Nova Engineering NovaRoam™ 900 Spread Spectrum Transceiver User’s Manual Nova Engineering 5 Circle Freeway Drive Cincinnati, OH 45246 513 860 3456 FAX 513 860 3535 www.nova-eng.com © 1999 Nova Engineering, Inc. All Rights Reserved.
1.0 Introduction Nova Engineering’s NovaRoam™ 900 is a complete direct sequence spread spectrum (DSSS) transceiver tailored for industrial applications that operates in the 915MHz industrial, scientific, and medical (ISM) frequency band. This product can be used for multiple access networking, point to point, or broadcast operation. The DSSS waveform results in enhanced immunity to interference, yielding increased link reliability, especially in congested areas.
Nova Engineering’s custom design expertise identifies the optimum RF channels, antennas, antenna heights, operating mode, and network topology. NOTE This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
Table 2 Mode 1 2 3 4 5 6 7 NovaRoam™ 900 Channels Channel Frequency (MHz) Minimum Maximum 906 924 906 924 906 924 909 921 909 921 909 921 909 921 The signal bandwidth also limits the channels that may be selected since the FCC Rules prohibit the spectrum from extending beyond the 902 to 928MHz boundaries. Thus the narrower bandwidth signals may be assigned channels that are closer to these limits, as shown in Table 2.
transceivers that are dispersed throughout a region. Yagi antennas are most effective at fixed remote sites in a master/slave network that simply need to exchange packets directly with a single node in the network. The coaxial cable assemblies that accompany each of the NovaRoam™ 900 antennas are designed to be mated to the antenna and the NovaRoam™ 900 antenna port. There is only one way to make this connection since the antenna uses a Type N connector while the NovaRoam™ 900 employs an RP-TNC.
NovaRoam™ 900 Transceiver Specification Electrical Parameters Specification Waveform Direct Sequence Spread Spectrum Frequency Range 902-928MHz ISM Band Modulation Type Differential BPSK or QPSK Spread Bandwidth 9.0MHz or 2.1MHz (User Programmable) Channel Spacing 500kHz Sensitivity -101dBm at 159kbps channel burst rate for 10-5 BER Adjacent Channel Rejection 45dB at 4.0MHz offset IF Rejection 70dB Image Rejection 70dB LO Leakage -80dBm Channel Burst Data Rate 7 Programmable Data Rates from 21kbps to 1.