Lapel System - ULM18 Directional Microphone

  • ClearScan automatically finds the clearest channel
  • EZsync one-step channel setup
  • ULM18 directional lavalier microphone
  • 14 hour battery life from two AA alkaline
  • Rugged metal transmitter
  • Metal receiver chassis with optional rack mount

The R300-L is a robust UHF wireless bodypack system, suitable for any application where the convenience of a wireless lavalier microphone is required. The system's BP-300 rugged metal bodypack transmitter is simple to use, and is powered by two AA batteries. Included with the system, the ULM18 is a high quality directional (cardioid) condenser lavalier microphone suitable for sound reinforcement or recording of voice, and allows users the convenience of a hands-free presentation or performance experience. Exceptionally useful for sound reinforcement applications, the ULM18’s directional cardioid polar pattern reduces sound system feedback potential when used properly. The receiver's dual antenna diversity helps avoid signal dropouts, and its durable metal frame and chassis can either be used on a tabletop, or rack-mounted with optional rack mounting hardware.


Antennas Flexible TNC 1/2 Wave
Audio Frequency Response 80 Hz - 18kHz +/- 2dB
Balanced Line Level Output (RMS Adjustable) 10 - 100mV

Battery Life 14 Hours with (2) AA alkalines typical
Case Material Metal
Connector Type 1/4 inch unbalanced, 3-Pin XLR balanced
Controls On/Off, Set, Up, Down, Sync
Distortion (@ 1 kHz, 40 kHz deviation) less than 1.0, 0.4 typical%
Diversity True Antenna
Dynamic Range greater than 95 dBdB
Element ULM18 Directional Microphone
Family R300
Number of Channels 32 Per Band, 8 Simultaneous
Operating Temperature Range 5º - 45º C (41º - 113º F)
Polar Pattern Cardioid
Power Requirement 12-16 VDC, 500 mA max
Power Supply 12 VDC, 500 mA max
Receiver Type Synthesized PLL
RF Frequency Range 16MHz
RF Output 8 mW Typical
RF Sensitivity (12 dB SINAD) less than 1.0uV
Signal-to-Noise Ratio (A-weighted) greater than 100 dBdB
Squelch Tone code plus Amplitude

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Complementary Products


Name Language Size Date
R300 Brochure EN 561KB Jan 10, 2011 Download
Microphone Catalog EN 5.69MB Jul 7, 2016 Download
R300 Folleto Español ES 3.41MB Sep 27, 2012 Download
Name Language Size Date
R300 Engineering Data Sheet EN 908KB Oct 12, 2015 Download
ULM-18 Engineering Data Sheet EN 405KB Oct 14, 2014 Download
Name Language Size Date
R300 flyer en Español ES 634KB Sep 27, 2012 Download
Name Language Size Date
R300 Quick Start Guide EN 118KB Sep 21, 2015 Download
R300 User Guide EN 897KB May 3, 2016 Download
Name Language Size Date
Audio 101 - Microphone Basics EN 4.25MB Dec 13, 2012 Download
Audio 101 - Wireless Microphone Basics EN 3.52MB Dec 13, 2012 Download
Name Type Size Date
R300-L PNG PNG 572KB May 4, 2017 Download
R300BPFamily PNG 683KB May 4, 2017 Download
R300LAVMicfr JPG 276KB May 4, 2017 Download

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