HEARING AID COMPATIBILITY T-COIL TEST REPORT

Report No.: HA2O2001B

Test Firm: Sporton International Inc. (Shenzhen)

General Information

Applicant Name	OnePlus Technology (Shenzhen) Co., Ltd.
Equipment Name	Mobile Phone
Brand Name	1+, ONEPLUS
Model Name	CPH2451
FCC ID	2ABZ2-AA516
HW	11
SW	OxygenOS 13.0
EUT Stage	Production Unit
Frequency Band	GSM850: 824 MHz ~ 849 MHz GSM1900: 1850 MHz ~ 1910 MHz WCDMA Band II: 1850 MHz ~ 1910 MHz WCDMA Band IV: 1710 MHz ~ 1755 MHz WCDMA Band V: 824 MHz ~ 849 MHz LTE Band 2: 1850 MHz ~ 1910 MHz LTE Band 4: 1710 MHz ~ 1755 MHz LTE Band 5: 824 MHz ~ 849 MHz LTE Band 7: 2500 MHz ~ 2570 MHz LTE Band 12: 699 MHz ~ 716 MHz LTE Band 13: 777 MHz ~ 787 MHz LTE Band 17: 704 MHz ~ 716 MHz LTE Band 25: 1850 MHz ~ 1915 MHz LTE Band 26: 814 MHz ~ 849 MHz LTE Band 30: 2305 MHz ~ 2315 MHz LTE Band 38: 2570 MHz ~ 2620 MHz LTE Band 41: 2496 MHz ~ 2690 MHz LTE Band 48: 3550 MHz ~ 3700 MHz LTE Band 66: 1710 MHz ~ 1780 MHz LTE Band 71: 663 MHz ~ 698 MHz 5G NR n2: 1850 MHz ~ 1910 MHz 5G NR n5: 824 MHz ~ 849 MHz 5G NR n7: 2500 MHz ~ 2570 MHz 5G NR n25: 1850 MHz ~ 1915 MHz 5G NR n30: 2305 MHz ~ 2315 MHz 5G NR n66: 1710 MHz ~ 1780 MHz 5G NR n71: 663 MHz ~ 698 MHz 5G NR n38: 2570 MHz ~ 2620 MHz 5G NR n41: 2496 MHz ~ 2690 MHz 5G NR n48: 3550 MHz ~ 3700 MHz 5G NR n77: 3450 MHz ~ 3550 MHz, 3700 MHz ~ 3980 MHz 5G NR n78: 3450 MHz ~ 3550 MHz, 3700 MHz ~ 3800 MHz WLAN 2.4GHz Band: 2412 MHz ~ 2462 MHz WLAN 5.2GHz Band: 5180 MHz ~ 5240 MHz WLAN 5.3GHz Band: 5260 MHz ~ 5320 MHz WLAN 5.5GHz Band: 5500 MHz ~ 5700 MHz WLAN 5.8GHz Band: 5745 MHz ~ 5825 MHz WLAN 6GHz U-NII-5: 5925 MHz ~ 6425 MHz WLAN 6GHz U-NII-6: 6425 MHz ~ 6525 MHz WLAN 6GHz U-NII-7: 6525 MHz ~ 6875 MHz WLAN 6GHz U-NII-8: 6875 MHz ~ 7125 MHz Bluetooth: 2402 MHz ~ 2480 MHz NFC: 13.56 MHz
Mode	GSM/GPRS/EGPRS/DTM RMC/AMR 12.2Kbps HSDPA HSUPA DC-HSDPA HSPA+(16QAM uplink is supported) LTE: QPSK, 16QAM, 64QAM, 256QAM 5G NR: CP-OFDM / DFT-s-OFDM, PI/2 BPSK, QPSK, 16QAM, 64QAM, 256QAM WLAN 2.4GHz 802.11b/g/n HT20/HT40 WLAN 2.4GHz 802.11ac VHT20/VHT40 WLAN 2.4GHz 802.11ax HE20/HE40 WLAN 2.4GHz 802.11be EHT20/EHT40 WLAN 5GHz 802.11a/n HT20/HT40 WLAN 5GHz 802.11ac VHT20/VHT40/VHT80/VHT160 WLAN 5GHz 802.11ax HE20/HE40/HE80/HE160 WLAN 5GHz 802.11be EHT20/EHT40/EHT80/EHT160 WLAN 6GHz 802.11a/ax HE20/HE40/HE80/HE160 WLAN 6GHz 802.11be EHT20/EHT40/EHT80/EHT160/EHT320 Bluetooth BR/EDR/LE NFC: ASK

Attestation of Test Results

The device is compliance with HAC limits specified in guidelines FCC 47CFR §20.19 and ANSI Standard ANSI C63.19.

This is partial report for CMRS voice T-Coil testing. VOIP test report will be separately submitted.

