsule.

UH400A Digital
UH200 Analog
The UH400A Is A Digital Hybrid Synthesized UHF Plug-On Transmitter Compatible With All Receivers In The 400, 200 And 100 Series Product Groups. The Dsp-Base Design Allows The Transmitter To Operate In Its Native Digital Hybrid Wireless™ Mode, Or In Several Alternate Modes That Are Compatible With Analog Receivers. A Unique Multi-Voltage Phantom Power Feature Allows The Transmitter To Be Used With Any Microphone, Including High Current Condenser Types, Expanding Its Usefulness In High-End Applications Such As Motion Picture Production.
-Feature Highlights
• Digital Hybrid Wireless™ Technology
• Converts Microphones With XLR Jacks To Wireless Operation
• Selectable 5, 15 And 48 Volt Phantom Power Plus Off Position
• 256 Synthesized UHF Frequencies
• 100 Mw Output Power
• Dual Envelope Input Limiter
• Dual Bicolor Leds Indicate Four Different Levels For Accurate Gain Adjustment
• Dsp Based Pilot-Tone Signal
• Isolator Protected Output Stage
• Rugged Machined Aluminum Housing
• Compatible With 100, 200 Or 400 Series Lectrosonics Receivers
The Transmitter Provides 256 Frequencies In Standard Lectro Frequency Blocks, Selected With Two Rotary Switches On The Side Of The Housing. The Input Amplifier Uses An Ultra Low Noise Op-Amp For Quiet Operation. It Is Gain Controlled With A Wide Range Dual Envelope Limiter Which Cleanly Limits Input Signal Peaks Over 30db Above Full Modulation.
When Used With A Digital Hybrid Receiver, A 24-Bit A-D Converter Digitizes The Audio, Followed By Filters To Remove Supersonic Audio Above 21khz; The Resulting Signal Is Then Encoded With A Proprietary Algorithm To Produce An Analog Data Signal For Rf Transmission. The Rf Transmission Is An Optimized Fm System With +/-75khz Wide Deviation For A High Signal To Noise Ratio.
The Antenna Is Formed Between The Lower Housing Of The Transmitter And The Body Of The Microphone Attached. It Functions As A Dipole Radiator When Attached To A Handheld Microphone And Somewhat Like A Ground Plane Antenna When Connected Into A Mixer.
Phantom Power Is Selectable For 5v, 15v And 48v For Electret Condenser Microphones, Or Can Be Turned Off For Use With Dynamic Microphones And Modest Line Level Inputs. The Selector Switch Is Located On A Recessed Control Panel, With A Flush Switch Handle To Prevent Inadvertent Settings.
The UH400 Is Powered By A Single 9 V Battery And Provides A Full 100mw Output Over The Life Of The Battery For Extended Operating Range.
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-Digital Audio Systems
Without Question, Digital Audio Systems Produce Stellar Sound Quality Very Inexpensively. Advances In Process ing Speeds And Storage Media In Recent Years Have Made Digital Techniques The Undeniable Choice For Professional Audio Applications.
-Analog Rf Links
While Digital Audio Systems Are Obviously Superior To Analog Audio Systems, Rf Transmission System Designs Are Challenged By Limited Bandwidth. Wireless Micro phone Systems Operate In Designated Channels Defined By Spectral Bandwidth. The Government In Almost Every Country Regulates The Channel Spacing And Imposes A Spectral Mask Limiting The Amount Of Rf Energy That Can Be Transmitted Above And Below The Carrier. The Transmit ted Energy Must Remain Inside The Spectral Mask Defined By The Government In The Country Where The Wireless System Is To Operate.
All Else Being Equal, A Digitized Audio Signal Occupies A Good Deal More Bandwidth Than The Original Audio Signal. The Same Applies To Digital And Analog Rf Signals. A Digital Transmission Over The Air Requires Some Combina tion Of Additional Power, More Rf Bandwidth And/Or Compression Of The Audio Data To Achieve Adequate Oper ating Range And Keep The Energy Inside The Defined Spectral Mask. Because Of This, Digital Wireless Micro phones Typically Lack The Operating Range Of Conventional Fm Systems.
With Regard To Using Rf Power And Spectrum Efficiently, An Analog Rf Link Has Many Advantages In Wireless Mic Systems, Among Them Long Battery Life, Excellent Range, And The Ability To Use Many Systems In Close Proximity Without Interference.
-Digital Hybrid Wirelesstm
