Test Report

FCC ID: MRXG6GB4

Test Report

Download: PDF

FCCID_4130269

Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

Revision History

Rev. No. Date Details Revised By

r0 December 23, 2018 Initial Release. J. Brunett
r1 January 10, 2019 Minor typo + sigs. J. Brunett

Contents
Revision History 2

Table of Contents 2

1 Test Report Scope and Limitations 4
1.1 Laboratory Authorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Report Retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Subcontracted Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Test Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Limitation of Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.6 Copyright . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.7 Endorsements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.8 Test Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.9 Traceability and Equipment Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Test Specifications and Procedures 6
2.1 Test Specification and General Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Configuration and Identification of the Equipment Under Test 7
3.1 Description and Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.1 EUT Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.2 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.3 Variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.4 Test Samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.5 Functional Exerciser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.6 Modifications Made . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.7 Production Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1.8 Declared Exemptions and Additional Product Notes . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Emissions 9
4.1 General Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.1 Radiated Test Setup and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.2 Conducted Emissions Test Setup and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1.3 Power Supply Variation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Intentional Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.1 Fundamental Emission Pulsed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.2 Fundamental Emission Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.3 Fundamental Emission Field Strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3 Unintentional Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.1 Transmit Chain Spurious Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5 Measurement Uncertainty and Accreditation Documents 19

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Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

List of Tables
1 Test Site List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Equipment List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 EUT Declarations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Fundamental Emission Pulsed Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Fundamental Emission Bandwidth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Fundamental Emission Field Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Transmit Chain Spurious Emissions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Measurement Uncertainty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

List of Figures
1 Photos of EUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 EUT Test Configuration Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Radiated Emissions Diagram of the EUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Radiated Emissions Test Setup Photograph(s). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Fundamental Emission Pulsed Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Fundamental Emission Pulsed Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Fundamental Emission Bandwidth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Accreditation Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

1 Test Report Scope and Limitations
1.1 Laboratory Authorization
Test Facility description and attenuation characteristics are on file with the FCC Laboratory, Columbia, Maryland
(FCC Reg. No: US5348 and US5356) and with ISED Canada, Ottawa, ON (File Ref. No: 3161A and 24249). Amber
Helm Development L.C. holds accreditation under NVLAP Lab Code 200129-0.

1.2 Report Retention
For equipment verified to comply with the regulations herein, the manufacturer is obliged to retain this report with
the product records for the life of the product, and no less than ten years. A copy of this Report will remain on file
with this laboratory until December 2028.

1.3 Subcontracted Testing
This report does not contain data produced under subcontract.

1.4 Test Data
This test report contains data included within the laboratories scope of accreditation.

1.5 Limitation of Results
The test results contained in this report relate only to the item(s) tested. Any electrical or mechanical modification
made to the test item subsequent to the test date shall invalidate the data presented in this report. Any electrical
or mechanical modification made to the test item subsequent to this test date shall require reevaluation.

1.6 Copyright
This report shall not be reproduced, except in full, without the written approval of Amber Helm Development L.C..

1.7 Endorsements
This report shall not be used to claim product endorsement by any accrediting, regulatory, or governmental agency.

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Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

EUT
Schrader Electronics
FCC ID: MRXG6GB4
IC: 2546A-G6GB4

Figure 2: EUT Test Configuration Diagram.

3.1.3 Variants
There are two variants of the EUT. Both employ the exact same PCB and software, but the plastic housing (chassis)
into which they are placed consist of a smaller version G6GB4-F and a larger version G6GB4-D. Fundamental and
harmonic spurious are measured in both housings.

3.1.4 Test Samples
Four samples in total were provided; two normal operating and one capable of CW after application of a special LF
test tool for each housing variant. The normal operating samples were tested for LF activation response using an
LF diagnostic tool provided by the manufacturer.

3.1.5 Functional Exerciser
Normal operating EUT functionality was verified by observation of transmitted signal.

3.1.6 Modifications Made
There were no modifications made to the EUT by this laboratory.

3.1.7 Production Intent
The EUT appears to be a production ready sample.

3.1.8 Declared Exemptions and Additional Product Notes
The EUT is permanently installed in a transportation vehicle. As such, digital emissions are exempt from US and
Canadian digital emissions regulations (per FCC 15.103(a) and IC correspondence on ICES-003).
The EUT also employs some modes of operation that alert the vehicle user of sudden changes in tire pressure.
Such alert modes fall under FCC 15.231(a)(4), and may operate during the pendency of the alarm condition. A
detailed list of all operating modes is included in the Description of Operation exhibit included in this application.