Air Interface	Band MHz	T-Rating	Frequency Response	Magnetic Intensity
GSM CMRS Voice	GSM850	T4	Pass	Pass
GSM CMRS Voice	GSM1900	T4	Pass	Pass
UMTS CMRS Voice	Band II	T4	Pass	Pass
	Band IV	T4	Pass	Pass
	Band V	T4	Pass	Pass
	Band 7	T4	Pass	Pass
	Band 12/17	T4	Pass	Pass
VoLTE	Band 13	T4	Pass	Pass
	Band 25/2	T4	Pass	Pass
	Band 26/5	T4	Pass	Pass
	Band 30	T4	Pass	Pass
	Band 66/4	T4	Pass	Pass
	Band 71	T4	Pass	Pass
	Band 41/38	T4	Pass	Pass
	Band 48	T4	Pass	Pass
	VoWiFi	2450	T4	Pass	Pass
		5200	T4	Pass	Pass
		5300	T4	Pass	Pass
		5500	T4	Pass	Pass
		5800	T4	Pass	Pass

Date Tested: 2022/11/20~2022/11/25

Testing Location

Sporton International Inc. (Shenzhen) is accredited to ISO/IEC 17025:2017 by American Association for Laboratory Accreditation with Certificate Number 5145.01.

Test Firm	Sporton International Inc. (Shenzhen)
Test Site Location	1/F, 2/F, Bldg 5, Shiling Industrial Zone, Xinwei Village, Xili, Nanshan, Shenzhen, 518055, People's Republic of China
TEL	+86-755-86379589
FAX	+86-755-86379595
Sporton Site No.	SAR01-SZ
FCC Designation No.	CN1256
FCC Test Firm Registration No.	421272

Applied Standards

FCC CFR47 Part 20.19
ANSI C63.19-2011
FCC KDB 285076 D01 HAC Guidance v06r02
FCC KDB 285076 D02 T-Coil testing v04
FCC KDB 285076 D03 HAC FAQ v01r06

Measurement standards for T-Coil

6.1 Frequency Response

The frequency response of the perpendicular component of the magnetic field, measured in 1/3 octave bands, shall follow the response curve specified in this sub-clause, over the frequency range 300 Hz to 3000 Hz. Figure 1.1 and Figure 1.2 provide the boundaries as a function of frequency. These response curves are for true field-strength measurements of the T-Coil signal. Thus, the 6 dB/octave probe response has been corrected from the raw readings.

Figure 1.1 Magnetic field frequency response for WDs with field strength≤-15dB at 1 KHz

Graph showing magnetic field frequency response boundaries. The Y-axis represents dB relative to value at 1 kHz, ranging from -20 dB to 20 dB. The X-axis represents Frequency (Hz), ranging from 100 Hz to 10000 Hz. Key response curves include -2 dB, +2 dB, 6 dB/Oct, -4 dB/Oct, and -6 dB/Oct. The note indicates the frequency response is between 300 Hz and 3000 Hz.

Figure 1.2 Magnetic field frequency response for WDs with a field that exceeds -15 dB(A/m) at 1 kHz

Graph showing magnetic field frequency response boundaries. The Y-axis represents dB relative to value at 1 kHz, ranging from -20 dB to 20 dB. The X-axis represents Frequency (Hz), ranging from 100 Hz to 10000 Hz. Key response curves include -2 dB, +2 dB, 6 dB/Oct, -4 dB/Oct, -7 dB/Oct, and -12 dB/Oct. The note indicates the frequency response is between 300 Hz and 3000 Hz.

6.2 T-Coil Signal Quality Categories

This section provides the signal quality requirement for the intended T-Coil signal from a WD. Only the RF immunity of the hearing aid is measured in T-Coil mode. It is assumed that a hearing aid can have no immunity to an interference signal in the audio band, which is the intended reception band for this mode. A device is assessed beginning by determining the category of the RF environment in the area of the T-Coil source. The RF measurements made for the T-Coil evaluation are used to assign the category T1 through T4. The limitation is given in Table 1. This establishes the RF environment presented by the WD to a hearing aid.

Table 1 T-Coil Signal Quality Categories
Category	Telephone parameters WD signal quality ((signal + noise) to noise ratio in dB)
Category T1	0 to 10 dB
Category T2	10 to 20 dB
Category T3	20 to 30 dB
Category T4	> 30 dB

6.3 Description of EUT Test Position

Figure 3 illustrates the references and reference plane that shall be used in a typical EUT emissions measurement. The principle of this section is applied to EUT with similar geometry. Please refer to Appendix C for the setup photographs.

The area is 5 cm by 5 cm.
The area is centered on the audio frequency output transducer of the EUT.
The area is in a reference plane, which is defined as the planar area that contains the highest point in the area of the phone that normally rests against the user's ear. It is parallel to the centerline of the receiver area of the phone and is defined by the points of the receiver-end of the EUT handset, which, in normal handset use, rest against the ear.
The measurement plane is parallel to, and 10 mm in front of, the reference plane.

Figure 3 A typical EUT reference and plane for T-Coil measurements

Diagram showing a typical mobile phone from the front and side. It illustrates the reference point, perpendicular measurement location (1), and transverse measurement location (2). The measurement plane is indicated as being 10 mm from the reference plane, and the receiver axis is shown on the side view.