The Lectrosonics Digital Hybrid Wireless System* Uses Innovative Technology To Combine The Advantages Of Digi tal Audio With The Advantages Of Analog Rf Transmission, Thus Delivering The Excellent Range Of An Analog System And The Superior Sound Quality Of A Digital System. A Proprietary Algorithm Encodes The Digital Audio Informa tion Into An Analog Format Which Can Be Transmitted In A Robust Manner Over An Analog Fm Wireless Link. The Receiver Employs The Latest Filters, Rf Amplifiers, Mixers And Detector To Capture The Encoded Signal And A Dsp Recovers The Original Audio.
This Unique Digital/Analog Hybrid Technique Has Some Very Beneficial Properties. Because The Information Being Transmitted Is Digitally Encoded, Immunity To Noise Is Much Higher Than A Compandor Can Offer. Because The Encoded Audio Is Sent In Analog Format, Spectral And Power Efficiency And Operating Range Are Not Compro mised. Under Weak Rf Conditions, The Received Signal Degrades Gracefully, Like An Analog System, Delivering As Much Usable Audio As Possible At Maximum Range. Be cause The Audio Is Not Companded, No Compandor Artifacts Are Present At Any Audio Or Rf Signal Level.
*Us Patent Pending
-Dsp-Based Pilot Tone
The 400 Series System Design Utilizes A Dsp Generated Ultrasonic Pilot Tone To Control The Receiver Audio Muting (Squelch). Brief Delays At Turn-On And Turn-Off Eliminate Thumps, Pops Or Other Transients That Can Occur When The Power Is Switched On Or Off. The Pilot Tone Frequency Is Different For Each Of The 256 Frequencies In The Tuning Range Of A System (Frequency Block.) This Eliminates Squelch Problems In Multi-Channel Systems Where A Pilot Tone Signal Can Appear In The Wrong Receiver Via Inter-Modulation Products. The Dsp Generated Pilot Tone Also Eliminates The Need For Fragile Crystals Allowing The Re­ceiver To Survive Shocks And Mishandling Much Better Than Older Analog-Based Pilot Tone Systems.
-Dsp Emulations
While The UH400 Sounds Best When Used With A Lec trosonics 400 Series Receiver, It Also Offers Backward Compatibility With Earlier Technologies, Including The Lec trosonics 100 And 200 Series And Another Brand Of Wireless. The Selected Compatibility Mode Is Indicated At Power Up By Blink Sequences Of The Audio Level Leds. The Compatibility Is Set By A Series Of Frequency Switch Settings And Power Switch On/Off Cycles.
-Outstanding Audio Performance
The Audio Performance Of The Overall System Sets A New Standard For Wireless Microphone Systems, As Is Depicted In The Following Graph. Distortion In The Overall System Is Extremely Low Over The Entire Usable Audio Band.
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The Input Includes A Wide Range Limiter With 30 Db Of Clean Headroom, A 24-Bit A-D Converter Sampling At 88.2 Khz, Followed By Dsp Filters To Remove Supersonic Audio Above 21 Khz. The Resulting Signal Is Then Encoded With A Proprietary Dsp Algorithm To Produce An Encoded Data Signal For Rf Transmission. The Encoded Data Signal Is Mixed With A Dsp Derived Pilot Tone Signal And Sent To The Vco. The Modulated Output Of The Vco Is Then Delivered To The Output Stage.
The Rf Output Stage Includes A Rf Component Called An “isolator” To Prevent Im Products From Occurring In The Output Amplifier. This Unique Component Functions Some what Like A One-Way Rf Check Valve, Allowing The Output Signal To Be Transmitted, But Not Allowing External Rf Signals Back Into The Output Amplifier. The Isolator Simpli fies Multi-Channel Frequency Coordination When Multiple Units Are Operated In Close Proximity To One Another.
The Input Jack Is A Standard XLR Female That Accepts Input From All Types Of Dynamic And Electret Condensor Microphones. The Input Level Is Indicated By Dual-Color Leds Next To The Connector. As The Input Level Increases, The Leds Progress From Green To Red To Indicate The Level And The Onset Of Limiting. Battery Status Is Indicated By A Dual-Color Led, Also On The Top Panel. As The Battery Voltage Drops, The Led Will Change From Green To Red, And Then Start Blinking As A Warning When The Battery Is Near The End Of Its Life.
Phantom Power Is Available At Three Different Levels, Plus An “off” Position To Operate With Any Type Of Microphone, Ranging From Standard Dynamic Models To High Current Condensor Models. The Phantom Power Selector Switch Is Flush Mounted To Prevent Unintentional Adjustments.
The Input Coupler, Housing And Panels Are Constructed Of Machined Aluminum With Anodized And Power Coated Finishes For The Ruggedness Needed In The Field.