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Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

4 Emissions
4.1 General Test Procedures
4.1.1 Radiated Test Setup and Procedures
Radiated electromagnetic emissions from the EUT are first pre-scanned in our screen room. Spectrum and modulation
characteristics of all emissions are recorded. Instrumentation, including spectrum analyzers and other test equipment
as detailed in Section 1.8 are employed. After pre-scan, emission measurements are made on the test site of record.
If the EUT connects to auxiliary equipment and is table or floor standing, the configurations prescribed in relevant
test standards are followed. Alternatively, a layout closest to normal use (as declared by the provider) is employed
if the resulting emissions appear to be worst-case in such a configuration. See Figure 3. All intentionally radiating
elements that are not fixed-mounted in use are placed on the test table lying flat, on their side, and on their end
(3-axes) and the resulting worst case emissions are recorded. If the EUT is fixed-mounted in use, measurements are
made with the device oriented in the manner consistent with installation and then emissions are recorded. If the
EUT exhibits spurious emissions due to internal receiver circuitry, such emissions are measured with an appropriate
carrier signal applied.

Long Interface Cables
EUT Power Long Interface Cables
(to AUX) AUX Power
(to EUT)

Equipment Under Test Auxiliary
(EUT)
Short Interface Cables Equipment
(AUX)

Radiated Emissions Table

Figure 3: Radiated Emissions Diagram of the EUT.

For devices with intentional emissions below 30 MHz, a shielded loop antenna and/or E-field and H-Field broad-
band probes are used depending on the regulations. Shielded loops are placed at a 1 meter receive height at the desired
measurement distance. For exposure in this band, the broadband probes employed are 10cm diameter single-axis
shielded transducers and measurements are repeated and summed over three axes.
Emissions between 30 MHz and 1 GHz are measured using calibrated broadband antennas. For both horizontal
and vertical polarizations, the test antenna is raised and lowered from 1 to 4 m in height until a maximum emission
level is detected. The EUT is then rotated through 360o in azimuth until the highest emission is detected. The test
antenna is then raised and lowered one last time from 1 to 4 m and the worst case value is recorded. Emissions
above 1 GHz are characterized using standard gain or broadband ridge-horn antennas on our OATS with a 4 × 5
m rectangle of ECCOSORB absorber covering the OATS ground screen and a 1.5m table height. Care is taken to
ensure that test receiver resolution and video bandwidths meet the regulatory requirements, and that the emission
bandwidth of the EUT is not reduced. Photographs of the test setup employed are depicted in Figure 4.
Where regulations allow for direct measurement of field strength, power values (dBm) measured on the test
receiver / analyzer are converted to dBµV/m at the regulatory distance, using

Edist = 107 + PR + KA − KG + KE − CF

where PR is the power recorded on spectrum analyzer, in dBm, KA is the test antenna factor in dB/m, KG is the
combined pre-amplifier gain and cable loss in dB, KE is duty correction factor (when applicable) in dB, and CF is
a distance conversion (employed only if limits are specified at alternate distance) in dB. This field strength value is
then compared with the regulatory limit. If effective isotropic radiated power (EIRP) is computed, it is computed as

EIRP (dBm) = E3m (dBµV /m) − 95.2.

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Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

4.1.2 Conducted Emissions Test Setup and Procedures
The EUT is not subject to measurement of power line conducted emissions as it is powered solely by its internal
battery.

4.1.3 Power Supply Variation
Tests at extreme supply voltages are made if required by the procedures specified in the test standard, and results
of this testing are detailed in this report.
In the case the EUT is designed for operation from a battery power source, the extreme test voltages are evaluated
over the range specified in the test standard; no less than ±10% of the nominal battery voltage declared by the
manufacturer. For all battery operated equipment, worst case intentional and spurious emissions are re-checked
employing a new (fully charged) battery.

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Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

4.2 Intentional Emissions
4.2.1 Fundamental Emission Pulsed Operation
Test Setup & Procedure The test equipment and facilities were setup in accordance with the standards and
procedures listed in Section 2.1. Environmental conditions were set at the appropriate temperature and thermal
balance was checked with a thermocouple based probe. Duty cycle is reported for all relevant modes of operation.
The test equipment employed includes RSFSV30001, LOGEMCO01.

Measurement Results The details and results of testing the EUT are summarized in Table 4. Plots showing the
measurements made to obtain these values are provided in Figure 5.

Table 4: Fundamental Emission Pulsed Operation.

