MEDIATEK MT7921K BLE Combo Card Installation Guide

**MEDIATEK MT7921K BLE Combo Card Installation Guide

**

Document Revision History

System overview

General Description

MT7921K chip is highly integrated single chip which have built in 2×2 dual- band wireless LAN and Bluetooth combo radio. WiFi works on the ISM band, which means many other devicessuch as microwave oven, radar, and Bluetooth use the same frequencies and channels with WiFi devices.
Therefore, governments make regulations to avoid interference between devices. The specifications include usable channels, scan rule, and transmit power.

Driver install

How to install driver

Please follow the procedure listed in below to install driver

• 1st : Update Windows security package to register signature mechanism
• 2nd : Install Windows driver.

Windows Security for new signature mechanism

If you are the 1 st time to use this driver, you should update Windows Security for new signature mechanism at first. Please follow below link to install this software.
https://www.microsoft.com/en-us/download/details.aspx?id=46148
For windows 7 x64 example:

Windows 10 install note

Windows 10 install note

If manufacturer can’t install the driver in Windows 10 due to driver integrity check, try to disable the integrity check to allow installation.

Disable Driver Integrity Check

1. Open cmd as Administrator.
2. Execute ‘bcdedit /set nointegritychecks on’
3. Reboot
4. Then install again. If still fail, try do ‘Disable Secure Boot’ below.

NOTE: Re-enable the driver integrity check by executing ‘bcdedit /set nointegritychecks off’ and then rebooting.

Disable Secure Boot

Please refer to:
https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop /disabling-secure-boot

Install Windows driver

MT7921K supports PCIE interface. According to interface type of MT7921K, please refer to steps shown below to install Windows driver:

PCIE interface:

1. Connect DUT to PC/NB and check Windows Device Manager.

2. Window Device Manager would discover DUT shows “Generic Bluetooth Adapter”(BT device) and “WiFi_If”(WiFi device).

3. Right click the “Generic Bluetooth Adapter” BT device and select disable as follows.

4. Right-click on “WiFi_If” Wifi device and Update Driver Software.

5. According host’s Windows’ OS to select and install driver.
   
   
   

General Information & Integration Instructions

General Description of MT7921K

DSSS

64QAM, 16QAM, QPSK, BPSK for OFDM

256QAM for OFDM in 11ac mode and VHT20/40 in 2.4GHz 1024QAM for OFDMA in 11ax HE mode

Modulation Technology| BT EDR: FHSS

BT LE: GFSK

WLAN: DSSS, OFDM, OFDMA

Transfer Rate| BT EDR: up to 3 Mbps BT LE: up to 2 Mbps 802.11b: up to 11 Mbps 802.11a/g: up to 54 Mbps 802.11n: up to 300 Mbps

802.11ac: up to 866.7 Mbps 802.11ax: up to 1201.0 Mbps

Operating Frequency| BT EDR: 2402MHz ~ 2480MHz BT LE 1M: 2402MHz ~ 2480MHz BT LE 2M: 2404MHz ~ 2478MHz 2.4GHz: 2.412 ~ 2.472GHz

5GHz: 5.18~5.32GHz, 5.50~5.72GHz, 5.745 ~ 5.825GHz

6GHz: 5.955 ~ 6.415GHz, 6.435 ~ 6.525GHz, 6.525 ~ 6.875GHz, 6.875 ~ 7.115GHz

Number of Channel| BT EDR: 79

BT LE: 40

2.4GHz:

802.11b, 802.11g, 802.11n (HT20), VHT20, 802.11ax (HE20): 13

802.11n (HT40), VHT40, 802.11ax (HE40): 9

5GHz:

802.11a, 802.11n (HT20), 802.11ac (VHT20), 802.11ax (HE20): 25

802.11n (HT40), 802.11ac (VHT40), 802.11ax (HE40): 12

802.11ac (VHT80), 802.11ax (HE80): 6

6GHz:

802.11ax (HE20): 59

802.11ax (HE40): 29

802.11ax (HE80): 14

Antenna information

The antennas mentioned below are covered in the certification scope and the HOST can only be used with the following antennas:

Ant. Set

|

RF Chain No.

|

Brand

|

Model

| Ant. Net Gain (dBi)|

Freq. Range (GHz)

|

Ant. Type

|

Connector Type

| Cable Length (mm)|

Cable Loss (dB)

| Excluding Cable Loss Ant. Gain

(dBi)

---|---|---|---|---|---|---|---|---|---|---
 | Chain0| Cortec| AN2450-4902BRS| 2.42| 2.4~2.4835| Dipole| R-SMA| 150| 2.4~2.4835GHz : 0.5| 2.92
1| 3.87| 5.15~5.85| 5.15~5.85GHz : 0.8| 4.67
Chain1| Cortec| AN2450-4902BRS| 2.42| 2.4~2.4835| Dipole| R-SMA| 150| 2.4~2.4835GHz : 0.5| 2.92
 | 3.87| 5.15~5.85| 5.15~5.85GHz : 0.8| 4.67
 | Chain0| PSA| RFMTA340718EML| 3.18| 2.4~2.4835| PIFA| i-pex(MHF)| 200| included cable loss| –
2| B302| 4.92| 5.15~5.85
Chain1| PSA| RFMTA340718EML| 3.18| 2.4~2.4835| PIFA| ipex(MHF)| 200| included cable loss| –
 | B302| 4.92| 5.15~5.85

