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International - 316.788.2000

Master Transmitters

UHF Wireless Network VoIP

The master transmitter is the heart of your EMN system. It transmits emergency messages, live audio and time to all of your secondary components.

The master clock obtains time from the computer network or NTP Time Server located on your campus computer network. Included is an FCC Approved transceiver, alarm schedule and control software, UPS battery backup, RF power meter, and rack mount cabinet.


No master transmitter is required for VoIP

UHF Wireless Masters Continued

Available in 5, 25, 70, 100 & 200 Watt configurations.

The master transmitter also controls:

  • Wireless indoor speakers
  • Wireless indoor message displays
  • Wireless outdoor speakers
  • Wireless strobes
  • Wireless outdoor broadcast systems (OBS)
  • Wireless repeaters
  • Wired indoor speakers
  • Wireless fire control panel receivers
  • Wireless PA receivers
  • Wireless Analog & Digital Clocks                                            

Available in 5, 25 and 100 watt power configurations for wide area coverage. 100-260 volts AC, 50 -60 cycles.

BRG highly recommends that you purchase a backup transmitter to place in a second location on your campus in case of the main transmitter is disabled in a disaster.

  • Each master transmitter comes standard with NTP Time synchronization. GPS is available as an option
  • Synchronizes time across your campus
  • Transmits time, audio & text messages to all secondary devices
  • Automatically adjust time for DST
  • UPS battery backup
  • long duration battery backup

Site surveys are performed by our sales staff prior to purchase to:

  • Determine the Wattage of transmitter needed to cover your facility or campus
  • Identify problem signal areas on campus
  • Monitor radio frequencies in the area for traffic and conflicting signals
  • Suggest secondary devices that will fit your needs and budget
  • Recommend locations for placing the primary and secondary master transmitters

All master transmitters are installed and tested by factory authorized installers to make sure your system is operating at peak performance.

Each system is backed by a 12 month warranty. Extended warranties are available, contact BRG for details.




Each BRG System includes the following devices:

  • Mast Antenna
  • 50' of LMR 400 low-loss antenna cable
  • Non-penetrating antenna roof mount
  • Tekk XT-40 two way monitoring radio
  • Wireless Signal Monitor
  • Watt meter to measuring effective radiated power (ERP)
  • Telephone control interface
  • BRG Wireless EMN Software
  • Ethernet network interface
  • UPS Battery Backup

Operating Frequencies

BRG’s Master Transmitters operate on the UHF Business Band Frequencies of 462-464 MHz and Military Band Frequencies of 411-415 MHz UHF.  UHF was selected because of it is the optimum band for indoor radio transmission.  The UHF signal is ideally suited for this application because of it’s short, two foot wave length, travels easily down elevator shafts, along hallways, through windows and through metal stud walls to give you maximum coverage.  This allows the signal to reach most points within a building, facility or campus.  The wave length of a lower frequency signal is too long to travel easily throughout a building.  This is why WWAV/Atomic Clocks don’t work well in commercial buildings.  When using a higher frequency than 464 MHz, the interior walls of your building(s) become opaque to the radio signal, and again signal propagation is reduced.

BRG Precision Products provides a variety of frequency choices for commercial and military applications.  We offer fourteen commercial business band and five military band frequencies to avoid any trouble with competing traffic on any one frequency.



US Commercial Frequencies:
464.650 MHz
464.600 MHz
462.400 MHz
462.425 MHz
462.450 MHz
460.400 MHz
462.200 MHz
462.225 MHz
462.250 MHz
462.275 MHz
462.300 MHz
462.325 MHz
462.350 MHz
462.375 MHz

U.S. Government frequencies:
411.7125 MHz - Preferred First
412.4125 MHz
413.3125 MHz - Preferred Second
414.2875 MHz
415.0625 MHz

Canadian Frequencies Industry Canada will assign a frequency prior to installation of the equipment.

EMN Control PC

The EMN Control Computer is the command station that controls the master transmitter(s) in your system. The BRG EMN Software comes installed on a Windows 10 PC.  It provides the ability to activate a pre-recorded message, a Text-to-Speech (TTS) message, a live audio message or an message that is provided by an emergency texting RSS Feed. The control PC also allows you to dial into an analog phone line and activate a pre-recorded message or make a live audio message from any touch-tone or cellular telephone.

At least one EMN control PC is required with each system. To learn more, click here.


