Rf Path And Communications Range; Antennas; Parallel Decode; (Exclusive To The Full-Featured Hipr-900 Version) - Cal Amp Dataradio HiPR-900 User Manual

Wireless radio modem

Table of Contents

2.2.4 RF Path and communications range

The range of the HiPR-900 is dependent on terrain, RF (radio frequency) path obstacles, and antenna sys-

tem design. To assure reliable communications, a competent professional should study the RF path to de-

termine what antennas are required and whether or not a repeater is needed.

NOTE: Any full-featured HiPR-900 unit can be a repeater.

The antennas listed in Table 1 (page 3), were tested and typed for maximum gain. These antennas are

FCC-approved for use with the HiPR-900. Similar antenna types from other manufacturers are equally

acceptable.

2.3

Dataradio's patented

Parallel Decode technology combines Spatial Diversity and Smart Combining to

provide increased sensitivity plus improved immunity to multi-path fading. Even in the absence of mo-

tion, the changing wavelengths inherent in frequency-hopping systems make it possible for stationary

sites to experience frequency-selective interference. Parallel Decode technology receives and continuous-

ly combines signals from two antennas a short distance apart, ensuring a more reliable link.

Full 1W transmit power can be used with up to 6 dBi antenna gain on the TX/RX port. The dual antenna

connections also permit the use of a higher-gain antenna for the receiver (RX only).

Dual antenna ports also permit receiving from a far distant site with a high- gain antenna while using an

omni directional to serve local stations. The Parallel Decode receiver algorithm automatically and conti-

nually decodes signals from both antennas.

In special applications such as rotating machinery, dual antenna ports allow the use of cross-polarized

antennas, automatically selecting the best received signal regardless of the orientation of the machine.

(United States Patent No: 6,853,694 B1)

001-5099-000

37cm

14.58in.

Figure 3 - Antenna Spacing

≥5/8λ

900MHz: 8"/21cm

HiPR-900 User Manual

Table of Contents