T-Coil Test Procedure

Referenced to ANSI C63.19-2011, Section 7.4. This section describes the procedures used to measure the ABM (T-Coil) performance of the WD. In addition to measuring the absolute signal levels, the A-weighted magnitude of the unintended signal shall also be determined. To assure that the required signal quality is measured, the measurement of the intended signal and the measurement of the unintended signal must be made at the same location for each measurement position. In addition, the RF field strength at each measurement location must be at or below that required for the assigned category.

Measurements shall not include undesired properties from the WD's RF field; therefore, use of a coaxial connection to a base station simulator or non-radiating load, there might still be RF leakage from the WD, which can interfere with the desired measurement. Pre-measurement checks should be made to avoid this possibility. All measurements shall be performed with the WD operating on battery power with an appropriate normal speech audio signal input level given in ANSI C63.19-2011 Table 7.1. If the device display can be turned off during a phone call, then that may be done during the measurement as well.

Measurement shall be performed at two locations specified in ANSI C63.19-2011 A.3, with the correct probe orientation for a particular location, in a multistage sequence by first measuring the field intensity of the desired T-Coil signal the same location as the desired ABM or T-Coil signal (ABM1), and the ratio of desired to undesired magnetic components (ABM2) must be measured at the same location as the desired ABM or T-Coil signal (ABM1), and the ratio of desired to undesired ABM signals must be calculated. For the perpendicular field location, only the ABM1 frequency response shall be determined in a third measurement stage.

The following steps summarize the basic test flow for determining ABM1 and ABM2. These steps assume that a sine wave or narrowband 1/3 octave signal can be used for the measurement of ABM1.

a. A validation of the test setup and instrumentation may be performed using a TMFS or Helmholtz coil Measure the emissions and confirm that they are within the specified tolerance.
b. Position the WD in the test setup and connect the WD RF connector to a base station simulator or a non-radiating load. Confirm that equipment that requires calibration has been calibrated, and that the noise level meets the requirements given in ANSI C63.19-2011 clause 7.3.1.
c. The drive level to the WD is set such that the reference input level specified in ANSI C63.19-2011 Table 7.1 is input to the base station simulator (or manufacturer's test mode equivalent) in 1 kHz, 1/3 octave band. This drive level shall be used for the T-Coil signal test (ABM1) at f = 1 kHz. Either a sine wave at 1025 Hz or a voice-like signal, band-limited to the 1 kHz 1/3 octave, as defined in ANSI C63.19-2011 clause 7.4.2, shall be used for the reference audio signal. If interference is found at 1025 Hz an alternative nearby reference audio signal frequency may be used. The same drive level shall be used for the ABM1 frequency response measurements at each 1/3 octave band center frequency. The WD volume control may be set at any level up to maximum, provided that a signal at any frequency at maximum modulation would not result in clipping or signal overload.
d. Determine the magnetic measurement locations for the WD device (A.3), if not already specified by the manufacturer, as described in ANSI C63.19-2011 clause 7.4.4.1.1 and 7.4.4.2.
e. At each measurement location, measure and record the desired T-Coil magnetic signals (ABM1 at fi) as described in ANSI C63.19-2011 clause 7.4.4.2 in each individual ISO 266-1975 R10 standard 1/3 octave band. The desired audio band input frequency (fi) shall be centered in each 1/3 octave band maintaining the same drive level as determined in item c) and the reading taken for that band.
f. Equivalent methods of determining the frequency response may also be employed, such as fast Fourier transform (FFT) analysis using noise excitation or input-output comparison using simulated speech. The full-band integrated probe output, as specified in D.9, may be used, as long as the appropriate calibration curve is applied to the measured result, so as to yield an accurate measurement of the field magnitude. (The resulting measurement shall be an accurate measurement in dB A/m.)
g. All Measurements of the desired signal shall be shown to be of the desired signal and not of an undesired signal. This may be shown by turning the desired signal ON and OFF with the probe measuring the same location. If the scanning method is used the scans shall show that all measurement points selected for the ABM1 measurement meet the ambient and test system noise criteria in ANSI C63.19-2011 clause 7.3.1.
h. At the measurement location for each orientation, measure and record the undesired broadband audio magnetic signal (ABM2) as specified in ANSI C63.19-2011 clause 7.4.4.4 with no audio signal applied (or digital zero applied, if appropriate) using A-weighting and the half-band integrator. Calculate the ratio of the desired to undesired signal strength (i.e., signal quality).
i. Obtain the data from the postprocessor, SEMCAD, and determine the category that properly classifies the signal quality based on ANSI C63.19-2011 Table 8.5.

7.1 Test Flow Chart

Figure 2 T-Coil Signal Test flowchart illustrates the steps involved in the T-Coil testing process, including confirming calibration, configuring the test setup, establishing WD reference level, finding measurement locations, measuring signal strength and quality, measuring frequency response, and determining the signal quality category.

7.2 Test Setup Diagram for GSM/UMTS/VoLTE/VoWiFi

Figure 3.9 Test Setup for GSM / UMTS/VoLTE/VoWiFi

This diagram depicts the test setup for T-Coil measurements involving GSM, UMTS, VoLTE, and VoWiFi. It includes a PC connected via USB to an AMMI (Audio Magnetic Measuring Instrument). The AMMI is connected to a Base Station Simulator (e.g., CMU200 or CMW500) and an AMCC (Audio Magnetic Calibration Coil). The Device Under Test (WD) is placed near the AMCC, and a probe is used to measure the magnetic field. The setup allows for audio input and output, with connections for coil input and probe input.

