Propagation
Dräger PSS
®
Merlin
®
43
E.2 Enhancing Transmission
E.2.1 Repeaters
As outlined in the preceding sections, the critical factor influencing the maintenance of positive radio contact is the location of the
antennas. There are some instances where an RF propagation problem could result in some, or all, of the electronic monitoring
units losing radio contact and becoming unable to communicate directly with the ECB.
Repeater units strategically sited at an incident can provide a
means of minimising the risk of transmission loss by enhancing
the two-way digital data communication link. The Repeater unit
is able to receive data transmissions and then to re-transmit to
any electronic monitoring unit or ECB within range.
The Dräger PSS
®
Merlin
®
Telemetry Repeater System
consists of up to two Repeater units (identified as Repeater
no. 1 and Repeater no. 2). Each unit is battery-powered and
incorporates an integral digital radio transmitter and receiver,
with associated antenna (contact Dräger for details).
Positioning of the Repeaters is as follows:
Repeater no. 1 must be in range of the ECB.
Repeater no. 2 must be in range of Repeater no. 1
(refer to the chain configuration) or in range of the ECB
(refer to the star configuration).
A successful radio link with the ECB is indicated on the control
panel of the Repeater by a flashing green LED.
2989
Team No. 2Team No. 1
Star Configuration
To Next Page
Loading...