OG_MU4-RS2IF_v10e Circuit Design, Inc.
13
OPERATION GUIDE
In systems where a non-directional antenna is required, it is important that the antennas of the transmitting station
and target stations stand vertically in order to exploit communication performance to the maximum. If the planes of
polarisation of the radio waves do not match, receive sensitivity may drop significantly.
Note that if, for reasons peculiar to the equipment, the antenna must be inside the case, communication
performance will be very significantly degraded when handled in the following ways, since these methods
contravene antenna theory. It is the responsibility of the user to test performance thoroughly when designing
equipment.
1. Putting the antenna inside a metal case
2. Wrapping the antenna around the circuit board
3. Locating the antenna beside the ground pattern of the circuit board
4. Fitting the antenna inside by bending it
5. Cutting the antenna to make it shorter
The antenna provided with the MU-4
is a 1/4λ whip antenna. Whip antennas are antennas that substitute the ground
as one end of a dipole antenna. For this reason the ground has a very important meaning. Although the main unit of
the MU-4 has the function of a ground, in order to exploit its performance fully, connect it to the largest possible
ground pattern when mounting the MU-4 on your circuit board.
In addition, in the case of two way communication between fixed stations, inclining the whip antenna of the MU-4
forwards may increase its communication range. Carry out tests in the specific environment of use.
The MU4-RS2 is a product that uses an RS232C interface to interface with external equipment. If the MU4-RS2 is
used embedded in a final product, the regulatory compliance assessment in accordance with the RE Directive
depends on the final product. Regulatory compliance assessment should be carried out on the responsibility of the
manufacturer of the final product.
For details of the CE mark, refer to the MU-4 Operation Guide.
Point:
The MU-4 radio modem has passed the regulatory compliance assessment in accordance with RE Directive a
stand-alone product, and has received the CE mark.
1.
Devise ways of isolating the unit as far as possible from noise from other embedded equipment and from other
sources of noise.
2.
Arrange the system equipment so that it will not be
covered by the operator’s hand or the like.
3.
The MU-4 does not have a waterproof structure. If the antenna is located outside the main unit, use a structure
that prevents water droplets from entering the case.
4.2 The Antenna
4.3 Regulatory Compliance
4.4 Cautions
