FCC ID: A3LRF4421D-D1A RRU(RF4421d)

CTK Co., Ltd.

(Ho-dong), 113, Yejik-ro, Cheoin-gu, Yongin-si, Gyeonggi-do, 449-100, Korea Tel: +82-31-339-9970 Fax: +82-31-624-9501 www.e-ctk.com Label Photographs

19 Chapin Rd., Building, Pine Brook, New Jersey, United States, 07058 To whom it may it concern:

I hereby appoint KIM, Jong-in to sign letters and applications for any filings with regulatory agencies on our behalf, and to receive and exchange data between our company, the agents company and the agency in connection with certification for any products that our company owns or manufactures. Sincerely,. NAME: Jenni Chun TITLE: General Manager, Regulatory & Environmental Affairs Applicant: Samsung Electronics America, Inc Address: 19 Chapin Rd, Building D. Pine Brook, NJ 07058

129, Samsung-ro Yeongtong-gu, Suwon-si, Gyeonggi-do, Korea, 16677 Tel No : +82-31-279-3096 Federal Communications Commission Authorization and Evaluation Division 1435 Oakland Mills Road Columbia, MD 21046 Date: July 13, 2020 SUBJECT: FCC Application for (FCC ID : A3LRF4421D-D1A) To Whom it may concern:

This is to request a Class II permissive change to our product(FCC ID : A3LRF4421D-D1A), the device is identical to the previously certified except for the changes as below for details;

1) Add the frequency bandwidth :

Operating band Carrier Bandwidth(MHz) Band 25 Band 66 5+10 5+15 10+10 10+15 Multi carrier(2C) Multi carrier(3C) Multi carrier(2C) Multi carrier(3C) 5+5 10+20 5+5+5 5+5 10+20 5+5+5 5+5+15 5+5+20 5+10+10 5+10+15 5+10+20 10+10+10 10+10+15 10+10+20 5+10 5+15 5+20 10+15

5+5+10 5+5+15 5+5+20 5+10+15 5+10+20 10+10+10 10+10+15

This authorization is valid until further written notice from the applicant. Please contact me if you have any questions or need future information regarding this application. Regards, Kim, Jong-in / General Manager Samsung Electronics Co Ltd

19 Chapin Rd., Building, Pine Brook, New Jersey, United States, 07058 Federal Communications Commission Authorization and Evaluation Division 1435 Oakland Mills Road Columbia, MD 21046 Date: July 13, 2020 SUBJECT: FCC Application for (FCC ID : A3LRF4421D-D1A) To Whom it may concern:

We, the undersigned, hereby authorize Bong-jun, Jang at CTK on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by CTK on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards, Kim, Jong-in / General Manager Samsung Electronics Co Ltd

19 Chapin Rd., Building, Pine Brook, New Jersey, United States, 07058 File Name

(RF4421d-D1A)_Block diagram.pdf

(RF4421d-D1A)_Schematics.pdf

(RF4421d-D1A)_Partlist.pdf

(RF4421d-D1A)_Operation description.pdf

(RF4421d-D1A)_Tune-up procedure.pdf

(RF4421d-D1A)_User manual

(RF4421d-D1A)_Internal Photos.pdf Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: A3LRF4421D-D1A Pursuant to Sections 0.457 and 0.459 of the Commissions Rules, we hereby request confidential treatment of information accompanying this application as outlined below:

Exhibit Type Block Diagram Schematics Parts List Operational description Tune-up Procedure User Manual Internal Photos The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. We understand that the documentation for internal photographs and manuals has been made publicly available on various websites. Sincerely, Kim, Jong-in / Staff Engineer Samsung Electronics Co Ltd

19 Chapin Rd., Building, Pine Brook, New Jersey, United States, 07058 Federal Communications Commission Authorization and Evaluation Division 1435 Oakland Mills Road Columbia, MD 21046 Date: May 13, 2020 SUBJECT: FCC Application for (FCC ID : A3LRF4421D-D1A) To Whom it may concern:

We, the undersigned, hereby authorize Bong-jun, Jang at CTK on our behalf, to apply to the Federal Communications Commission on our equipment. Any and all acts carried out by CTK on our behalf shall have the same effect as acts of our own. This is to advise that we are in full compliance with the Anti- Drug Abuse Act. We, the applicant, are not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 USC853a, and no party to the application is subject to a denial of federal benefits pursuant to that section. Regards, Kim, Jong-in / Staff Engineer Samsung Electronics Co Ltd