SM1-TRWCF Microphone Instructions
The SM1- is a high quality, 12VDC-24VDC powered, compact, tamper resistant, weather proof (IP55), surface mount,
omni-directional, pre-amplified microphone for use with DRVs, I/P cameras, etc. Note- the audio output of the SM1-
TRWCF is “line level” (0db).
SM1-TRWCF Microphone Placement
The SM1-TRWCF is designed for outdoor applications and can be 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. We
recommend pointing the microphone towards the ground so that water does not accumulate in the sound hole. 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-TRWCF 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.
Adjusting the SM1-TRWCF Gain
The SM1-TRWCF has an adjustable output level. The SM1-TRWCF 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.
