Smart Route DataCollector RF Exposure Info - MPE Calculation DataCollector 915_2 Kenure Developments Ltd

Kenure Developments Ltd Smart Route DataCollector

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Document DescriptionRF Exposure Considerations
Document TypeRF Exposure Info
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KENURE DEVELOPMENTS LIMITED
THE COMPLETE DESIGN AND CONTRACT MANUFACTURE SERVICE
Registered Office: Springlakes Deadbrook Lane Aldershot Hampshire GU12 4UH
Tel: (01252) 338554 Fax:(01252) 329105
Registration No: 2265402
ISO 9001 GB13/87609
RF Exposure and Transmitter Power Considerations for
the DataCollector 915
FCC ID: Q8Q-SRDC
The FCC requires that the calculated MPE be equal to or less than a given limit
dependent on frequency
at a distance of 20 cm from a device to the body of a user.
The transmitter operation for the DataCollector 915 covers ISM 915 MHz, GSM 850 MHz
and PCS 1900 MHz operating bands.
The following FCC Rule Parts and procedures are applicable:
Part 1.1310 – Radiofrequency radiation exposure limits
Part 2.1091 – Radiofrequency radiation exposure evaluation: mobile devices
Part 15.247(b)(2) - The maximum peak conducted output power of the intentional radiator shall not exceed
the following: For frequency hopping systems operating in the 902–928 MHz band: 1 watt for systems
employing at least 50 hopping channels.
Part 15.247(b)(4) - The conducted output power limit specified in paragraph (b) of this section is based on
the use of antennas with directional gains that do not exceed 6 dBi.
Part 22.913(a)(2)
The ERP of mobile transmitters and auxiliary test transmitters must not exceed 7 Watts.
Part 24.232(c)
Mobile/ Portable stations are limited to 2 Watts EIRP peak power
KDB447498 D01 v05
Mobile and Portable Devices RF Exposure Procedures and Equipment Authorisation Policies
The MPE calculation as given in FCC OET Bulletin 65, page 19 is used to calculate the safe operating
distance for the user.
KENURE DEVELOPMENTS LIMITED
THE COMPLETE DESIGN AND CONTRACT MANUFACTURE SERVICE
Registered Office: Springlakes Deadbrook Lane Aldershot Hampshire GU12 4UH
Tel: (01252) 338554 Fax:(01252) 329105
Registration No: 2265402
ISO 9001 GB13/87609
MAXIMUM TRANSMITTER POWER CONSIDERATIONS
For ISM 915 MHz
Nominal Operating Frequency: 915 MHz
Number of Hopping Channels: 50
Max. Conducted Transmitter Power P = 28.0 dBm (631 mW) @ antenna socket
(measured).
Maximum specified antenna gain = 2.2 dBi
EIRP = 28.0 + 2.2dBm = 30.2dBm = 1047mW
Therefore the DataCollector 915 meets Part 15.247(b)(2) & 15.247(b)(4) conducted power limits (1 W).
For GSM 850 MHz
Transmitter frequency range = 824 MHz to 849 MHz
Conducted power = 33 dBm (2000 mW)
Maximum specified antenna gain = 2.0 dBi
EIRP = 33 + 2dBm = 35dBm = 3162mW
For Class 10 GPRS with 2 uplink timeslots, duty cycle = 25%
EIRP
eff
= 3162/4 = 791 mW
ERP = 35 -2.2 (dipole gain) = 32.8dBm = 1905mW
For Class 10 GPRS with 2 uplink timeslots, duty cycle = 25%
ERP
eff
= 1905/4 = 476 mW
Therefore the DataCollector 915 meets Part 22.913(a)(2) power limits (ERP 7 Watts).
Also the categorical exclusion provision of FCC Part 2.1091(c) applies as ERP
eff
< 1.5W
(with considerations of source based time averaging as per KDB 447498 Section 4.1(2))
KENURE DEVELOPMENTS LIMITED
THE COMPLETE DESIGN AND CONTRACT MANUFACTURE SERVICE
Registered Office: Springlakes Deadbrook Lane Aldershot Hampshire GU12 4UH
Tel: (01252) 338554 Fax:(01252) 329105
Registration No: 2265402
ISO 9001 GB13/87609
For PCS 1900 MHz
Transmitter frequency range = 1850 MHz to 1910 MHz
Conducted Power = 30 dBm (1000 mW)
Maximum specified antenna gain = 2.0 dBi
EIRP = 30 + 2dBm = 32dBm = 1585mW
For Class 10 GPRS with 2 uplink timeslots, duty cycle = 25%
EIRP
eff
= 1585/4 = 396 mW
Therefore the DataCollector 915 meets 24.232(c) power limits (EIRP 2 Watts).
Also the categorical exclusion provision of FCC Part 2.1091(c) applies as EIRP
eff
< 3.0W
(with considerations of source based time averaging as per KDB 447498 Section 4.1(2))
KENURE DEVELOPMENTS LIMITED
THE COMPLETE DESIGN AND CONTRACT MANUFACTURE SERVICE
