
Introduction
C18 Radio Module is an add-on module with integrated radio receiver for VAKA systems. The com-
munication between transmitter and receiver is encrypted with, "jumping keys", to prevent eaves-
dropping.
VAKA's radio system communicates at a frequency of 868 MHz and Axema's radio keys have
unique IDs that enable tracking in the system's event log. The RN18-4 radio key has four different
buttons, all of which can have different functions, such as remote door opening or remote control of
relays in the C17 module. The radio key RN18-1 has one button that corresponds to the A button
on RN18-4. It is possible to mount several C18 modules in the same system, but, then it is recom-
mended that different buttons on the radio key are programmed for each C18 module.
C18 is delivered with a small quartz wave antenna that must be positioned vertically for best cov-
erage. Optimal mounting of the antenna requires an intervention in the door controller enclosure. If
longer reading distances are required, for example for gate and gate control, there is an external
antenna (MMCX connector) with 3 m of cast cable (Article number, 2-5010). If only very short read-
ing distances are required, no antenna needs to be used.
Mounting
lWhen broadcasting through exterior wall or concrete wall, for example for garage ports
control, an external antenna is recommended.
lWhen broadcasting through inner walls, for example a plaster wall between front door and
office, the quartz antenna is recommended.
lWhen broadcasting in an office environment the quartz antenna is recommended.
Depending on the desired range, the C18's integrated antenna may be sufficient.
lMetal cabinets and the like, shield radio waves and can completely eliminate reception.
Place the antenna as far away from metal objects as possible.
2(4) Connection instructionsC18