General Note:

Applicable input audio levels are defined for GSM (-16dBm0), UMTS (-16dBm0), VoLTE (-16dBm0), and VoWiFi (-20dBm0) according to C63 and KDB 285076 D02v04.
For GSM/UMTS, the input level is set via a communication tester (CMU200) using "Decoder Cal" and "Codec Cal" with specific audio options.
CMU200 can output a 1kHz audio signal equivalent to 3.14dBm0 for "Decoder Cal." configuration, used to adjust AMMI gain.
VoLTE is based on the IP Multimedia Subsystem (IMS) network, delivering voice service as data flows within the LTE data bearer.
VoLTE and VoWiFi over IMS testing uses a callbox (CMW500) to establish IP calls and control speech input levels.
KDB 285076 D02 specifies requirements for VoLTE and VoWiFi T-Coil testing, including establishing IP calls, using an IMS/SIP/IP server, an analog audio adapter, and injecting test tones at the average speech level.
T-coil performance for 5G FR1 is assessed according to KDB 285076 D03 v01r06.

Input Level Definitions and Examples

This section provides details on defining and setting input levels for GSM/UMTS, VoLTE, and VoWiFi tests, including required gain factors and calculated gain settings.

Example input level for GSM/UMTS

Gain Value (linear)	20* log(gain) dB	AMCC Coil In Level (dBv RMS)	dBm0
10	20	-2.47	3.14
8.17	18.24	-19.85	-14.24
	-21.61	-16

Signal Type	Duration (s)	Peak to RMS (dB)	RMS (dB)	Required Gain Factor	Calculated Gain Setting
1kHz sine	3	0	1	8.17
48k_voice_1kHz	1	16.2	-12.7	4.33	35.36
48k_voice_300Hz ~ 3kHz	2	21.6	-18.6	8.48	69.25

Example input level for VoLTE

Gain Value dBm0	Full scal Voltage	dB	AMMI audio out dBv (RMS)	AMCC Coil Out (dBv (RMS)
3.14	1.5	40	0.51
100	5.43		2.8	2.95
8.48	-16	18.57

Signal Type	Duration (s)	Peak to RMS (dB)	RMS (dB)	Gain Factor	Gain Setting
1kHz sine	3	0	1	8.48
48k_voice_1kHz	1	16.2	-12.7	4.33	36.73
48k_voice_300-3000	2	21.6	-18.6	8.48	71.94

Example input level for VoWiFi

Gain Value dBm0	Full scal Voltage	dB	AMMI audio out dBv (RMS)	AMCC Coil Out (dBv (RMS)
3.14	1.5	40	0.51
100	5.46		2.83	2.98
5.33	-20	14.54

Signal Type	Duration (s)	Peak to RMS (dB)	RMS (dB)	Gain Factor	Gain Setting
1kHz sine	3	0	1	5.33
48k_voice_1kHz	1	16.2	-12.7	4.33	23.10
48k_voice_300-3000	2	21.6	-18.6	8.48	45.23

Test Equipment List

Manufacturer	Name of Equipment	Type/Model	Serial Number	Last Cal.	Due Date
SPEAG	Audio Magnetic 1D Field Probe	AM1DV3	3128	2022/7/19	2023/7/18
SPEAG	Data Acquisition Electronics	DAE4	1664	2022/5/30	2023/5/29
SPEAG	Audio Magnetic Calibration Coil	AMCC	1128	NCR	NCR
SPEAG	Audio Measuring Instrument	AMMI	1137	NCR	NCR
SPEAG	Test Arch Phantom	N/A	N/A	NCR	NCR
SPEAG	Phone Positioner	N/A	N/A	NCR	NCR
R&S	Base Station (Measure)	CMU200	108440	2021/12/28	2022/12/27
R&S	Base Station(Measure)	CMW500	157651	2021/12/29	2022/12/28
Anymetre	Thermo-Hygrometer	JR593	2015030904	2022/7/12	2023/7/11

Note: NCR: "No-Calibration Required"

T-Coil testing for CMRS Voice

9.1 GSM Tests Results

Codec Investigation

Codec	GSM Codec	Orientation	Band / Channel
	AMR NB FR	AMR WB FR	GSM EFR (FR V2)
ABM 1 (dBA/m)	5.78	5.34	6.1	Axial	GSM850 / 189
ABM 2 (dBA/m)	-43.12	-43.03	-43.22
Signal Quality (dB)	48.9	48.37	49.32
Freq. Response	PASS	PASS	PASS

Remark: According to codec investigation, the worst codec is AMR WB FR.

