SAR Report

FCC ID: 2ATSN-ROCKY1

RF Exposure Info

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FCCID_4406969

Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

TABLE OF CONTENTS

DOCUMENT REVISION HISTORY ......................................................................................................................... 4
EUT DESCRIPTION .................................................................................................................................................... 5
TECHNICAL SPECIFICATION ......................................................................................................................................... 5
REFERENCE, STANDARDS, AND GUIDELINES.................................................................................................. 6
SAR LIMITS ................................................................................................................................................................. 7
FACILITIES .................................................................................................................................................................. 8
DESCRIPTION OF TEST SYSTEM .......................................................................................................................... 9
EQUIPMENT LIST AND CALIBRATION ............................................................................................................. 14
EQUIPMENTS LIST & CALIBRATION INFORMATION .................................................................................................... 14
SAR MEASUREMENT SYSTEM VERIFICATION .............................................................................................. 15
LIQUID VERIFICATION ............................................................................................................................................... 15
SYSTEM ACCURACY VERIFICATION ........................................................................................................................... 16
SAR SYSTEM VALIDATION DATA ..................................................................................................................... 17
EUT TEST STRATEGY AND METHODOLOGY ................................................................................................. 18
TEST POSITIONS FOR DEVICE OPERATING NEXT TO A PERSON’S EAR........................................................................ 18
CHEEK/TOUCH POSITION ........................................................................................................................................... 19
EAR/TILT POSITION ................................................................................................................................................... 19
TEST POSITIONS FOR BODY-WORN AND OTHER CONFIGURATIONS .............................................................................. 20
TEST DISTANCE FOR SAR EVALUATION .................................................................................................................... 20
SAR EVALUATION PROCEDURE ................................................................................................................................. 21
OUTPUT POWER MEASUREMENT...................................................................................................................... 22
PROVISION APPLICABLE ............................................................................................................................................ 22
TEST PROCEDURE ...................................................................................................................................................... 22
MAXIMUM TARGET OUTPUT POWER ......................................................................................................................... 22
TEST RESULTS: .......................................................................................................................................................... 23
SAR MEASUREMENT RESULTS ........................................................................................................................... 24
SAR TEST DATA ........................................................................................................................................................ 24
TEST RESULT: ............................................................................................................................................................ 24
SAR MEASUREMENT VARIABILITY .................................................................................................................. 25
SAR PLOTS ................................................................................................................................................................. 26
APPENDIX A MEASUREMENT UNCERTAINTY ............................................................................................... 30
APPENDIX B EUT TEST POSITION PHOTOS .................................................................................................... 32
APPENDIX C CALIBRATION CERTIFICATES .................................................................................................. 33

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

DOCUMENT REVISION HISTORY

Revision Number Report Number Description of Revision Date of Revision

1.0 RXM190625054-20 Original Report 2019-08-01

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

EUT DESCRIPTION

This report has been prepared on behalf of LedgeTech LLC and their product FRS ANALOG RADIO,
Model: Rocky Talkie, FCC ID: 2ATSN-ROCKY1, or the EUT (Equipment under Test) as referred to in
the rest of this report.

*All measurement and test data in this report was gathered from production sample serial number: 19062505421
(Assigned by BACL).The EUT supplied by the applicant was received on 2019-06-27.

Technical Specification

Device Type: Portable
Exposure Category: General Population/Uncontrolled Exposure
Antenna Type(s): Integral Antenna
Body-Worn Accessories: Belt Clip
Face-Head Accessories: None
Modulation Type: PTT_FM
Frequency Band: 462.5500 - 467.7125 MHz
ERP Power: 28.77 dBm
Power Source: DC 3.7 V by rechargeable Li-polymer battery
Normal Operation: Face Up and Body-worn

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

REFERENCE, STANDARDS, AND GUIDELINES

FCC:

The Report and Order requires routine SAR evaluation prior to equipment authorization of portable
transmitter devices, including portable telephones. For consumer products, the applicable limit is 1.6 mW/g
as recommended by the ANSI/IEEE standard C95.1-1992 [6] for an uncontrolled environment (Paragraph
65). According to the Supplement C of OET Bulletin 65 “Evaluating Compliance with FCC Guide-lines for
Human Exposure to Radio frequency Electromagnetic Fields", released on Jun 29, 2001 by the FCC, the
device should be evaluated at maximum output power (radiated from the antenna) under “worst-case”
conditions for normal or intended use, incorporating normal antenna operating positions, device peak
performance frequencies and positions for maximum RF energy coupling.

