Lectrosonics UH400TM Wireless Plug-On Transmitter for Measurement Microphones

Lectrosonics UH400TM
Wireless Plug-On Transmitter for Measurement Microphones

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Lectrosonics UH400TM

Any measurement microphone can be converted to wireless operation. Phantom power (5, 15 or 48 volt) is selected on the transmitter control panel allowing the transmitter to be used with any microphone, including high current condenser types. The unit is powered by a single 9 volt battery, with a full 100 mW RF output over the life of the battery, extending the operating range for large outdoor areas.

The XLR input coupler is an ingenious design, spring loaded to maintain the secure, noise-free connection to the microphone. The antenna is formed between the microphone body and the housing of the transmitter. An insulator just below the input coupler separates the two antenna "halves" creating a highly efficient dipole design.

Specifications

Frequency selection: 256 frequencies in 100 kHz steps
RF Power output: 100 mW (nominal)
Pilot tone: 25 to 32 kHz; 5 kHz deviation (in the 400 Series operating mode)
Frequency stability: ± 0.002%
Deviation: ± 75 kHz (max)
Spurious radiation: 60 dB below carrier
Equivalent input noise: –118 dBV (A-weighted)
Input level: Nominal 2 mV to 300 mV, before limiting. Greater than 1V maximum, with limiting.
Input impedance: 1k Ohm
Gain control range: 43 dB; semi-log rotary control
Modulation indicators: Dual bi-color LEDs indicate modulation of -20, -10, 0, +10dB referenced to full modulation
Controls: Power/Phantom “ON-OFF” switch; Phantom voltage selector switch; Audio input gain knob; Two 16-position rotary switches adjust transmitter frequency
Audio Input Jack: Standard 3-pin XLR (female)
Phantom Power Selector: 5V @ 18 mA max., 18V @ 15 mA max. and 48 V @ 15 mA max., plus “OFF”
Antenna: Housing and attached microphone form the antenna
Battery: Precision compartment auto-adjusts to accept any known alkaline 9 Volt battery. (We’ve tried 243 different ones.)
Battery Life: 4.5 hours (alkaline); 12 hours (lithium); 5 hours (approx.) with NiMH rechargeable (battery life varies with the phantom power selection)
Weight: 6.6 oz (including lithium 9V battery)
Dimensions: 4.18" x 1.65" x 1.58"

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