Data Sheet

SM1-TRW Omni-directional
Pre-amplified Microphone
Electronic Technical Services Inc.
211 Conchas SE
Albuquerque, NM 87123
PH 505-888-3923 FAX [phone]
Website: www.etsnm.com
Description
High performance, weather resistant
Omni-directional, pre-amplified
microphone for fixed location security
applications where vandalism is of
concern. Electret element is mounted in
a special housing which is out of reach to
objects inserted into the sound holes. 25’
pickup pattern in all directions. Built in
limiter circuit automatically lowers the
output level during loud sound intervals.
Hi cut and low cut filters significantly
reduce background noise. Stainless steel
plate mounts flush or on a single gang
electrical box.
Connects directly to our switcher / mixer /
amplifiers or use one of our many
interface products to make fast and clean
connections to DVRs or remote
monitoring equipment.
Includes:
 SM1-TRW flush mount microphone.
 Sealing gasket
 Mounting screws.
 Warning label.
 Installation instructions.
Wiring requirements:
2 conductor shielded (with drain wire) 22
gauge stranded. Max cable length 1500’.
Caution
It is the responsibility of the installation
company and end user to install this audio
surveillance equipment in compliance with
state and federal privacy laws. If you are
unfamiliar with these laws, consult a qualified
attorney.
Warranty
1 year parts and labor. Made in USA
SM1-TRW Specifications
 Omni-directional 25’ pickup pattern.
 Low noise MOSFET pre-amplifier.
 500Hz-13Khz Frequency response.
 Jumper selectable hi-cut/low-cut filters limit
frequency response to 900-6khz significantly
reducing background noise.
 Jumper selectable volume range:
"Line level" (0db) or
"Microphone level" (-30db)
 Adjustable gain in both volume ranges.
 100 Ohm unbalanced output.
 Internal peak limiter circuit (.5 sec response)
 3 position Euro-style connector makes cable
termination fast and clean.
 Reverse polarity protected
 Power: 12 to 24VDC @ 10mA.
 On-board voltage regulator and RFI filtering.
 S/N ratio: more than 60DB
 Sensitivity –45DB
 Industrial temperature range –40 to 105C
 Internal .5" thick windscreen.
 Conformal coated circuit board.
 Stainless steel plate mounts flush or on a sin-
gle gang electrical box.
 Dimensions: L 4.5” W 2.7” H 1.1”
 Weight .07lbs
Sound Surveillance
tm