Energy and Lifesaving Devices Inc. MA-T1 Manual Do Utilizador

MertsAlert Transmitter Manual 

 

Page 4 of 6 

 

MertsAlert System Block Diagram 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 

 
 
 

 
When the alarm system in the fire truck or ambulance is turned on, power is also applied 
to the MertsAlert transmitter.  There is no additional procedure needed for the vehicle 
operator.  A unique, low-power radio signal is transmitted periodically on an unlicensed 
band of radio frequencies.  The signal contains information to identify the source of the 
alert, and is encoded to minimize interference from unrelated transmitters using the same 
frequency band.   
 
The MertsAlert receiver detects and decodes the transmitting signal.  If the source is 
identified as a MertsAlert transmitter and the signal strength is adequate, the alert signal 
will warn the driver of a nearby emergency vehicle.  The range is typically 2 or 3 city 
blocks in an urban area or approximately 1/3 mile in a rural setting. 

Installed in 

Emergency 

Vehicle 

Power 

Switched

from existing

Siren or Lights

Optional

Trigger from

Siren or Lights

External 

Antenna 

Installed in 

Personal 

Vehicle 

Power 

Switch 

Internal 

Antenna 

Internal 

Battery 

Alert indicators, audible & visible 

RP-SMA 
Connector 

MertAlert Transmitter Unit 

MertAlert Receiver Unit