The UM250C is a 250 mW synthesized UHF transmitter with a versatile feature set to meet the need for extended operating range with a variety of microphones and other audio equipment. The high output power is especially useful for special applications, for example, configuring an audio “relay” for long range coverage on a golf course, or to feed program audio to a remote speaker tower in a large outdoor sound system. The unit is compatible with all 200 Series Lectrosonics receivers.

Feature Highlights
• 250 mW output power
• 256 synthesized UHF frequencies
• Circulator-Isolator in output stage
• Wide range input limiting
• Dual LEDs for accurate gain adjustment
• Dual-band compandor for low
noise and distortion
• Variable low frequency roll-off adjustment
• Pilot-tone signal for audio squelch control
• Spring loaded belt clip
• Rugged machined aluminum housing

Lectrosonics SMa

Super-Miniature Digital Hybrid Wireless™ UHF Belt Pack Transmitter
Digital Hybrid Wireless™ Technology*
LCD and membrane switch control panel
256 synthesized UHF frequencies
100 mW output power
Wide input dynamic range
Four-level audio metering
DSP based pilot-tone signal
Circulator/Isolator output stage
Splash-proof, machined aluminum housing
Non-corrosive, superhard finish
Includes water-resistant elastic holster with non-corrosive belt clip

Lectrosonics sets a new standard for size, power, reliability and functionality with the ultra miniature SM transmitter. Not much bigger than two AA batteries, the 100 mW SM packs all user controls onto an easy to operate control panel that includes an LCD, four membrane switches for adjusting operating frequency and modulation level, plus both modulation and power indicators.
The switches can also be used to set compatibility modes, allowing the SM to work with all of Lectrosonics Digital Hybrid Wireless receivers, plus Lectrosonics 200 Series and 100 Series analog products (and even analog receivers from some other manufacturers), and Lectrosonics IFB systems.
Switching power supplies throughout the design allows nearly six hours of operation using a single AA lithium battery, or 4.5 hours with a rechargeable 2500 mAh NiMH battery. Even an alkaline AA will run for about 1.5 hours.

or

Lectrosonics MM400A

MM400A Digital Hybrid Wireless™ is a revolutionary new design that combines 24-bit digital audio with an analog FM radio link to provide outstanding audio quality and the extended operating range of the best analog wireless systems. The design overcomes channel noise in a dramatically new way, digitally encoding the audio bitstream in the transmitter and decoding it in the receiver, yet sending the encoded information via an analog FM wireless link. This proprietary DSP algorithm eliminates a compandor circuit and its artifacts, and preserves the RF spectral footprint of analog FM designs to simplify multi-channel coordination with exisiting analog wireless systems.

The UM200C transmitter is a high performance synthesized UHF design that offers the frequency agility needed to alleviate interference and frequency coordination problems in travelling applications. Interference caused by television broadcasts and other radio equipment can easily be avoided with 256 available frequencies selected in 100kHz steps with two rotary switches on the side panel.

or

The UM400C belt-pack transmitter implements the latest digital/analog hybrid technique in a classic Lectro belt-pack transmitter. A 5-pin input jack provides taps for low impedance dynamic mics, electret lavalier mics with positive or negative bias and line level inputs. Input gain is adjustable over a 43 dB range to perfectly match the audio input level for optimum modulation, minimum distortion and maximum signal to noise ratio. Input levels are accurately indicated by two LEDs on the control panel

The Lectrosonics UM100 multi-frequency, belt-pack transmitter. The UM100 combines over 80 years of engineering experience with the very latest components, in a design that addresses the most demanding professional applications.

