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Office Hours
Monday through Thursday, 8:00 am to 5:00 pm Pacific Time; closed Fridays

Broadcast Tools, Inc. will be closed in observance of the following holidays:
Closed December 25 through January 1, 2014. Limited technical support is available during the holiday break.

New Year’s Day, Thursday, January 1, 2015
Memorial Day, Monday, May 26, 2014
Labor Day, Monday, September 1, 2014
Thanksgiving Day, Thursday, November 27, 2014
Christmas Day, Thursday, December 25, 2014



Designed and Assembled in
Washington State, USA

Web site design by:
SM-III Plus


Product Overview The Broadcast Tools Silence Monitor III Plus improves on the features of the original Broadcast Tools SSM. The Silence Monitor III Plus is designed to monitor any stereo or two independent monaural sources, generate alarms and transparently switch to back-up source equipment when silence is detected. Features include: front panel, remote control and relay monitoring; Plug-in euroblock screw terminals; \"Plug & Play\" (NO POTS) installation; dipswitch selection of silence detection of -23, -25, -35 and -45db; precise time delay from 2 seconds to 85 minutes; precise restore timing delay from off to 42 minutes; defeatable sonalert aural alarm; relays for most remote functions. The SM III Plus may be set on a desktop, mounted on a wall or optional RA-1 rack shelf for mounting up to three units in 1-RU.
Features/Benefits

  • Transparent stereo or dual monaural program switcher with front panel
    switcher transfer switch and indicator LED.
  • Dipswitch selection of silence detection of -23, -25, -35 and -45db
  • Precise time delay from 2 seconds to 85 minutes
  • Precise restore timing delay from off to 42 minutes
  • May be configured for stereo or dual independent monaural operation
  • Active balanced inputs
  • Front panel switcher transfer switch
  • Front panel \"Mute\" switch with built-in sonalert and remote defeat input
  • Front panel \"Manual/Automatic\" switch with front panel LED, remote input and relay
  • Front Panel Alarm \"Reset\" switch, Tripped LED and relay
  • External (\"Ext\") alarm input with front panel indicator and relay
  • Front Panel Power LED
  • Two independent audio alarm relays
  • Two pulse open collector alarm outputs
  • Auxiliary SPDT relay with user configuration of pulse and
  • Plug-in euroblock screw terminals
  • The SM III Plus may be set on a desktop, mounted on a wall or optional RA-1 rack shelf for mounting up to three units in 1-RU

131 State Street • Sedro-Woolley, WA 98284
Ph: 360.854.9559 • support@broadcasttools.com • Fax: 866.783.1742
Monday through Thursday 8:00 AM to 5:00 PM Pacific Time

Broadcast Tools® is a registered trademark of Broadcast Tools, Inc.
tiny TOOLS™ is a trademark of Broadcast Tools, Inc.
All Sentinel® labeled products is a registered trademark of Broadcast Tools, Inc.
Copyright ® 1989 - 2014 by Broadcast Tools, Inc. All rights reserved.
Pricing and availability are subject to change without notice.