Dräger PSS Merlin User Manual

Propagation
Dräger PSS
®
Merlin
®
41
Appendix E – Propagation
The signal power of a radio frequency transmission diminishes over distance. Signal power will also decrease in strength as the
radio wave passes through solid objects such as terrain, trees, walls, windows and the floors of buildings, storage tanks,
underground (tunnels), etc.
The Entry Control Board (ECB) and electronic monitoring systems have the ability to transmit and receive radio signals; in other
words they are able to talk to each other. Propagation, for the Dräger PSS
®
Merlin
®
Telemetry System, means the ability of the
two-way digital data and alert status communication radio transmissions to be positively maintained.
Extensive trials, in partnership with a number of major customers and covering a wide range of applications, have proven a high
degree of propagation reliability for the Dräger PSS
®
Merlin
®
Telemetry System.
E.1 Propagation Factors
The following chapters are intended to provide the user of the Dräger PSS
®
Merlin
®
Telemetry System with some guidelines on
how to maximise the effective use of the system.
E.1.1 Antennas
The ECB antenna is located inside the cavity of the upper side carrying handle of the ECB case. The antennas of the devices
fitted to the breathing apparatus are located as follows:
 Bodyguard
®
II – located on the top of the radio module, protected by a rubber shroud.
 Bodyguard
®
7000 (Merlin
®
Modem) – located on the bottom of the unit, protected by a rubber shroud.
 Connect ECU – located inside the Connect ECU UI module underneath the Dräger logo.
Entry Control Board Bodyguard
®
II
Bodyguard
®
7000 Connect ECU
1541
Antenna
Antenna
1951
Antenna
3018
Antenna
5169A

Dräger PSS Merlin Specifications

General

Brand	Dräger
Model	PSS Merlin
Category	Firefighting Equipment
Language	English