This report describes the methodology and results of experiments performed on wireless data terminal. The
objective was to determine if there is RF radiation and if radiation is found, what is the extent of radiation
with respect to safety limits. SAR (Specific Absorption Rate) is the measure of RF exposure determined by
the amount of RF energy absorbed by human body (or its parts) – to determine how the RF energy couples
to the body or head which is a primary health concern for body worn devices. The limit below which the
exposure to RF is considered safe by regulatory bodies in North America is 1.6 mW/g average over 1 gram
of tissue mass.

CE:

The order requires routine SAR evaluation prior to equipment authorization of portable transmitter devices,
including portable telephones. For consumer products, the applicable limit is 2 mW/g as recommended by
EN62209-1 for an uncontrolled environment. According to the Standard, the device should be evaluated at
maximum output power (radiated from the antenna) under “worst-case” conditions for normal or intended
use, incorporating normal antenna operating positions, device peak performance frequencies and positions
for maximum RF energy coupling.

This report describes the methodology and results of experiments performed on wireless data terminal. The
objective was to determine if there is RF radiation and if radiation is found, what is the extent of radiation
with respect to safety limits. SAR (Specific Absorption Rate) is the measure of RF exposure determined by
the amount of RF energy absorbed by human body (or its parts) – to determine how the RF energy couples
to the body or head which is a primary health concern for body worn devices. The limit below which the
exposure to RF is considered safe by regulatory bodies in Europe is 2 mW/g average over 10 gram of tissue
mass.

The test configurations were laid out on a specially designed test fixture to ensure the reproducibility of
measurements. Each configuration was scanned for SAR. Analysis of each scan was carried out to
characterize the above effects in the device.

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

SAR Limits

FCC Limit

SAR (W/kg)
(General Population / (Occupational /
EXPOSURE LIMITS
Uncontrolled Exposure Controlled Exposure
Environment) Environment)
Spatial Average
0.08 0.4
(averaged over the whole body)
Spatial Peak
1.60 8.0
(averaged over any 1 g of tissue)
Spatial Peak
(hands/wrists/feet/ankles 4.0 20.0
averaged over 10 g)

CE Limit

SAR (W/kg)
(General Population / (Occupational /
EXPOSURE LIMITS Uncontrolled Exposure Controlled Exposure
Environment) Environment)
Spatial Average
0.08 0.4
(averaged over the whole body)
Spatial Peak
(averaged over any 10 g of 2.0 10
tissue)
Spatial Peak
(hands/wrists/feet/ankles 4.0 20.0
averaged over 10 g)

Population/Uncontrolled Environments are defined as locations where there is the exposure of
individual who have no knowledge or control of their exposure.
Occupational/Controlled Environments are defined as locations where there is exposure that may
be incurred by people who are aware of the potential for exposure (i.e. as a result of employment
or occupation).

General Population/ Uncontrolled environments Spatial Peak limit 1.6 W/kg (FCC) & 2.0 W/kg (CE)
applied to the EUT.

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FACILITIES

The Test site used by Bay Area Compliance Laboratories Corp. (Dongguan) to collect test data is located
on the No.69 Pulongcun, Puxinhu Industry Area, Tangxia, Dongguan, Guangdong, China.

The test site has been approved by the FCC under the KDB 974614 D01 and is listed in the FCC Public
Access Link (PAL) database, FCC Registration No. : 897218,the FCC Designation No. : CN1220.

The lab has been recognized by Innovation, Science and Economic Development Canada to test to
Canadian radio equipment requirements, the CAB identifier : CN0022.

