An NDB transmitter is usually in an equipment room and the person who needs to know its
state is not. The ECMP3 is the answer to that at its simplest: a panel, somewhere useful, whose
LEDs show whether the beacon is healthy and whose sounder says so if it is not.
Nautel are candid about the positioning - it provides economical, basic control and
monitoring of a Vector NDB system for situations where more extensive control and monitoring is
not required. That honesty is useful. If a site needs graphs, logs and remote configuration,
the VR-Link with its browser interface is the right product. If what is needed is for the
radio room or the control room to know the beacon is on air, this is cheaper, simpler and has
nothing to go wrong.
The audible alarm is the part worth configuring properly. It is user configurable to
activate from any of the status alarm inputs, either on the input being asserted or on it
changing state, and an acknowledge button silences the recurrence. That distinction between
asserted and changed state is more useful than it first appears: some conditions matter while
they persist, others matter at the moment they happen. Getting that right is what stops a
panel being either ignored or silenced permanently - the two ways alarm panels fail in
practice.
Alongside it there is a timer ON/OFF switch that remotely triggers the programmable
operation timer in the Vector transmitter, a test feature, brightness and volume controls, and
spare user-configurable control and monitoring channels for whatever else the site wants
brought to the panel. Brightness control matters on a bridge or in a darkened control room,
where a bright panel is a nuisance rather than an aid.
Connection is either directly to the Vector transmitter through the optional Site Interface
board, or via the optional VR-Link remote control and monitoring unit over RS-485 serial
communication. Up to three external ECMP3s and one internal panel can be connected to a
VR-Link, so the beacon's state can appear in the radio room, the control room and the
maintenance workshop at once, which is usually what a site actually wants.