User's Manual Part 1
38 APCD-LM043-8.0 (DRAFT C)
3: Detailed Description
3.5.8 Transmit Power
The maximum transmit power (HIGH power setting) of the CCU and EUM is +26 dBm,
measured at the unit’s RF connector. It does not include gains and losses from antennas,
transmission lines, and lightning arrestors, all of which affect the ERP (Effective Radiated
Power) from the CAP or customer’s premise. Refer to Appendix F on page 229 for a
discussion of related FCC and Industry Canada guidelines.
The CCU and EUM transmit power can also be set to +15 dBm (LOW power setting), or to any
level in the range +15 dBm to +26 dBm, in 1 dB steps, to address special or regional
applications of the LMS4000, or for bench testing.
3.5.9 Receive Sensitivity
The receive sensitivity (received signal required to attain a raw data BER of 10
-5
or better
using 1000-byte packets) of the CCU and EUM is <
-86 dBm, measured at the unit’s RF
connector.
3.5.10 Antenna Connector
The RF connector used on the CCU and EUM is a WaveRider-proprietary connector. As noted
above, the use of a proprietary antenna connector is mandated by FCC requirements for a
unique RF connector on ISM products.
3.5.11 Antenna Control (EUM)
A DC voltage (5 VDC or 7.5 VDC) is applied to the EUM RF connector for powering and
controlling the WaveRider diversity antenna. One beam pattern is selected if the voltage is 5
VDC. A second beam pattern is selected if the voltage is 7.5 VDC.
CAUTION: The EUM sends DC power and control voltages
through the RF connector to the switched-beam diversity antenna.
You must use WaveRider-approved indoor or outdoor antennas;
otherwise, you could inadvertently short out the DC voltage and
damage the EUM. Contact WaveRider Technical Support for a list
of approved antennas.
3.5.12 Propagation Path
CCU and EUM radios and antennas provide the basis for excellent radio propagation in both
line of sight (LOS) and non line of sight (NLOS) EUM installations. Radio propagation in the
902 – 928 MHz ISM band is superior to propagation in higher ISM bands for several reasons:
• Lower free space loss
• Lower cable loss
• Lower vegetation loss
• Better wall and glass penetration