ETS SM1-TRWUC Instructions

SM1-TRWUC Microphone Instructions
The SM1- is a high quality, 12V-24VDC powered, compact, tamper resistant, weather proof (IP55), surface mount, omni-
directional, pre-amplified microphone for use with DRVs, IP cameras, etc. Note- the audio output of the SM1-TRWUC is
"line level" (0db).
SM1-TRWUC Microphone Placement
The SM1-TRWUC 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-TRWUC should be placed as close as possible to the subject of interest. The SM1-TRWUC 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-TRWUC 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-FE Gain
The SM1-FE output level is set by selecting the desired volume range and adjusting the gain control.
The "Volume Range" switch should be set to the "LO" position when using the SM1-FE with IP cameras that utilize
"microphone inputs" also known as "Mic. Level" inputs. This sets the maximum gain of the SM1-FE's pre-amp to x14. The
switch should be placed in the "HI" position when using IP cameras with "Line level" inputs of DVRs and I/P cameras. This
sets the maximum gain of the SM1-FE's pre-amp to x196.
The SM1-FE is shipped with the gain set at midrange. If the sound at the "head end" is distorted, rotate the control
towards the – mark (counter-clockwise). If the volume at the "head end" is too low, rotate the control towards the + mark
(clockwise).
Setting the SM1-FE Hi-Cut/Lo-Cut Switches
The normal frequency response of the SM1-FE microphone is 500-13Khz. When both switched "On", The "HI Cut" and
"Lo Cut" filters set the SM1-FE's frequency response to 900-6Khz . Enabling one or both of the filters is useful when
background noise needs to be further reduced and intelligibility of speech emphasized. We recommend experimenting
with the jumper settings to achieve the best acoustic result for your application.