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Day rate: $35.00
Overview:
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.
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