The UM100 is a rugged, machined aluminum package with a removable, spring
loaded belt clip. The input section provides a correct input tap for virtually any microphone or line level audio source. 5 Volts of bias voltage is available to power electric mics with either positive or negative bias. Level indicating LEDs are provided on the control panel to make level settings quick and accurate, without having to view the receiver. The battery compartment accepts any 9 Volt alkaline battery and makes a positive connection via self-adjusting contacts. The antenna is a fixed 1/4 wavelength flexible bronze cable.

The Lectrosonics 100 system was designed to operate with the new generation of DV camcorders, offering an ultra-compact receiver and modest cost, yet preserving the performance that has become the hallmark of Lectrosonics.

The system offers 256 selectable frequencies over a 25.6 MHz band to avoid interference from local RF sources. The UCR100 receiver is highly sensitive and the matching transmitters provide a full 100mW of output power. The result is exceptional operating range and freedom from drop outs.

The Lectrosonics 100 System Receiver and companion transmitter are designed expressly for the most discriminating videographer and for other wireless applications needing superior audio quality, flexible operation, and
outstanding durability. The compact size of the receiver provides ease of integration with most any compact video camera.

The Lectrosonics UCR411 Wireless Microphone Kit is an exclusive for B&H customers. The kit pairs the UCR411 with the SMV bodypack transmitter. The system combines digital hybrid technology, diversity reception and rugged components to achieve pristine audio signals at long range. The UCR411 offers over 256 selectable frequencies over a 25.6MHz band to avoid interference from local RF sources. This kit also includes the M152 omnidirectional lavalier microphone.

Product Highlights
Frequency Block 21
UCR411 Receiver
SMV Super-Miniature Transmitter
M152 Omnidirectional Lavalier

The UCR211 Receiver Provides Professional Performance And A Versatile Feature Set In This High-End Wireless Receiver. The Design Offers A Compact Package For Camera Mounted Applications In Eng And Field Production. The Proprietary Tracking Front-End Filters, High Current Rf Amplifiers And Mixers And Saw Filters In The First If Strip Provide Solid Rf Performance. The LCD Display Provides A Full-Information Display And Automatic Rf Site Scanning To Locate Clear Operating Frequencies. The UCR211 Is Compatible With All 200 Series Lectrosonics Wireless Transmitters.

The Powerful User Interface Is A Multi-Function LCD Display That Provides A Variety Of Windows For Setup And Operation. The Main Window Provides Full System Operating Information Including Transmitter And Receiver Battery Levels, Rf And Audio Levels And Diversity Antenna State. Other Windows Provide Frequency And Level Settings, A 1 Khz Test Tone For Level Matching And A Unique Rf Spectrum Analyzer. The Spectrum Analyzer Will Automatically Tune The Receiver Across Its Entire Bandwidth And Display The Results In A Scrollable Window To Identify Signals That Are Present And Clear Operating Frequencies.

Microprocessor Control Is At The Heart Of The UCR211. Internal Functions Such As Diversity Antenna Phase And Squelch Activity Are Controlled By Internal Firmware That Analyzes A Variety Of Conditions To Optimize Performance.

Feature Highlights
- Battery Or External DC Power
- Graphics Type Backlit LCD Display
- Smartsquelch™ Circuitry
- Smartdiversity™ Circuitry
- 256 Selectable UHF Frequencies
- Auto Tracking Front-End Filters
- Constant Group Delay Saw Filter
- Digital Pulse Counting Detector
- Dual-Band Audio Compandor
- Pilot Tone Controlled Squelch
- Balanced XLR Audio Output
- Aluminum Construction
- -50dbu To +10dbu Output Levels

Power: (2) 9 Volt Batteries Or External 10-18VDC

The UCR201 is a portable, high performance, tripleconversion, frequency synthesized, UHF receiver fully compatible with all Lectrosonics 200 series transmitters.
The RF performance is extremely stable over a very wide temperature range, making the UCR201 perfectly suited to the rough environmental conditions found in the field. The proprietary audio processing includes a dualband compandor for very low distortion and a superior signal to noise ratio. The Smart Squelch™ system is operated by a separate pilot tone and mutes the audio output directly at the output connector.