Air Interface Investigation

Plot No.	Air Interface	Mode	Channel	Probe Position	ABM1 (A/m)	ABM2 (A/m)	Signal Quality dB	T Rating	Ambient Noise dB (A/m)	Freq. Response Variation dB	Frequency Response
1	GSM850	Voice	189	Axial (Z)	5.34	-43.03	48.37	T4	-52.03	1.65	PASS
				Transversal (Y)	-10.52	-46.90	36.38	T4	-51.89
2	GSM1900	Voice	661	Axial (Z)	6.41	-43.32	49.73	T4	-51.60	1.01	PASS
				Transversal (Y)	-10.20	-49.76	39.56	T4	-51.58

9.2 UMTS Tests Results

Codec Investigation

Codec	UMTS AMR Codec	Orientation	Band / BW / Channel
	NB AMR 4.75Kbps	WB AMR 6.60Kbps	NB AMR 12.2Kbps	WB AMR 23.85Kbps
ABM 1 (dBA/m)	6.7	6.21	7.65	7.64	Axial	B5 / 4182
ABM 2 (dBA/m)	-47.48	-46.51	-48.09	-48.07
Signal Quality (dB)	54.18	52.72	55.74	55.71
Freq. Response	PASS	PASS	PASS	PASS

Remark: According to codec investigation, the worst codec is WB AMR 6.60Kbps

Air Interface Investigation

Plot No.	Air Interface	Mode	Channel	Probe Position	ABM1 (A/m)	ABM2 (A/m)	Signal Quality dB	T Rating	Ambient Noise dB (A/m)	Freq. Response Variation dB	Frequency Response
3	WCDMA V	Voice	4182	Axial (Z)	10.36	-45.00	55.36	T4	-52.33	1.65	PASS
				Transversal (Y)	1.02	-49.95	50.97	T4	-51.78
4	WCDMA IV	Voice	1413	Axial (Z)	10.33	-44.93	55.26	T4	-51.85	1.78	PASS
				Transversal (Y)	0.59	-51.71	52.30	T4	-51.66
5	WCDMA II	Voice	9400	Axial (Z)	7.72	-45.21	52.93	T4	-51.34	1.92	PASS
				Transversal (Y)	-1.28	-52.76	51.48	T4	-50.88

T-Coil testing for CMRS IP Voice

10.1 VoLTE Tests Results

Codec Investigation

LTE FDD

Codec	VOLTE AMR Codec				Orientation	Band / BW / Channel
	NB AMR 4.75Kbps	WB AMR 6.60Kbps	NB AMR 12.2Kbps	WB AMR 23.85Kbps
ABM 1 (dBA/m)	5.56	4.1	5.45	5.64	Axial	B25 / 20M / 26340
ABM 2 (dBA/m)	-49.55	-49.18	-49.4	-49.24
Signal Quality (dB)	55.11	53.28	54.85	54.88
Freq. Response	PASS	PASS	PASS	PASS

Codec	VOLTE EVS Codec						Orientation	Band / BW / Channel
	EVS SWB 9.6Kbps	EVS SWB 128Kbps	EVS WB 5.9Kbps	EVS WB 128Kbps	EVS NB 5.9Kbps	EVS NB 24.4Kbps
ABM 1 (dBA/m)	6.48	9.14	-0.23	9.52	0.89	6.5	Axial	B25 / 20M / 26340
ABM 2 (dBA/m)	-49.22	-46.59	-49.1	-46.22	-49.44	-49.15
Signal Quality (dB)	55.7	55.73	48.87	55.74	50.33	55.65
Freq. Response	PASS	PASS	PASS	PASS	PASS	PASS

Remark: According to codec investigation, the worst codec is EVS WB 5.9Kbps

LTE TDD

Codec	VOLTE AMR Codec				Orientation	Band / BW / Channel
	NB AMR 4.75Kbps	WB AMR 6.60Kbps	NB AMR 12.2Kbps	WB AMR 23.85Kbps
ABM 1 (dBA/m)	11.7	9.82	11.33	7.35	Axial	B41 / 20M / 40620
ABM 2 (dBA/m)	-45.66	-40.87	-39.95	-42.37
Signal Quality (dB)	57.36	50.69	51.28	49.72
Freq. Response	PASS	PASS	PASS	PASS

Codec	VOLTE EVS Codec						Orientation	Band / BW / Channel
	EVS SWB 9.6Kbps	EVS SWB 128Kbps	EVS WB 5.9Kbps	EVS WB 128Kbps	EVS NB 5.9Kbps	EVS NB 24.4Kbps
ABM 1 (dBA/m)	9.6	8.96	2.64	8.06	4.87	8.6	Axial	B41 / 20M / 40620
ABM 2 (dBA/m)	-41.28	-40.22	-42.73	-40.77	-38.28	-40.45
Signal Quality (dB)	50.88	49.18	45.37	48.83	43.15	49.05
Freq. Response	PASS	PASS	PASS	PASS	PASS	PASS

