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HomepageMicrophonesWireless Microphones › Lectrosonics UM400a
Lectrosonics UM400a

The UM400a implements the latest Digital Hybrid Wireless® technology in a classic Lectrosonics 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 innovative servo bias input on the standard 5-pin connector provides a programmable, regulated voltage to accommodate a wide variety of electret microphones

The latest digital/analog hybrid technique is presented
in a classic Lectrosonics wireless belt-pack transmitter. 24-bit digital audio is combined with optimized FM to cre- ate unprecedented audio quality and RF performance. The RF transmission is an aggressively optimized FM system with +/-75kHz wide deviation for a high signal to noise ratio. The overall system delivers full bandwidth audio frequency response up to 20kHz and the operating range of the finest analog wireless systems.

The innovative servo bias input on the standard 5-pin connector provides a programmable, regulated voltage to accommodate a wide variety of electret microphones. It is no longer necessary to install resistive pads for some mics to prevent overload of the input stage, divide the bias voltage down for some low voltage mics, or reduce the limiter range at minimum gain settings. To simplify wiring connectors, a single configuration for all microphones is now available for the UM400a transmitter input, and an alternate wiring configuration works well with all 5-pin inputs on Lectrosonics transmitters.

Compatibility with earlier analog Lectrosonics receivers and even some receiver models from other manufactur- ers is provided by custom firmware emulations built into the DSP code. A simple procedure using the frequency and power switches selects the desired operating mode.

Operating Frequencies (MHz):
  • Block 470: 470.100 - 495.600
  • Block 19: 486.400 - 511.900
  • Block 20: 512.000 - 537.500
  • Block 21: 537.600 - 563.100
  • Block 22: 563.200 - 588.700
  • Block 23 lower: 588.800 - 607.900
  • Block 23 upper: 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 (export only)
  • Block 28: 716.800 - 742.300 (export only)
  • Block 29: 742.400 - 767.900 (export only)
  • Block 944: 944.100 - 951.900
  • Features
  • 256 synthesized UHF frequencies
  • 100 mW output power
  • DSP controlled dual envelope input limiter
  • DSP emulations for analog compatibility
  • Servo bias input preamp
  • DSP based pilot-tone signal
  • Circulator/Isolator output stage
  • Adjustable low frequency roll-off
  • Specifications
  • Frequency selection: 256 frequencies in 100kHz steps
  • RF Power output: 100 mW (nominal)
  • Pilot tone: 25 to 32 kHz; 5kHz deviation
  • Frequency stability: ┬▒ 0.002%
  • Deviation: ┬▒ 75 kHz (max)
  • Spurious radiation: 90 dB below carrier
  • Equivalent input noise: -120 dBV (A-weighted)
  • Input 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 Ohms
  • Input limiter: Dual envelope "soft" limiter; greater than 30 dB range
  • Gain control range: 43 dB; semi-log rotary control
  • Modulation indicators: Dual bicolor LEDs indicate modulation of
  • -20, -10, 0 and +10 dB referenced to full modulation
  • Audio Performance (overall system) Frequency Response: 32 Hz to 20 kHz (+/-1dB)
  • THD: 0.2% (typical)
  • SNR at receiver output:
  • Controls: Two position "ON-OFF" power switch, Audio input gain knob, Low frequency roll-off pot on side panel, Two 16-position rotary switches adjust frequency
  • Audio Input Jack: Switchcraft 5 pin locking (TA5F)
  • Antenna: Detachable, flexible wire supplied, 50 Ohm port allows connection to test equipment
  • Battery: Precision compartment auto-adjusts to accept any known 9 Volt battery
  • Battery Life: 5 hours (alkaline); 10 hours (lithium)
  • Weight: 6.98 ozs. - 198 grams (including battery & antenna)
  • Dimensions: 3.17 x 2.48 x .84 inches
  • Emission Designator: 180KF3E
  • Reviews
    Price *
    $2379.00
    $1818.00
    Free shipping in Canada. Conditions
    Additional information
    For more information about the UM400a, please visit the website of Lectrosonics
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