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EtherWave - WMR
7.0 Installation
Frequency
The 900MHz frequency range is not effected by rain to any signifi-
cant degree, and is also able to penetrate through foliage and
‘around obstacles’ to a certain degree. This being the case, some
may choose to scrimp on the physical deployment, particularly when
it comes to antenna (tower) heights. Path calculations provide re-
sults which specify ‘required’ antenna heights. For cost savings and
in taking advantage of the characteristics of the 900MHz frequency
range, sometimes the height requirements are not adhered to: this
may result in unreliable communications.
Power Requirements
The EtherWave-WMR accepts a range of DC input voltages (keep in
mind that supply current requirements must also be met). In some
deployments, power consumption is critical. Power consumption for
the EtherWave-WMR may be minimized by reducing the transmit
power, given the receive sensitivity of the distant modem.
Interference
The frequency hopping spread spectrum (FHSS) operation of the
EtherWave-WMR modem most often allows it to work well in an envi-
ronment within which there may be sources of inband interference.
Frequency Restriction is a built-in feature which may be utilized to
avoid specific frequencies or ranges of frequencies; the built-in Radio
Channels Noise Level tool may be used to identify areas of potential
interference. Cavity filters are also available if required: contact
IoSelect Inc. for further information.
