Spec Sheet
Description
High performance, covert telephone jack
style, Omni-directional, pre-amplified
microphone for fixed location security
applications. 25’ pickup pattern in all
directions. Built in limiter circuit
automatically lowers the output level
during loud sound intervals.
Selectable Hi cut and low cut filters
significantly reduce background noise.
ABS enclosure mounts on any surface.
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-RJ Surface mount microphone.
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.
SM1-RJ Specifications
Omni-directional 25’ pickup pattern.
One functioning RJ jack
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.
Dimensions: L 4.5” W 2.7” H 1.8”
Weight .09lbs
SM1-RJ Omni-directional, Telephone Jack
style, Pre-amplified Microphone
Electronic Technical Services Inc.
211 Conchas SE
Albuquerque, NM 87123
PH 505-888-3923 FAX 505-888-3926
Sound Surveillance
tm