2-4
Part No. 001-2100-XXX
2.3 RF Exposure Compliance Requirement
2.3.1 JSLM2 VHF Analog Telemetry Module
FCC Rule:
1.1307, 1.1310, 2.1091 (b) (d), 2.1093
IC Rule:
RSS-119 Section 9, RSS-102 Section 2.2
Description of Compliance:
The JSLM2 will be professionally installed in the SCADA (Supervisory Control And Data Acquisition) market
and will be mounted with a fixed RTU (Remote Terminal Unit). A typical installation would use a maximum gain
antenna of 10 dBi mounted on a tower. A minimum separation distance of more than 141 cm must be maintained
between the radiating structure and any person to classify as a mobile under FCC MPE regulations.
Note: It is the
responsibility of the user to guarantee compliance with the FCC MPE regulations when operating this
device in a way other than described above.
The calculation for the more stringent specification, a General Population/Uncontrolled Mobile device according
to section 2.1091(b) and section 1.1310 Note 2 is shown below:
Limits for General Population/Uncontrolled Exposure:
Frequency
Range (MHz)
Electric Field
Strength (V/m)
Magnetic Field
Strength (A/m)
Power Density (mW/cm
2
) Averaging
Time (mins)
0.3-1.34 614
1.63
*(100)
30
1.34-30 824/f
2.19/f
*(180/f2)
30
30-300 27.5
0.073
0.2
30
300-1500
---
---
f (MHz)/1500 (MHz)
30
1500-100000 ---
---
1.0
30
Environmental Specification:
0.2 mW/cm
2
S = (PG)/(4
π
R
2
)
(OET
Bulletin
65)
Where:
S = Power Density (mW/cm
2
)
P = Power input to the antenna (mW)
G = Power Gain of the antenna in the direction of interest relative to an isotropic radiator
R = Distance to the center of radiation of the antenna (cm)
Distance Calculation:
R =
√
((PG)/(4
π
S))
Typical Antenna Gain: 10.0 dBi 10
(10.0 dBi/10)
= 10.0
Power input to the Antenna: 37dBm = 10
(37dBm/10)
= 5000 mW
R =
√
((5000mW*10.0)/(4
π
*0.2 mW/cm
2
)) = 141 cm (Minimum Distance)
