Spacing And Constraints - Cal Amp Dataradio HiPR-900 User Manual

FCC/IC Rule: The output power is not to exceed 1.0 watt (30 dBm) and the EIRP not to exceed 6 dBi
gain (+36dBm). A sample calculation is provided below.
Referring to Figure 2:
Sample Calculation:
(Initial output level) dBm - (excess antenna gain) dB + (cable loss) dB = (new power setting) dBm
Therefore, the sample calculation becomes: 30dBm – 2.5 dB + 1.5dB = 29 dBm
The HiPR-900 output must be reduced by 1 dB to 29 dBm.

2.2.3 Spacing and Constraints

(Exclusive to the full-featured HiPR-900 version)
Referring to Figure 3 HiPR-900 radio modems commonly use two separate antennas
•
"T" - Main transceiver – Constraints are the limit of 14.58 in/37 cm (see 2.2.1 above) and omni-
directional factors
• "R" - Auxiliary receiver – Constraints are the receiver spacing of at least 5/8 λ (wavelength) from
transceiver antenna and omni-directional requirements (8in. / 21cm). There is no gain restriction.
For installation of ground-plane dependent antennas, the center of the surface used for mounting is pre-
ferable for best omni-directional pattern. For ground-plane independent antennas, installation may be
close to the edges of the mounting surface.
001-5099-000
Yagi Antenna: 8.5 dBi, which exceeds 6 dBi gain by 2.5 dB
Cable Loss: 1.5 dB
HiPR-900 output initially set to 30 dBm (1 watt).
"R" = RX
"T" = TX/RX
29 dBm
Figure 2 - Sample equation
27.5 dBM
6
8.5 dBI Gain Yagi
ERIP = 36 dBM
HiPR-900 User Manual