Remark: According to codec investigation, the worst codec is EVS NB 5.9Kbps

Air Interface Investigation

Plot No.	Air Interface	BW (MHz)	Modulation	RB Size	RB offset	Channel	UL-DL Configuration	ABM1 (A/m)	ABM2 (A/m)	Signal Quality dB	T Rating	Ambient Noise dB (A/m)	Freq. Response Variation dB	Frequency Response
6	LTE Band 7	20	QPSK	100	0	21100	Axial (Z)	8.16	-46.13	54.29	T4	-50.99	1.24	PASS
							Transversal (Y)	-4.15	-52.73	48.58	T4	-53.74
7	LTE Band 12	10	QPSK	50	0	23095	Axial (Z)	11.35	-48.91	60.26	T4	-53.72	1.03	PASS
							Transversal (Y)	1.78	-52.34	54.12	T4	-52.75
8	LTE Band 13	10	QPSK	50	0	23230	Axial (Z)	3.18	-45.63	48.81	T4	-51.42	0.18	PASS
							Transversal (Y)	-7.77	-51.43	43.66	T4	-50.69
9	LTE Band 25	20	QPSK	100	0	26340	Axial (Z)	1.15	-44.94	46.09	T4	-50.88	0.72	PASS
							Transversal (Y)	0.98	-49.36	50.34	T4	-50.28
10	LTE Band 26	15	QPSK	75	0	26865	Axial (Z)	11.48	-42.22	53.70	T4	-51.43	0.92	PASS
							Transversal (Y)	1.27	-50.41	51.68	T4	-50.95
11	LTE Band 30	10	QPSK	50	0	27710	Axial (Z)	7.78	-46.29	54.07	T4	-50.69	1.8	PASS
							Transversal (Y)	-2.47	-52.28	49.81	T4	-50.84
12	LTE Band 66	20	QPSK	100	0	132322	Axial (Z)	7.87	-46.44	54.31	T4	-50.80	1.63	PASS
							Transversal (Y)	-4.60	-53.16	48.56	T4	-50.71
13	LTE Band 71	20	QPSK	100	0	133297	Axial (Z)	6.98	-47.83	54.81	T4	-50.67	1.81	PASS
							Transversal (Y)	0.21	-51.30	51.51	T4	-50.71
14	LTE Band 41	20	QPSK	100	0	40620	Axial (Z)	4.87	-38.28	43.15	T4	-50.68	1	PASS
							Transversal (Y)	-2.91	-46.80	43.89	T4	-50.95
15	LTE Band 48	20	QPSK	100	0	55830	Axial (Z)	9.43	-44.96	54.39	T4	-51.42	0.21	PASS
							Transversal (Y)	-4.45	-47.96	43.51	T4	-51.04