The test sites and measurement facilities used to collect data are located at:

SAR Lab 1 SAR Lab 2

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

EX3DV4 E-Field Probes

Frequency 10 MHz to > 6 GHz
Linearity: ± 0.2 dB (30 MHz to 6 GHz)

Directivity ± 0.3 dB in TSL (rotation around probe axis)
± 0.5 dB in TSL (rotation normal to probe axis)

Dynamic 10 µW/g to > 100 mW/g
Range Linearity: ± 0.2 dB (noise: typically < 1 µW/g)

Dimensions Overall length: 337 mm (Tip: 20 mm)
Tip diameter: 2.5 mm (Body: 12 mm)
Typical distance from probe tip to dipole centers: 1 mm

Application High precision dosimetric measurements in any exposure scenario
(e.g., very strong gradient fields); the only probe that enables
compliance testing for frequencies up to 6 GHz with precision of
better 30%.

Compatibility DASY3, DASY4, DASY52 SAR and higher, EASY4/MRI

Robots

The DASY5 system uses the high precision industrial robot. The robot offers the same features important
for our application:
 High precision (repeatability 0.02mm)
 High reliability (industrial design)
 Low maintenance costs (virtually maintenance free due to direct drive gears; no belt drives)
 Jerk-free straight movements (brushless synchrony motors; no stepper motors)
 Low ELF interference (motor control fields shielded via the closed metallic construction shields)

The above mentioned robots are controlled by the Staubli CS8c robot controllers. All information regarding
the use and maintenance of the robot arm and the robot controller is contained on the CDs delivered along
with the robot. Paper manuals are available upon request direct from Staubli.

Area Scans

Area scans are defined prior to the measurement process being executed with a user defined variable
spacing between each measurement point (integral) allowing low uncertainty measurements to be
conducted. Scans defined for FCC applications utilize a 15mm 2 step integral, with 1.5mm interpolation
used to locate the peak SAR area used for zoom scan assessments.

Where the system identifies multiple SAR peaks (which are within 25% of peak value) the system will
provide the user with the option of assessing each peak location individually for zoom scan averaging.

Zoom Scan (Cube Scan Averaging)

The averaging zoom scan volume utilized in the DASY5 software is in the shape of a cube and the side
dimension of a 1 g or 10 g mass is dependent on the density of the liquid representing the simulated tissue.
A density of 1000 kg/m3 is used to represent the head and body tissue density and not the phantom liquid
density, in order to be consistent with the definition of the liquid dielectric properties, i.e. the side length of
the 1g cube is 10mm,with the side length of the 10g cube is 21.5mm.

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

When the cube intersects with the surface of the phantom, it is oriented so that 3 vertices touch the surface
of the shell or the center of a face is tangent to the surface. The face of the cube closest to the surface is
modified in order to conform to the tangent surface.

The zoom scan integer steps can be user defined so as to reduce uncertainty, but normal practice for typical
test applications (including FCC) utilize a physical step of 7 x7 x 7 (5mmx5mmx5mm) providing a volume
of 30 mm in the X & Y & Z axis.

Tissue Dielectric Parameters for Head and Body Phantoms

The head tissue dielectric parameters recommended by the IEEE SCC-34/SC-2 in P1528 have been
incorporated in the following table. These head parameters are derived from planar layer models simulating
the highest expected SAR for the dielectric properties and tissue thickness variations in a human head.
Other head and body tissue parameters that have not been specified in P1528 are derived from the tissue
dielectric parameters computed from the 4-Cole-Cole equations described in Reference [12] and
extrapolated according to the head parameters specified in P1528.

Recommended Tissue Dielectric Parameters for Head and Body

Frequency Head Tissue Body Tissue
(MHz) εr Ơ (S/m) εr Ơ (S/m)
150 52.3 0.76 61.9 0.80
300 45.3 0.87 58.2 0.92
450 43.5 0.87 56.7 0.94
835 41.5 0.90 55.2 0.97
900 41.5 0.97 55.0 1.05
915 41.5 0.98 55.0 1.06
1450 40.5 1.20 54.0 1.30
1610 40.3 1.29 53.8 1.40
1800-2000 40.0 1.40 53.3 1.52
2450 39.2 1.80 52.7 1.95
3000 38.5 2.40 52.0 2.73
5800 35.3 5.27 48.2 6.00

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

IEC 62209-1:2016 Recommended Tissue Dielectric Parameters

Frequency Head Tissue
(MHz) εr Ơ (S/m)
150 52.3 0.76
300 45.3 0.87
450 43.5 0.87
835 41.5 0.90
900 41.5 0.97
915 41.5 0.98
1450 40.5 1.20
1610 40.3 1.29
1800-2000 40.0 1.40
2450 39.2 1.80
3000 38.5 2.40
5800 35.3 5.27

