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interference on the same channel, or the radio path being inadequate. If the radio path is a
problem (i.e. path too long, or obstructions in the way), then higher performance antennas or a
higher mounting point for the antenna may rectify the problem. Alternately, use an intermediate
XYR 400E Module as a repeater.
The foldout sheet XYR 400E Installation Guide provides an installation drawing appropriate to
most applications. Further information is detailed below.
Each XYR 400E module should be effectively earthed via the "GND" terminal on the XYR 400E
module - this is to ensure that the surge protection circuits inside the XYR 400E module are
effective.
2.2
The XYR 400E module will operate reliably over large distances. The distance which may be
reliably achieved will vary with each application - depending on the type and location of
antennas, the degree of radio interference, and obstructions (such as buildings or trees) to the
radio path.
The maximum range achievable depends on the regulated RF power permitted in your country,
and whether you use separate transmit and receive antennas. With a single antenna, 5 km (3
miles) can be achieved in USA, Canada and Australia (4W ERP) and 1km in Europe (100mW
ERP). With separate transmit and receive antennas, more than 10km (6 miles) can be achieved
in USA, Canada and Australia and more than 5 km in Europe.
To achieve the maximum transmission distance, the antennas should be raised above
intermediate obstructions so the radio path is true "line of sight". The modules will operate
reliably with some obstruction of the radio path, although the reliable distance will be reduced.
Obstructions which are close to either antenna will have more of a blocking affect than
obstructions in the middle of the radio path. The XYR 400E modules provide a diagnostic feature
which displays the radio signal strength of transmissions (refer Diagnostics section).
Line-of-sight paths are only necessary to obtain the maximum range. Obstructions will reduce
the range, however may not prevent a reliable path. A larger amount of obstruction can be
tolerated for shorter distances. For short distances, it is possible to mount the antennas inside
buildings. An obstructed path requires testing to determine if the path will be reliable - refer the
section 6 of this manual.
Where it is not possible to achieve reliable communications between two XYR 400E modules,
then a third XYR 400E module may be used to receive the message and re-transmit it. This
module is referred to as a repeater. This module may also have a host device connected to it.
The XYR 400E unit has two antenna connections at the top of the module, allowing two
antennas to be fitted to the unit. The left connector (looking at the front) labeled "RX" is
connected only to the internal wireless receiver. The right connector labeled TX/RX is connected
to both the transmitter and receiver.
Note: when only one antenna is used, it must be connected to the right TX/RX connector.
Version 1
5/1/08
XYR400E Ethernet Modem
Antenna Installation
12
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