Frequency Bands	Modulation	Bandwidth (MHz)	Data Rate	Channel	Probe Position	ABM1 (A/m)	ABM2 (A/m)	Signal Quality dB	Signal Quality -3 dB
WLAN 2.4GHz	802.11b	20	1M	6	Axial (Z)	2.02	-44.83	46.85
	802.11b	20	11M	6	Axial (Z)	0.49	-44.99	45.48
	802.11g	20	6M	6	Axial (Z)	2.04	-44.41	46.45
	802.11g	20	54M	6	Axial (Z)	1.78	-45.95	47.73
	802.11n-HT20	20	MCS0	6	Axial (Z)	4.17	-45.11	49.28
	802.11n-HT20	20	MCS7	6	Axial (Z)	2.71	-46.19	48.90
	802.11n-HT40	40	MCS0	6	Axial (Z)	-4.32	-46.67	42.35
	802.11n-HT40	40	MCS7	6	Axial (Z)	-6.06	-46.77	40.71
	802.11ac-VHT20	20	MCS0	6	Axial (Z)	5.41	-46.31	51.72
	802.11ac-VHT20	20	MCS8	6	Axial (Z)	5.21	-46.68	51.89
	802.11ac-VHT40	40	MCS0	6	Axial (Z)	5.63	-46.89	52.52
	802.11ac-VHT40	40	MCS8	6	Axial (Z)	5.66	-47.33	52.99
	802.11ax-HE20	20	MCS0	6	Axial (Z)	5.28	-47.56	52.84
	802.11ax-HE20	20	MCS11	6	Axial (Z)	-0.30	-48.42	48.12
	802.11ax-HE40	40	MCS0	6	Axial (Z)	3.47	-47.72	51.19
	802.11ax-HE40	40	MCS11	6	Axial (Z)	2.60	-47.24	49.84
	802.11be-EHT20	20	MCS0	6	Axial (Z)	5.28	-50.93	56.21	53.21
	802.11be-EHT20	20	MCS11	6	Axial (Z)	-0.30	-50.58	50.28	47.28
	802.11be-EHT40	40	MCS0	6	Axial (Z)	3.47	-47.43	50.90	47.90
	802.11be-EHT40	40	MCS11	6	Axial (Z)	2.60	-50.68	53.28	50.28
WLAN 5GHz	802.11a	20	6M	40	Axial (Z)	1.92	-46.87	48.79
	802.11a	20	54M	40	Axial (Z)	1.04	-47.64	48.68
	802.11n-HT20	20	MCS0	40	Axial (Z)	3.50	-45.86	49.36
	802.11n-HT20	20	MCS7	40	Axial (Z)	-1.59	-50.58	48.99
	802.11n-HT40	40	MCS0	38	Axial (Z)	2.55	-47.62	50.17
	802.11n-HT40	40	MCS7	38	Axial (Z)	2.32	-46.11	48.43
	802.11ac-VHT20	20	MCS0	40	Axial (Z)	4.97	-46.38	51.35
	802.11ac-VHT20	20	MCS8	40	Axial (Z)	4.76	-46.62	51.38
	802.11ac-VHT40	40	MCS0	38	Axial (Z)	4.91	-47.08	51.99
	802.11ac-VHT40	40	MCS8	38	Axial (Z)	4.76	-47.55	52.31
	802.11ac-VHT80	80	MCS0	42	Axial (Z)	-0.21	-49.09	48.88
	802.11ac-VHT80	80	MCS8	42	Axial (Z)	1.80	-47.45	49.25
	802.11ac-VHT160	160	MCS0	50	Axial (Z)	4.34	-45.08	49.42
	802.11ac-VHT160	160	MCS8	50	Axial (Z)	5.11	-44.78	49.89
	802.11ax-HE20	20	MCS0	40	Axial (Z)	1.74	-47.01	48.75
	802.11ax-HE20	20	MCS11	40	Axial (Z)	2.49	-46.18	48.67
	802.11ax-HE40	40	MCS0	38	Axial (Z)	4.83	-46.56	51.39
	802.11ax-HE40	40	MCS11	38	Axial (Z)	4.37	-49.62	53.99
	802.11ax-HE80	80	MCS0	42	Axial (Z)	2.88	-47.54	50.42
	802.11ax-HE80	80	MCS11	42	Axial (Z)	2.63	-49.01	51.64
802.11ax-HE160	160	MCS0	50	Axial (Z)	4.97	-44.44	49.41
802.11ax-HE160	160	MCS11	50	Axial (Z)	4.96	-44.68	49.64
802.11be-EHT20	20	MCS0	40	Axial (Z)	1.74	-50.29	52.03	49.03
802.11be-EHT20	20	MCS11	40	Axial (Z)	2.49	-51.99	54.48	51.48
802.11be-EHT40	40	MCS0	38	Axial (Z)	4.83	-50.74	55.57	52.57
802.11be-EHT40	40	MCS11	38	Axial (Z)	4.37	-50.86	55.23	52.23
802.11be-EHT80	80	MCS0	42	Axial (Z)	2.88	-50.96	53.84	50.84
802.11be-EHT80	80	MCS11	42	Axial (Z)	2.63	-50.88	53.51	50.51
802.11be-EHT160	160	MCS0	50	Axial (Z)	4.97	-50.93	55.90	52.90
802.11be-EHT160	160	MCS11	50	Axial (Z)	4.96	-48.42	53.38	50.38
16	WLAN2.4GHz	40	802.11n-HT40 MCS 7			6	Axial (Z)	-6.06	-46.77	40.71	T4	-53.34	1.12	Pass
							Transversal (Y)	-6.38	-48.82	42.44	T4	-53.35
17	WLAN5.2GHz	40	802.11n-HT40 MCS 7			38	Axial (Z)	2.32	-46.11	48.43	T4	-53.44	1.7	Pass
							Transversal (Y)	0.77	-48.67	49.44	T4	-53.46
18	WLAN5.3GHz	40	802.11n-HT40 MCS 7			54	Axial (Z)	2.89	-45.81	48.70	T4	-53.35	1.82	Pass
							Transversal (Y)	0.37	-49.07	49.44	T4	-53.34
19	WLAN5.5GHz	40	802.11n-HT40 MCS 7			110	Axial (Z)	3.73	-44.81	48.54	T4	-53.42	1.72	Pass
							Transversal (Y)	-0.15	-50.42	50.27	T4	-53.42
20	WLAN5.8GHz	40	802.11n-HT40 MCS 7			159	Axial (Z)	2.99	-46.05	49.04	T4	-53.38	1.79	Pass
							Transversal (Y)	0.30	-50.07	50.37	T4	-53.40

Remark:

Phone Condition: Mute on; Backlight off; Max Volume
The detail frequency response results please refer to appendix A.

Test Engineer: Hank Huang, Kevin Xu, David Dai, Bin He

10.2 VoWiFi Tests Results

Codec Investigation

Codec	VOWIFI AMR Codec				Orientation	Band / Channel
	NB AMR 4.75Kbps	WB AMR 6.60Kbps	NB AMR 12.2Kbps	WB AMR 23.85Kbps
ABM 1 (dBA/m)	2.69	1.4	3.21	2.02	Axial	2.4GHz WLAN / 6
ABM 2 (dBA/m)	-45.63	-45.88	-45.3	-44.83
Signal Quality (dB)	48.32	47.28	48.51	46.85
Freq. Response	PASS	PASS	PASS	PASS

Codec	VOWIFI EVS Codec						Orientation	Band / BW / Channel
	EVS SWB 9.6Kbps	EVS SWB 128Kbps	EVS WB 5.9Kbps	EVS WB 128Kbps	EVS NB 5.9Kbps	EVS NB 24.4Kbps
ABM 1 (dBA/m)	3.72	3.71	3.38	3.71	2.69	3.21	Axial	2.4GHz WLAN/6
ABM 2 (dBA/m)	-46.84	-46.81	-47.02	-46.81	-45.63	-45.3
Signal Quality (dB)	50.56	50.52	50.4	50.52	48.32	48.51
Freq. Response	PASS	PASS	PASS	PASS	PASS	PASS