Part Number: EMNTTSPC

FCC License

Because the BRG EMN System operates on a shared Commercial UHF FM frequency, the FCC requires that our customers purchase a License for each transmitter in each installed location. This includes any signal repeaters that might be required for total campus coverage.

BRG works closely with you to get the necessary information required. Then we submit the paperwork for you.

EMN System Accessories

(Each EMN Transmitter comes with the following accessories.)

Radio Signal Monitoring

The radio signal monitor is a two way radio that is used to monitor the master transmitters radio transmissions. It allows you to listen to the signal strength and check the signal quality in poor signal areas like floors below grade.

The radio is programmed at the factory to work on the UHF radio frequencies that you are using at your campus(s).

The two way radio is only used to monitor the Transmitter signal, it is not used for broadcasting audio over our wireless speakers or OBS Systems.

One of these is included with the purchase of each EMN System. Additional WTMs can be purchased as an option to your system

Part Number: SIGSTR .


Wireless Master Transmitter Monitor

The WTM is designed to listen for the master transmitter. It automatically logs all transmissions the master transmitter makes during a 24 hour period.

The WTM is installed at the Master Control PC and will provide you with a audio warning and pop-up window if the master transmitter fails to transmit within a 60 second period. This provides you time you to switch from your primary to secondary master transmitter so you are ready to transmit if an emergency arises.

One WTM is included with the purchase of each EMN Master Transmitter. Additional WTMs can be purchased as an option to your system.

Part Number: WTM




Optional Items

Signal Repeaters

When there are areas of your campus where UHF signals can’t reach, BRG has the answer. With the addition of a 5 or 25 Watt repeater BRG will capture the signal and rebroadcast it in the low signal areas, providing complete coverage even in hard to reach basement areas.This repeaters are housed in protective housings that are place in the low signal area. A receiver is then placed in a location that has an excellent signal. The receiver and the repeater are then connected together with CAT5 wiring.When an emergency announcement is activated, the receiver immediately sends the signal to the repeater. The repeater transmits the emergency announcement through it’s 5 or 25 watt transmitter to all secondary devices that are located in the low signal area. Repeaters require an additional FCC License.

5 Watt Indoor Repeater

5 Watt Outdoor Repeater


  • 5 Watt repeater
  • 100 ft of CAT5 cable
  • Wireless receiver
  • UPS battery backup
  • 33” whip transmitting antenna


  • 5 Watt repeater
  • 100 ft of CAT5 cable
  • Outdoor wireless receiver
  • Directional antenna
  • UPS battery backup
  • 33” whip transmitting antenna

25 Watt Indoor Repeater

25 Watt Outdoor Repeater


  • 25 Watt repeater
  • Wattmeter
  • 100 ft of CAT5 cable
  • Wireless receiver
  • UPS battery backup
  • 33” whip transmitting antenna


  • 25 Watt repeater
  • Wattmeter
  • 100 ft of CAT5 cable
  • Outdoor wireless receiver
  • Directional antenna
  • UPS battery backup
  • 33” whip transmitting antenna

GSA Antenna Option

Indoor Installation

Outdoor Installation

High Sensitivity GPS Receiver

GPS receivers receive time packets from orbiting satellites to provide accurate, legal time for your campus.

Features Include:

  • Full navigation accuracy provided by Standard Positioning Service (SPS)
  • Supports high sensitivity for very weak signal acquisition and tracking
  • Integrated powerful CPU, base band and RF front-end hardware in a SOC (System On Chip) design reduces the space and power consumption is state of the art
  • Advanced IC technology reduces overall receiver cost
  • The receiver can receive up to 12 satellites simultaneously
  • Fast TTFF for cold start, warm start and hot start
  • High performance firmware allows excellent positioning speed
  • Includes battery backup to maintain internal clock for fast acquisition
  • RS422 long distance serial communications protocol. Communications cable may be up to 4,000 feet long. BRG provides 100 ft. of cable with the antenna

Information Central (Click on the information below to download informational PDF's)

Download the Wireless EMN Sales Sheet

Download Spec Sheet for :

25 Watt Master
100 Watt Master

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Copyright 2014 © BRG Precision Products, All Rights Reserved                                                                  600 River Street Derby, Kansas 67037  Phone 316.788.2000  Fax 316.788.7080
  Created by Jacques Designs, LLC