Note:
1, Effective February 19, 2019, FCC has permitted the use of single head-tissue simulating liquid specified in
IEC 62209-1 for all SAR tests.
2, Mix and Match of traditional FCC SAR TSLs and IEC 62209-1 TSL in a single application is not permitted
TSL can be changed in a Permissive Change.
3, If SAR increases and original SAR > 1.2 W/kg, additional SAR measurements will be required IEC 62209-1
TSL is an alternative, not mandatory at this time.
4, If FCC parameters are used, ±5% tolerance. If IEC parameters, ±10%.
5, In this case, IEC parameters applied.

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

EQUIPMENT LIST AND CALIBRATION

Equipments List & Calibration Information

Calibration Calibration
Equipment Model S/N
Date Due Date

DASY5 Test Software DASY52.8 N/A NCR NCR
DASY5 Measurement Server DASY5 4.5.12 1470 NCR NCR
Data Acquisition Electronics DAE3 471 2018/12/3 2019/12/3
E-Field Probe ES3DV2 3019 2018/8/20 2019/8/20
Dipole, 450MHz D450V3 1096 2016/11/07 2019/11/06
Mounting Device MD4HHTV5 SD 000 H01 KA NCR NCR
Oval Flat Phantom ELI V8.0 2051 NCR NCR
Simulated Tissue 450 MHz Head and Body TS-450-HB 1709045001 Each Time /
Network Analyzer 8753C 3033A02857 2018/8/3 2019/8/3
Dielectric assessment kit 1253 SM DAK 040 CA NCR NCR
Signal Generator 8665B 3438a00584 2018/7/19 2019/7/19
Power Meter E4419B MY45103907 2019/5/9 2020/5/8
Power Amplifier ZVA-183-S+ 5969001149 NCR NCR
Directional Coupler 441493 520Z NCR NCR
Attenuator 20dB, 100W N/A NCR NCR
Attenuator 3dB, 150W N/A NCR NCR

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

SAR Evaluation Procedure

The evaluation was performed with the following procedure:

Step 1: Measurement of the SAR value at a fixed location above the ear point or central position was
used as a reference value for assessing the power drop. The SAR at this point is measured at the start
of the test and then again at the end of the testing.

Step 2: The SAR distribution at the exposed side of the head was measured at a distance of 4 mm
from the inner surface of the shell. The area covered the entire dimension of the head or radiating
structures of the EUT, the horizontal grid spacing was 15 mm x 15 mm, and the SAR distribution was
determined by integrated grid of 1.5mm x 1.5mm. Based on these data, the area of the maximum
absorption was determined by spline interpolation. The first Area Scan covers the entire dimension of
the EUT to ensure that the hotspot was correctly identified.

Step 3: Around this point, a volume of 30 mm x 30 mm x 30 mm was assessed by measuring 7x 7 x 7
points. On the basis of this data set, the spatial peak SAR value was evaluated under the following
procedure:

1) The data at the surface were extrapolated, since the center of the dipoles is 1.2 mm away
from the tip of the probe and the distance between the surface and the lowest measuring point is
1.3 mm. The extrapolation was based on a least square algorithm. A polynomial of the fourth
order was calculated through the points in z-axes. This polynomial was then used to evaluate the
points between the surface and the probe tip.

2) The maximum interpolated value was searched with a straightforward algorithm. Around this
maximum the SAR values averaged over the spatial volumes (1 g or 10 g) were computed by the
3D-Spline interpolation algorithm. The 3D-Spline is composed of three one dimensional splines
with the “Not a knot"-condition (in x, y and z-directions). The volume was integrated with the
trapezoidal-algorithm. One thousand points (10 x 10 x 10) were interpolated to calculate the
averages.

All neighboring volumes were evaluated until no neighboring volume with a higher average
value was found.

Step 4: Re-measurement of the SAR value at the same location as in Step 1. If the value changed by
more than 5%, the evaluation was repeated.

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

SAR MEASUREMENT RESULTS

This page summarizes the results of the performed dosimetric evaluation.
SAR Test Data
Environmental Conditions

Temperature: 23.4-24.1 ℃
Relative Humidity: 45%
ATM Pressure: 100.1 kPa
Test Date: 2019/07/06
Testing was performed by Brave Lu.