Registered Office: Springlakes Deadbrook Lane Aldershot Hampshire GU12 4UH
Tel: (01252) 338554 Fax:(01252) 329105
Registration No: 2265402
ISO 9001 GB13/87609
MPE CALCULTIONS
The MPE calculation as given in FCC OET Bulletin 65, page 19 is used to calculate the
safe operating distance for the user.
S = EIRP/4 π R
2
Where S = Power density
EIRP = Effective Isotropic Radiated Power (EIRP = P x G)
P = Conducted Transmitter Power
G = Antenna Gain (relative to an isotropic radiator)
R = distance to the centre of radiation of the antenna (safe operating
distance)
For ISM 915 MHz
Values:
Transmitter frequency range = 902.5 MHz to 927.5 MHz
EIRP = 1047 mW
R = 20cm
Power Density Requirement
From table 1 (b) - Limits for General Population/ Uncontrolled Exposure of
FCC Rule Part 1.1310 for ISM 915 MHz
S = f/1500 mW/cm
2
(f = operating frequency)
S
req1
= 902.5/1500 = 0.61 mW/cm
2
(worst case)
Calculation:
S = EIRP/4 π R
2
S = 1047/(12.56 x 20
2
)
S
=
1047/(5024)
S
1
= 0.21mW/ cm
2
(<0.61 mW/cm
2
)
KENURE DEVELOPMENTS LIMITED
THE COMPLETE DESIGN AND CONTRACT MANUFACTURE SERVICE
Registered Office: Springlakes Deadbrook Lane Aldershot Hampshire GU12 4UH
Tel: (01252) 338554 Fax:(01252) 329105
Registration No: 2265402
ISO 9001 GB13/87609
For GSM 850 MHz
Values:
Transmitter frequency range = 824MHz to 849MHz
EIRP
eff
= 791 mW
R = 20cm
Power Density Requirement
From table 1 (b) - Limits for General Population/ Uncontrolled Exposure of
FCC Rule Part 1.1310 for 850MHz
S = f/1500 mW/cm
2
(f = operating frequency)
S
req2
= 824/1500 = 0.55 mW/cm
2
(worst case)
Calculation:
S = EIRP
eff
/4 π R
2
S = 791/(12.56 x 20
2
)
S
= 791/(5024)
S
2
= 0.16 mW/ cm
2
(<0.55 mW/cm
2
)
KENURE DEVELOPMENTS LIMITED
THE COMPLETE DESIGN AND CONTRACT MANUFACTURE SERVICE
Registered Office: Springlakes Deadbrook Lane Aldershot Hampshire GU12 4UH
Tel: (01252) 338554 Fax:(01252) 329105
Registration No: 2265402
ISO 9001 GB13/87609
For PCS 1900 MHz
Values:
Transmitter frequency range = 1850MHz to 1910MHz
EIRP
eff
= 396 mW
R = 20cm
Power Density Requirement
From table 1 (b) - Limits for General Population/ Uncontrolled Exposure of
FCC Rule Part 1.1310 for 1900MHz
S
req3
= 1.0 mW/cm
2
Calculation:
S = EIRP
eff
/4 π R
2
S= 396/(12.56 x 20
2
)
S
= 396/(5024)
S
3
= 0.079 mW/cm
2
(<1.0 mW/cm
2
)
KENURE DEVELOPMENTS LIMITED
THE COMPLETE DESIGN AND CONTRACT MANUFACTURE SERVICE
Registered Office: Springlakes Deadbrook Lane Aldershot Hampshire GU12 4UH
Tel: (01252) 338554 Fax:(01252) 329105
Registration No: 2265402
ISO 9001 GB13/87609
KDB447498 D01 v05 Section 7.2 SIMULTANEOUS TRANSMISSION
CONSIDERATIONS
Worst case summation of calculated MPE ratios for 915MHz and GSM or PCS
simultaneously transmitting transmitters.
ie: ΣMPE
ratios
= (S
1
/ S
req1
)
+
(S
2
/ S
req2
)
= (0.21/0.61) + (0.16/0.55)
= 0.35 + 0.29 = 0.64
Σ
of MPE ratios<1.0, so in accordance with KDB447498 Section 7.2, simultaneous
transmission test exclusion applies for the 915MHz and GSM/ PCS transmitters.
Conclusion
The required 20cm RF exposure limits for General Population/ Uncontrolled Exposure FCC Rule Part
15.247(b)(2), 22.913(a)(2) and 24.232(c) maximum transmitter power limits will not be exceeded for the
DataCollector 915 using antennas having a maximum gain of 2.2 dBi and 2.0 dBi for the ISM and GSM
antennas respectively.
Download: Smart Route DataCollector RF Exposure Info - MPE Calculation DataCollector 915_2 Kenure Developments Ltd
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Document ID1959860
Application IDZ/0/MjqKA0dkyjGaawJdqA==
Document DescriptionRF Exposure Considerations
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeYes
Document TypeRF Exposure Info
Display FormatAdobe Acrobat PDF - pdf
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Date Submitted2013-05-07 00:00:00
Date Available2013-05-08 00:00:00
Creation Date2013-05-07 16:56:46
Producing SoftwareGPL Ghostscript 8.15
Document Lastmod2013-05-07 16:56:46
Document TitleMicrosoft Word - MPE Calculation DataCollector 915_2.doc
Document CreatorPScript5.dll Version 5.2.2
Document Author: John Mathews

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