User Manual

7
Gain / User Proximity to Antenna
It is important to keep the radio’s antenna a safe distance from the user. In order to
meet the requirements of FCC part 2.1091 for radio frequency radiation exposure, this
module must be used in such a way as to guarantee at least 20 cm between the antenna
and the body. The FCC requires a minimum distance from the user of "Distance for
1mW cm
2
squared powe r density" or 20cm, which ever is the greater distance.
If a specific application requires a proximity of less than 20cm, the application must be
approved through the FCC for compliance to part 2.1093.
At the time of this printing, the antennas listed be low were the only antennas approved
for use with the OS2400 Radio Modem. Use of other antennas must be approved
through Locus, Inc.
Antenna
gain
(dBi)
Locus Inc. approved
antennas
(Manufacturer: mfg
number)
Distance for
1mW/cm
2
power density
Distance
(in)
2
NCC: N24ARSMA1
NCC: N2400SM8
NCC: NOV2400SMA 4.0 (1.6in) 20cm (7.9in)
5
NCC: N24HGASM1B
NCC:
NOV24HEARSMA2B
6 (2.2in) 20cm (7.9in)
6 MaxRad: MFB-24006 6.5 (2.5in) 20cm (7.9in)
8
MaxRad: MFB-24008
MaxRad:
MP24008FSMA
8.0 (3.1in) 20cm (7.9in)
9 Mobile Mark: 0D9-2400 9.0 (3.5in) 20cm (7.9in)
11 MaxRad:
MP24011FSMA
12.0 (4.4in) 20cm (7.9in)
13 MaxRad:
MP24013FSMA
15.0 (6.0in) 20cm (7.9in)
The following high gain antennas can only be used for point -to-point network applications.
15 Astron: P-2415 18.0 (7.0in) 20cm (7.9in)
24 Pacific Wireless:
PMANT25
50.0 cm
(19.7in)
50cm (19.7in)