User's Manual

SD250NTG–USERGUIDE
April4,
2011

MidlandRadioCorporation

11
Installation
Antennas
It is important that any antennas are installed in a suitable location with an
adequate ground plane. Ideally, multiple antennas should be separated by a
minimum of a wavelength (at the lowest frequency), whilst still retaining a good
ground plane for each antenna. Therefore, for a 400MHz system, the ideal
separation should be a minimum of 0.75m.
Warning: If installing an antenna near people it is necessary to ensure the
minimum separation is maintained. This is particularly important where prolonged
exposure is likely.
Power sources
It is important that a “clean” source of power is used for the 12V supply to the
modem