Test Date: 5-Dec-18
Detector Span IF Bandwidth Video Bandwidth Test Engineer: Joseph Brunett
Pk 0 3 MHz 3 MHz EUT: Schrader G6GB4-F, G6GB4-D
EUT Mode: Modulated
Meas. Distance: 10 cm

FCC/IC
Overall Transmission Internal Frame Characteristics
Min. Max. Total Computed Duty Cycle
Frequency Repetition No. of Transmission Max. Frame Min. Frame
# (MHz) EUT Test Mode* Rate (sec) Frames Length (sec) Length (ms) Period (ms) Frame Encoding (%) (dB)

In Drive (Roll) mode the EUT transmits 6 FSK
1 433.92 Drive Mode 21.7 8 0.5739 5.900 <100 ms frames. Two frames may occur within 100 ms 11.8 -18.6
window.

When manually activated by LF service tool, the
EUT transmits 16 ASK and FSK frames in 1.71
2 433.92 LF Manual Activated single 16 1.71 50.120 100.0 seconds. Only a single frame may occur in a 25.1 -12.0
given 100ms window, and the worst case frame is
a 50.12 ms ASK frame with 50% duty.

Example Calculation: Worst Case Duty (%) = (50% x 50.12 ms/ 100 ms ) x 100 = 25.1 %

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Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

4.2.2 Fundamental Emission Bandwidth
Test Setup & Procedure The test equipment and facilities were setup in accordance with the standards and
procedures listed in Section 2.1. Environmental conditions were set at the appropriate temperature and thermal
balance was checked with a thermocouple based probe. Emission bandwidth (EBW) of the EUT is measured with
the device placed in the test mode(s) with the shortest available frame length and minimum frame spacing. The
20 dB EBW is measured as the max-held peak-detected signal when the IF bandwidth is greater than or equal to
1% of the receiver span. For complex modulations other than ASK and FSK, the 99% emission bandwidth per IC
test procedures has a different result, and is also reported. The test equipment employed includes RSFSV30001,
LOGEMCO01.

Measurement Results The details and results of testing the EUT are summarized in Table 5. Plots showing the
measurements made to obtain these values are provided in Figure 6.

Table 5: Fundamental Emission Bandwidth.

Test Date: 5-Dec-18
Detector IF Bandwidth Video Bandwidth Test Engineer: Joseph Brunett
Pk 10 kHz 30 kHz EUT: Schrader G6GB4-F, G6GB4-D
EUT Mode: Normal
Meas. Distance: 10 cm

FCC/IC
Center Frequency 20 dB EBW EBW Limit 99% OBW
# Modulation (MHz) (MHz) (MHz) (MHz)
1 ASK+FSK 433.92 0.262 1.0848 0.441
2

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Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

4.2.3 Fundamental Emission Field Strength
Test Setup & Procedure The test equipment and facilities were setup in accordance with the standards and
procedures listed in Section 2.1. Environmental conditions were set at the appropriate temperature and thermal
balance was checked with a thermocouple based probe. Fundamental emissions are measured at the regulatory
distance on our OATS. The test equipment employed includes RSFSV30001, LOGEMCO01.

Measurement Results The details and results of testing the EUT are summarized in Table 6.

Table 6: Fundamental Emission Field Strength.

Frequency Range Det IF Bandwidth Video Bandwidth Test Date: 5-Nov-18
25 MHz ≤ f ≤ 1 000 MHz Pk/QPk 120 kHz 300 kHz Test Engineer: Joseph Brunett
EUT: Schrader G6GB4-F, G6GB4-D
EUT Mode: CW
Meas. Distance: 3 meters

FCC/IC
Freq. Ant. Ant. Table Azim. Ant Height Ka Kg E3(Pk) E3(Avg)* FCC/IC E3(Pk) FCC/IC E3(Avg) Pass
# MHz Used Pol. deg m dB/m dB dBµV/m dBµV/m Lim. dBµV/m Lim. dBµV/m dB Comments
1 G6GB4-F Variant
2 433.9 LOGEMCO01 H 90.0 1.0 16.3 -1.5 74.6 62.6 92.8 72.8 10.2 end
3 433.9 LOGEMCO01 V .0 1.3 16.3 -1.5 74.3 62.3 92.8 72.8 10.5 side
4 G6GB4-D Variant
5 433.9 LOGEMCO01 H 90.0 1.0 16.3 -1.5 72.3 60.3 92.8 72.8 12.5 end
6 433.9 LOGEMCO01 V .0 1.3 16.3 -1.5 73.4 61.4 92.8 72.8 11.4 side
*Avg data computed from Peak Measured Data and EUT Duty Cycle. EUT in CW mode.