From Lectrosonics, the Wideband Venue Receiver Master (VRM) unit is designed for use with the Lectrosonics Venue Wireless System. The system delivers the stability of their patented Digital Hybrid Technology with the convenience of multi-transmitter operation without multiple receivers.

Designed primarily for fixed installation, the system consists of the Venue Receiver Master (VRM) which accommodates up to 6 VRT or VRS receiver modules (sold separately), enabling up to 6 transmitters to be used simultaneously. The VRT and VRS receiver modules feature diversity reception and 256 user selectable UHF frequencies.

Digital Hybrid Technology eliminates the compandor circuit and all associated artifacts while still operating over traditional FM frequencies. In addition to minimal noise, the system is also backward compatible with Lectrosonic analog and Digital Hybrid transmitters. The VRM features 6 discrete audio outputs for each receiver module via 3-pin XLR connectors. Additional features include a comprehensive LCD display, USB and RS-232 ports.

The Lectrosonics Venue Wireless System covers every conceivable necessity for professional multi-transmitter wireless operation. The system will prove worthy for touring, theatrical performances, presentations, and more.

Multiple Transmitter Operation
The VRM accepts up to 6 VRS or VRT receiver modules, enabling up to 6 transmitters to be used simultaneously. Each module features diversity reception and 256 user selectable frequencies.

Digital Hybrid Technology
24-bit digital audio stream is decoded at the receiver resulting in greater operating range without noise and artifacts caused by analog compandor circuits. Digital Hybrid operation also allows for backward compatibility with older analog Lectrosonic transmitters as well as later Digital Hybrid compatible models.

Zero Gain Antenna Amplifiers
Zero-gain antenna amplifiers allow internal distribution and pass through to other VRM units.

Selectable Diversity Modes
Each individual VRS and VRT receiver module is capable of phase-diversity operation. Ratio-diversity and frequency-diversity operation can be achieved with 2 or more adjacent receivers.

Comprehensive Display and Control
A comprehensive LCD display provides a thorough list of readings including transmitter battery life, diversity status, noise reduction and more.

Extensive DSP
Extensive DSP control is achieved with LecNet2 software (included).
USB and RS232 Ports
Both USB and RS-232 ports provide direct connectivity to PCs for remote operation and extensive control over DSP features.

The UCR211 receiver provides professional performance and a versatile feature set in this high-end wireless receiver. The design offers a compact package for camera mounted applications in ENG and field production. The proprietary tracking front-end filters, high current RF amplifiers and mixers and SAW filters in the first IF strip provide solid RF performance. The LCD display provides a full-information display and automatic RF site scanning to locate clear operating frequencies. The UCR211 is compatible with all 200 Series Lectrosonics wireless transmitters.

The UM250C is a 250 mW synthesized UHF transmitter with a versatile feature set to meet the need for extended operating range with a variety of microphones and other audio equipment. The high output power is especially useful for special applications, for example, configuring an audio “relay” for long range coverage on a golf course, or to feed program audio to a remote speaker tower in a large outdoor sound system. The unit is compatible with all 200 Series Lectrosonics receivers.

The UCR411 receiver provides professional performance and a versatile feature set in a compact design for field and location production. All settings are made from the front panel with a powerful LCD interface, making the unit ideal for use in Quad Paks, on sound carts, in portable bags and in rack mount multi-couplers. To alleviate interference problems in an increasingly congested RF spectrum, an RF spectrum analyzer is built into the receiver. The receiver tunes across its 25.6 MHz tuning range and records RF activity with markers on the LCD screen. Finding clear operating frequencies is a quick, simple process. The UCR411 is compatible with all 400 Series Lectrosonics wireless transmitters and can be powered with internal 9V batteries or external DC.

The UM400C belt-pack transmitter implements the latest digital/analog hybrid technique in a classic Lectro belt-pack transmitter. A 5-pin input jack provides taps for low impedance dynamic mics, electret lavalier mics with positive or negative bias and line level inputs. Input gain is adjustable over a 43 dB range to perfectly match the audio input level for optimum modulation, minimum distortion and maximum signal to noise ratio. Input levels are accurately indicated by two LEDs on the control panel.