Remark: According to codec investigation, the worst codec is WB AMR 23.85Kbps

Uncertainty Assessment

The evaluation of uncertainty by the statistical analysis of a series of observations is termed a Type A evaluation of uncertainty. The evaluation of uncertainty by means other than the statistical analysis of a series of observation is termed a Type B evaluation of uncertainty. Each component of uncertainty, however evaluated, is represented by an estimated standard deviation, termed standard uncertainty, which is determined by the positive square root of the estimated variance. The combined standard uncertainty of the measurement result represents the estimated standard deviation of the result. It is obtained by combining the individual standard uncertainties of both Type A and Type B evaluation using the usual “root-sum-squares" (RSS) methods of combining standard deviations by taking the positive square root of the estimated variances. Expanded uncertainty is a measure of uncertainty that defines an interval about the measurement result within which the measured value is confidently believed to lie. It is obtained by multiplying the combined standard uncertainty by a coverage factor. For purpose of this document, a coverage factor two is used, which corresponds to confidence interval of about 95 %. The DASY uncertainty Budget is showed in Table 8.2.

The judgment of conformity in the report is based on the measurement results excluding the measurement uncertainty.

Table 8.2 Uncertainty Budget of audio band magnetic measurement
Error Description	Uncertainty Value (±%)	Probability	Divisor	(Ci)		Standard Uncertainty (±%)
Error Description	Uncertainty Value (±%)	Probability	Divisor	ABM1	ABM2	ABM1	ABM2
Probe Sensitivity
Reference Level	3.0	N	1	1	1	3.0	3.0
AMCC Geometry	0.4	R	1.732	1	1	0.2	0.2
AMCC Current	1.0	R	1.732	1	1	0.6	0.6
Probe Positioning during Calibr.	0.1	R	1.732	1	1	0.1	0.1
Noise Contribution	0.7	R	1.732	0.014	1	0.0	0.4
Frequency Slope	5.9	R	1.732	0.1	1	0.3	3.4
Probe System
Repeatability / Drift	1.0	R	1.732	1	1	0.6	0.6
Linearity / Dynamic Range	0.6	R	1.732	1	1	0.3	0.3
Acoustic Noise	1.0	R	1.732	0.1	1	0.1	0.6
Probe Angle	2.3	R	1.732	1	1	1.3	1.3
Spectral Processing	0.9	R	1.732	1	1	0.5	0.5
Integration Time	0.6	N	1	5	1	0.6	3.0
Field Distribution	0.2	R	1.732	1	1	0.1	0.1
Test Signal
Ref. Signal Spectral Response	0.6	R	1.732	0	1	0.0	0.3
Positioning
Probe Positioning	1.9	R	1.732	1	1	1.1	1.1
Phantom Thickness	0.9	R	1.732	1	1	0.5	0.5
DUT Positioning	1.9	R	1.732	1	1	1.1	1.1
External Contributions
RF Interference	0.0	R	1.732	1	0.3	0.0	0.0
Test Signal Variation	2.0	R	1.732	1	1	1.2	1.2
Combined Std. Uncertainty				4.0%	6.1%
Coverage Factor for 95 %	K=2				K=2
Expanded STD Uncertainty	8.1%				12.2%

References

[1] ANSI C63.19-2011, “American National Standard for Methods of Measurement of Compatibility between Wireless Communications Devices and Hearing Aids”, 27 May 2011.
[2] FCC KDB 285076 D01v06r01, “Equipment Authorization Guidance for Hearing Aid Compatibility", September 19, 2022
[3] FCC KDB 285076 D02 v04, “Guidance for performing T-Coil tests for air interfaces supporting voice over IP (e.g., LTE and WiFi) to support CMRS based telephone services", Feb. 23, 2022
[4] FCC KDB 285076 D03v01r06, “Hearing aid compatibility frequently asked questions”, July 20, 2022
[5] SPEAG DASY System Handbook

------THE END------

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General Information

Attestation of Test Results

Testing Location

Applied Standards

Measurement standards for T-Coil

6.1 Frequency Response

Figure 1.1 Magnetic field frequency response for WDs with field strength≤-15dB at 1 KHz

Figure 1.2 Magnetic field frequency response for WDs with a field that exceeds -15 dB(A/m) at 1 kHz

6.2 T-Coil Signal Quality Categories

6.3 Description of EUT Test Position

T-Coil Test Procedure

7.1 Test Flow Chart

7.2 Test Setup Diagram for GSM/UMTS/VoLTE/VoWiFi

Input Level Definitions and Examples

Example input level for GSM/UMTS

Example input level for VoLTE

Example input level for VoWiFi

Test Equipment List

T-Coil testing for CMRS Voice

9.1 GSM Tests Results

Codec Investigation

Air Interface Investigation

9.2 UMTS Tests Results

Codec Investigation

Air Interface Investigation

T-Coil testing for CMRS IP Voice

10.1 VoLTE Tests Results

Codec Investigation

LTE FDD

LTE TDD

Air Interface Investigation

10.2 VoWiFi Tests Results

Codec Investigation

Uncertainty Assessment

References

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