Lectrosonics UM 400 Digital Hybrid Wireless Kit

Rent for $75.00 per day

Watch Audio Basics: Location Mics covering wireless microphone systems, techniques + etiquette.

SKU: AUD-4800A Categories: , ,


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 transmitter is paired with a UCR411A receiver.


• 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


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


• Lectrosonics UM400 Transmitter
• Lectrosonics UCR411 Receiver
• Lavalier mic (either Tram, Sanken, or Countryman – request if you have preference)
• Spare batts.
• Mounting plate for receiver