3

| Chain0| PSA| RFMTA311020EMM B301| 1.71

4.82

3.31

| 2.4~2.4835

5.15~5.85

5.92~7.125

|

PIFA

| ipex(MHF)| 200|

–

|

–

Chain1| PSA| RFMTA311020EMM B301| 1.71

4.82

3.31

| 2.4~2.4835

5.15~5.85

5.92~7.125

|

PIFA

|

ipex(MHF)

|

200

|

–

|

–

Please note that the above antennas are custom made for MediaTek MT7921K module and are not listed in Walsin Technology Corp standard catalogs. For the purchase of these antennas, please contact Walsin Technology as listed below directly. Only the above antennas are tested for compliance with the FCC rules, and all other antennas (even same type with lower gain) will require a re-assessment to be used with this module.

Contact info for above certified antennas:

Company/Dept.: Walsin Technology Corp./ Antenna Business Dept.
Contact window: Andrew Lin
Tel: +886-3-475-8711 # 8172
Cell phone: +886-938-286-596
Email address: andrewlin@passivecomponent.com
URL link: http://www.passivecomponent.com/zh-hant/products/antenna/Host Integration instructions

Host Integration instructions

HOST must follow the specific restrictions listed in “3.5 Regulatory notes” section below and section 3 of KDB996369D04 V02 Module Integration Guide v01, to verify that the host product meets all the applicable rules.

Regulatory notes

Federal Communication Commission Interference Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate this equipment.

This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

This device meets all the other requirements specified in Part 15E, Section 15.407 of the FCC Rules.

Radiation Exposure Statement:

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.

This module is intended for OEM integrators only. Per FCC KDB 996369 D03 OEM Manual v01 guidance, the following conditions must be strictly followed when using this certified module:

KDB 996369 D03 OEM Manual v01 rule sections:
List of applicable FCC rules
This module has been tested for compliance to FCC Part 15 Subpart C (15.247) and Subpart E (15.407). Device is tested for compliance as a low power indoor client device within 5.925–7.125 GHz band.

Summarize the specific operational use conditions
The module is tested for standalone mobile RF exposure use condition. Any other usage conditions such as co-location with other transmitter(s) will need a separate reassessment through a class II permissive change application or new certification. This module is authorized for Low Power Indoor Client applications only; final host product must be for indoor operations only.

Further operation restrictions on the host product include:
Prohibited for control of or Communications with unmanned aircraft systems.

Limited module procedures
Not applicable.

Trace antenna designs
Not applicable.

RF exposure considerations
This equipment complies with FCC mobile radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator & your body. A separate SAR/Power Density evaluation is required to confirm compliance with relevant FCC portable RF exposure rules.

Antennas

The following antennas have been certified for use with this module; antennas of the same type with equal or lower gain may also be used with this module except for operations within the 5.925~7.125GHz band. Use of any other antenna with a lower or higher gain in this band will require a separate reassessment through a Class II Permissive Change application or new certification.

Label and compliance information
The final end product must be labeled in a visible area with the following: “Contains FCC ID: RAS-MT7921K”. The grantee’s FCC ID can be used only when all FCC compliance requirements are met.

Information on test modes and additional testing requirements
This transmitter is tested in a standalone mobile RF exposure condition and any co-located or simultaneous transmission with other transmitter(s) class II permissive change re-evaluation or new certification.

Additional testing, Part 15 Subpart B disclaimer
This transmitter module is tested as a subsystem and its certification does not cover the FCC Part 15 Subpart B (unintentional radiator) rule requirement applicable to the final host. The final host will still need to be reassessed for compliance to this portion of rule requirements if applicable.

As long as all conditions above are met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed.

IMPORTANT NOTE: In the event that these conditions can not be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization is no longer considered valid and the FCC ID can not be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product (including the transmitter) and obtaining a separate FCC authorization.

Manual Information To the End User

The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user’s manual of the end product which integrates this module.

The end user manual shall include all required regulatory information/warning as show in this manual.

OEM/Host manufacturer responsibilities

OEM/Host manufacturers are ultimately responsible for the compliance of the Host and Module. The final product must be reassessed against all the essential requirements of the FCC rule such as FCC Part 15 Subpart B before it can be placed on the US market. This includes reassessing the transmitter module for compliance with the Radio and EMF essential requirements of the FCC rules. This module must not be incorporated into any other device or system without retesting for compliance as multi-radio and combined equipment.

References

• Disabling Secure Boot | Microsoft Learn
• Download Security Update for Windows 7 for x64-based Systems (KB3033929) from Official Microsoft Download Center

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