The UCR211 receiver provides professional performance and a versatile feature set in this high-end wireless receiver. The design offers a compact package for camera mounted applications in ENG and field production. The proprietary tracking front-end filters, high current RF amplifiers and mixers and SAW filters in the first IF strip provide solid RF performance. The LCD display provides a full-information display and automatic RF site scanning to locate clear operating frequencies. The UCR211 is compatible with all 200 Series Lectrosonics wireless transmitters.

The UM200C transmitter is a high performance synthesized UHF design that offers the frequency agility needed to alleviate interference and frequency coordination problems in travelling applications. Interference caused by television broadcasts and other radio equipment can easily be avoided with 256 available frequencies selected in 100kHz steps with two rotary switches on the side panel.

Compact Digital Hybrid Wireless Receiver The UCR401 is a high performance compact UHF wireless microphone receiver for mobile applications such as ENG and film production. The compact size, battery and external power and rugged attached antennas are ideal for video camera mounted use. Power is provided by two AA batteries, typically NiMH rechargeable types, or external DC supplied via a jack on the rear panel. Microprocessor control enables SmartSquelch and SmartDiversity advanced reception techniques to minimize noise and dropouts in all conditions. The receiver differentiates between close and distant operation and adjusts the squelch threshold automatically.

The UM400 belt-pack transmitter implements the latest digital/analog hybrid technique in a classic Lectro belt-pack transmitter. A 5-pin input jack provides taps for low impedance dynamic mics, electret lavalier mics with positive or negative bias and line level inputs. Input gain is adjustable over a 43 dB range to perfectly match the audio input level for optimum modulation, minimum distortion and maximum signal to noise ratio. Input levels are accurately indicated by two LEDs on the control panel.

The UCR190 receiver is comprised of six major functional subsystems: the RF front-end amplifier, the double bal- anced mixer/local oscillator, the first IF filter, the second IF filter and audio demodulator, the compandor, and the balanced microphone level output circuit.

The RF front-end amplifier consists of a 5-section helical resonator for high selectivity. Between the first and second helical resonators, is a low noise GAsFET amplifier. These amplifiers are designed to provide only enough gain to make up for the inherent loss through the helical resonators. This combination of low front-end gain, coupled with the extremely high selectivity of the cascaded helical resonators results in no overloading, even on extremely strong signals. Rejection of out of band signals is maximized, and intermodulation products are suppressed.

The mixer stage consists of a high level double balanced diode mixer. The oscillator is biased from a regulated supply, and includes Automatic Frequency Control (AFC) yielding stable performance over the entire life of the battery. The local oscillator crystal operates at approximately 16 MHz, and can be adjusted above and below the nominal frequency in order to place the 21.4 MHz IF in the center of the crystal filter’s narrow passband. The high selectivity of the IF crystal filter stage further minimizes the possibility of interference from signals on adjacent frequencies.

The second IF filter and the audio demodulator, as well as the squelch and RF output LED drive are provided by one monolithic integrated circuit. The second IF filter is centered on 1MHz, and drives a double tuned quadrature type FM demodulator. The squelch circuit is a supersonic noise detector type and is factory set for a -20dB SINAD level (about .5uV). The squelch level is regulated and temperature compensated to maintain a consistent squelch level under all conditions.

The Dual Band Compandor is driven by a multiple pole active low-pass filter. The filter ensures that supersonic noise will not cause the compandor to increase gain incorrectly. This filter also drives the -20dB and 0dB modulation LEDs.

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 190 system introduces an entirely new approach to solving this basic problem, called “dual-band companding.”

The UM190B transmitter is a rugged, machined aluminum package with a removable, spring loaded belt clip. The input section provides a correct input tap for virtually any micro- phone or line level audio source. 5 Volts is available on the input connector to power electret mics with either positive or negative bias. Level indicating LEDs are provided on the control panel 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. The antenna is a detachable, locking 1/4 wavelength flexible wire that connects to a 50 Ohm port on the transmitter.