Test Result:
Max. Max. 1 g SAR Value(W/kg)
Power
Frequency Worn Meas. Rated
Test Mode Drift
(MHz) accessories Power Power Scaled Meas.
50%
Scaled
Plot
(dB)
(dBm) (dBm) Factor SAR SAR
Head 462.6375 Belt Clip -0.03 28.77 28.9 1.03 1.26 0.63 0.65 1#
Face Up
(25 mm) 467.6375 Belt Clip 0.02 21.69 21.8 1.026 0.324 0.162 0.17 2#
FM
(12.5 kHz)
Body 462.6375 Belt Clip -0.18 28.77 28.9 1.03 2.3 1.15 1.18 3#
Back
(0 mm) 467.6375 Belt Clip 0.09 21.69 21.8 1.026 0.395 0.198 0.20 4#

Note:
1. For a PTT, only simplex communication technology was supported, so the SAR value need to be corrected
by Multiplying 50%.
2. Passive body-worn and audio accessories generally do not apply to the head SAR of PTT radios.
3. The whole antenna and radiating structures that may contribute to the measured SAR or influence the SAR
distribution has been included in the area scan.

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

SAR Measurement Variability

In accordance with published RF Exposure KDB procedure 865664 D01 SAR measurement 100 MHz to 6
GHz v01. These additional measurements are repeated after the completion of all measurements requiring
the same head or body tissue-equivalent medium in a frequency band. The test device should be returned
to ambient conditions (normal room temperature) with the battery fully charged before it is re-mounted on
the device holder for the repeated measurement(s) to minimize any unexpected variations in the repeated
results
1) Repeated measurement is not required when the original highest measured SAR is < 0.80 W/kg.
2) When the original highest measured SAR is ≥ 0.80 W/kg, repeat that measurement once.
3) Perform a second repeated measurement only if the ratio of largest to smallest SAR for the
original and first repeated measurements is > 1.20 or when the original or repeated measurement
is ≥ 1.45 W/kg (~ 10% from the 1-g SAR limit).
4) Perform a third repeated measurement only if the original, first or second repeated measurement is
≥1.5 W/kg and the ratio of largest to smallest SAR for the original, first and second repeated
measurements is > 1.20.
5) The same procedures should be adapted for measurements according to occupational exposure
limits by applying a factor of 2.5 for extremity exposure and a factor of 5 for occupational
exposure to the corresponding SAR thresholds.

Note: The same procedures should be adapted for measurements according to extremity and occupational
exposure limits by applying a factor of 2.5 for extremity exposure and a factor of 5 for occupational
exposure to the corresponding SAR thresholds.

The Highest Measured SAR Configuration in Each Frequency Band
Head(Face Up)

Meas. SAR (W/kg) Largest to
SAR probe Frequency
Freq.(MHz) EUT Position Smallest
calibration point Band
Original Repeated SAR Ratio
450MHz
FM 462.6375 Head Face Up 1.26 1.22 1.03
(350-550 MHz)

Body(Body Back)

Meas. SAR (W/kg) Largest to
SAR probe Frequency
Freq.(MHz) EUT Position Smallest
calibration point Band
Original Repeated SAR Ratio
450MHz
FM 462.6375 Body Back 2.3 2.24 1.03
(350-550 MHz)

Note:
1. Second Repeated Measurement is not required since the ratio of the largest to smallest SAR for the original
and first repeated measurement is not > 1.20.
2. The measured SAR results do not have to be scaled to the maximum tune-up tolerance to determine if
repeated measurements are required.
3. SAR measurement variability must be assessed for each frequency band, which is determined by the SAR
probe calibration point and tissue-equivalent medium used for the device measurements.

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

APPENDIX B EUT TEST POSITION PHOTOS

Please Refer to the Attachment.

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Bay Area Compliance Laboratories Corp. (Dongguan) Report No.: RXM190625054-20

APPENDIX C CALIBRATION CERTIFICATES

Please Refer to the Attachment.

***** END OF REPORT *****

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Document Created: 2019-08-14 14:01:58
Document Modified: 2019-08-14 14:01:58

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