RF Exposure

FCC ID: K6610342150

RF Exposure Info

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FCCID_1061983

FCC RF Exposure Requirements General information: FCCID: K6610342150 Device category: Mobile per Part 2.1091 Environment: Controlled Exposure Mobile devices that operate under Part 90 of this chapter are subject to routine environmental evaluation for RF exposure prior to equipment authorization or use if they operate at frequencies of 1.5 GHz or below and their effective radiated power (ERP) is 1.5 watts or more. However, compliance with the power density limits of 1.1310 is not required. Antenna: The manufacturer does not specify an antenna. A typical vehicle antenna has a gain of 0 dBd was used with this device. This device has provisions for operation in a vehicle, or a fixed location. Configuration Antenna p/n Type Max. Gain (dBd) Passenger car Any omni 0 Operating configuration and exposure conditions: The conducted output power is 70 Watts. Typical use qualifies for a maximum duty cycle factor of 50%. The manufacturer markets this device only for occupation use. - Part 2.1091 states that devices are excluded from routine evaluation if the EIRP is less than 2.46Watt (or 1.5WERP). - Vehicle Operation: A typical vehicle installation consists of an antenna system with a coaxial cable of the type RG 58 which has a loss of 1dB for a length of 15 feet. MPE Calculation: The minimum separation distance is calculated as follows: The limit for occupation/controlled exposure environment below 300 MHz is 1 mW/cm2 . 1/26/2009 Page 1 of 3 FCCID: K6610342150

Channel frequency: 29.7-37 MHz The conducted power output is 70 watt. The coax loss was taken as 1 dB. Antenna gain was taken as 0 dBd 50% talk time in 3 minutes in 6 minutes. Power in Watts Duty Factor in decimal % (1=100%) W := 70 D := 1 for an FM device D=1 Exposure time in minutes U := 6 (use 6 for controlled and 30 for uncontrolled) E := 3 E PC := percent on time Wexp := W ⋅ D⋅ ⎛⎜ ⎟ E⎞ U ⎝ U⎠ PC = 0.5 Time compensated power output Wexp = 35 Watts W1exp := Wexp⋅ 1000 4 W1exp = 3.5 × 10 mWatts ___________________________________________________________________________ Antenna gain Coax Loss For all VHF frequencies from 30 to 300 MHz dBd := 0 CL := 1 dB f := 300 G := dBd + 2.15 − CL G = 1.15 Net gain in dBi f mW Gain Numeric S := from 300 cm 2 OET 65 G 10 Gn := 10 S=1 Gn = 1.303 ( W1exp⋅ Gn) R := (4⋅ π⋅ S) R Rinches := 2.54 R = 60.246 distance in centimeters required for compliance Rinches = 23.719 W1exp 30⋅ ⋅ Gn W1exp 1000 30⋅ ⋅ Gn E := 10 R E2 := R 100 10 V E = 61.4 m E2 = 61.4 1/26/2009 Page 2 of 3 FCCID: K6610342150

Conclusion: The device complies with the MPE requirements by providing a safe separation distance of 61 cm (24 inches) between the antenna, including any radiating structure, and any persons when normally operated . Proposed RF exposure safety information to include in User’s Manual: “FCC RF Exposure Requirements: CAUTION: The antenna(s) used for this transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. This device is approved with emissions having a source-based time- averaging duty factor not exceeding 50%. Vehicle – Antenna Installation: - Antennas used for this transmitter must not exceed an antenna gain of 0 dBd with a minimum cable loss of 1dB. - For rear deck trunk and roof top installations, the antenna must be located at least 24 inches / 61 cm away from rear-seat passengers and bystanders in order to comply with the FCC RF exposure requirements. The following label will be mounted in conspicuous view on the radio. Failure to observe these restrictions will result in exceeding the FCC RF exposure limits. 1/26/2009 Page 3 of 3 FCCID: K6610342150


Document Created: 2009-01-26 16:05:20
Document Modified: 2009-01-26 16:05:20
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