RRM02 - Product Manual
Issue: 02 complete, approved
Page 5 of 68
1 Description
The RRM02 Remote Radio Microphone Receiver provides a method of implementation of RPA (Roving
Public Address) functions to defined loudspeaker zones. This unit is a convenient and compact method of
providing a radio microphone receiver when a SAP02 Station Announcement Point is not required. This
would be particularly desirable for zones where there is no additional requirement for a fixed fist microphone
such as the SAP02.
The RRM02 is designed to work with the whole range of ASL Voice Alarm and Public Address systems,
while the provision of the closing contact select output from the RRM02 also enables it to be connected to
PA (Public Address) systems other than those provided by ASL.
Where localised radio microphone coverage is required the RRM02 can be installed without any antenna
cabling, using antenna mounting points on its upper face. If a larger area is to be covered then remote
antennae can be used, and antenna combiners can be used to add further antennae, or multiple RRM02
units can be used in one zone. This functionality may be particularly useful in installations where several
radio microphone antennae are required due to the topology of the zone, e.g. for a long and winding
passenger walkway.
The RRM02 is physically implemented as an IP65 sealed enclosure, and is designed to be mounted against
a vertical wall or other surface in the PA zone. The lower face of the unit provides ‘Power’, ‘Active’, and
‘Busy’ status indicators.
Internally the RRM02 comprises a Radio Microphone Receiver and a microphone PCB (Printed Circuit
Board). A processor on the microphone PCB interfaces all LED indicators and the PTT (Press To Talk)
signal to the ASL PA system by means of a serial interface, while microphone audio is provided as a
balanced 0 dBu (nominal) analogue signal. The microphone’s processor is also responsible for generating
an outgoing low-frequency surveillance tone which is used to monitor the audio connection to the Router.
The processor also interfaces the PTT (Press to Talk) signal to non-ASL PA systems by means of a relay
closing contact.
The Radio Microphone Receiver is a high quality, fully synthesised diversity receiver, capable of working on
ten frequencies that are selectable via a rotary switch. Additional circuitry for pilot tone detection prevents
announcements from unauthorised transmitters. The pilot tone frequency is unique to this receiver. Thus
only announcements from transmitters able to provide the same pilot tone, such as the ASL RPA01
Transmitter, are broadcast to the system, while announcements from unauthorised transmitters are blocked.
This security feature can however be disabled for compatibility with transmitters that do not provide the pilot
tone.
The Radio Microphone Receiver provides phantom power for mast-head antenna amplifiers, which is ideal
for demanding RF environments. The phantom power is current limited so that a short circuit on one antenna
does not disable the other.
The RRM02 is designed to mount two ASL ANT03 Whip Antenna on the upper face, or remotely connected
to the RRM02. The ASL ANT04 Low Profile Antenna can also be used as a remote antenna, if required, as
can other suitable antennae.
Note that no antennae are supplied with the RRM02, and the appropriate type needs to be ordered
separately.
Field connections are provided by DIN rail terminals mounted on the inside rear panel of the back box.