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Date: December 23, 2018 Prepared For: Schrader Electronics Report No.: SCHTP-WR1808TX

4.3 Unintentional Emissions
4.3.1 Transmit Chain Spurious Emissions
Test Setup & Procedure The test equipment and facilities were setup in accordance with the standards and
procedures listed in Section 2.1. Environmental conditions were set at the appropriate temperature and thermal
balance was checked with a thermocouple based probe. Spurious radiated emissions measurements are performed
to 10 times the highest fundamental operating frequency. The test equipment employed includes RSFSV30001,
LOGEMCO01, HQR2TO18S01.

Measurement Results The details and results of testing the EUT are summarized in Table 7.

Table 7: Transmit Chain Spurious Emissions.

Frequency Range Det IF Bandwidth Video Bandwidth Test Date: 5-Nov-18
25 MHz ≤ f ≤ 1 000 MHz Pk/QPk 120 kHz 300 kHz Test Engineer: Joseph Brunett
f > 1 000 MHz Pk 1 MHz 3 MHz EUT: Schrader G6GB4-F, G6GB4-D
f > 1 000 MHz Avg 1 MHz 10kHz EUT Mode: CW
Meas. Distance: 3 meters

Transmitter Unintentional Spurious Emissions FCC/IC
Freq. Ant. Ant. Table Azim. Ant Height Ka Kg E3(Pk) E3(Avg)* FCC/IC E3lim (Pk) FCC/IC E3lim (Avg) Pass
# MHz Used Pol. deg m dB/m dB dBµV/m dBµV/m dBµV/m dBµV/m dB Comments
1 G6GB4-F Variant
2 867.8 LOGEMCO01 H 90.0 1.10 22.2 -2.8 42.3 30.3 72.8 52.8 22.5 end
3 867.8 LOGEMCO01 V .0 1.20 22.2 -6.9 43.2 31.2 72.8 52.8 21.6 side
4 1301.8 HQR1TO18S01 H/V max all 1.50 32.4 -3.5 37.8 25.8 74.0 54.0 28.2 max all, noise
5 1735.7 HQR1TO18S01 H/V max all 1.50 30.4 -4.2 42.8 30.8 74.0 54.0 23.2 max all, noise
6 2169.6 HQR1TO18S01 H/V max all 1.50 29.8 -4.8 53.4 41.4 74.0 54.0 12.6 max all
7 2603.5 HQR1TO18S01 H/V max all 1.50 30.1 -5.3 55.8 43.8 74.0 54.0 10.2 max all
8 3037.4 HQR1TO18S01 H/V max all 1.50 30.7 -5.7 48.7 36.7 74.0 54.0 17.3 max all
9 3471.4 HQR1TO18S01 H/V max all 1.50 31.3 -6.1 44.8 32.8 74.0 54.0 21.2 max all, noise
10 3905.3 HQR1TO18S01 H/V max all 1.50 31.8 -6.4 47.9 35.9 74.0 54.0 18.1 max all, noise
11 4339.2 HQR1TO18S01 H/V max all 1.50 32.1 -6.7 43.1 31.1 74.0 54.0 22.9 max all, noise
12 G6GB4-D Variant
13 867.8 LOGEMCO01 H 90.0 1.10 22.2 -2.8 41.8 29.8 72.8 52.8 23.0 end
14 867.8 LOGEMCO01 V .0 1.20 22.2 -6.9 42.0 30.0 72.8 52.8 22.8 side
15 1301.8 HQR1TO18S01 H/V max all 1.50 32.4 -3.5 34.7 22.7 74.0 54.0 31.3 max all, noise
16 1735.7 HQR1TO18S01 H/V max all 1.50 30.4 -4.2 41.2 29.2 74.0 54.0 24.8 max all, noise
17 2169.6 HQR1TO18S01 H/V max all 1.50 29.8 -4.8 55.3 43.3 74.0 54.0 10.7 max all
18 2603.5 HQR1TO18S01 H/V max all 1.50 30.1 -5.3 54.1 42.1 74.0 54.0 11.9 max all
19 3037.4 HQR1TO18S01 H/V max all 1.50 30.7 -5.7 50.9 38.9 74.0 54.0 15.1 max all
20 3471.4 HQR1TO18S01 H/V max all 1.50 31.3 -6.1 44.3 32.3 74.0 54.0 21.7 max all, noise
21 3905.3 HQR1TO18S01 H/V max all 1.50 31.8 -6.4 48.5 36.5 74.0 54.0 17.5 max all, noise
22 4339.2 HQR1TO18S01 H/V max all 1.50 32.1 -6.7 42.3 30.3 74.0 54.0 23.7 max all, noise
23
*Avg data computed from Peak Measured Data and EUT Duty Cycle. EUT in CW mode.

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Document Created: 2019-03-26 11:46:03
Document Modified: 2019-03-26 11:46:03

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