ETS SM1-TRCF Instructions

SM1-TRCF Microphone Instructions
The SM1- is a high quality, 12VDC-24VDC powered, compact, tamper resistant, surface mount, omni-directional, pre-
amplified microphone for use with DRVs, I/P cameras, etc. Note- the audio output of the SM1-TRCF is "line level" (0db).

SM1-TRCF Microphone Placement

The SM1-TRCF is designed for indoor applications and surface mounted on any flat surface using the supplied tamper
resistant screws. Do not mount the microphone near air conditioning vents, light fixtures or electrical equipment. The
SM1-TRWCF should be placed as close as possible to the subject of interest. The SM1-TRWCF is useable in the range of
3-25 feet but is dependent on the level of background noise in the area. Experimentation in the environment will determine
what distances work best.

Cable Run

Run a 22 gauge, stranded, two conductor shielded cable between the SM1-TRCF microphone and the monitoring device.
Keep the cable run distance under 1,000 feet and away from AC power sources, light fixtures and electrical equipment.
Connect power to the + terminal, the audio signal to the "audio" terminal and ground to the – terminal. The Ground of the
power and audio signal must share a common ground for proper operation. See Figure 1 for connection diagram.

Sound Chamber Wind Screen

Over time the wind screen may become saturated with moisture or dirt and the sound quality and volume will be
noticeably reduced. If this happens, remove and soak the screen in soapy warm water. Then, rinse and wring out the
excess water from the screen and reinstall it.

Adjusting the SM1-TRCF Gain

The SM1-TRCF has an adjustable output level. The SM1-TRCF is shipped with the gain set at midrange. If the sound at
the "head end" is distorted, rotate the control counter-clockwise. If the volume at the "head end" is too low, rotate the
control clockwise.