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  3. VSODX-4400

FCC ID VSODX-4400

VHF Transceiver

by YEONHWA M TECH CO.,LTD

Grantee Code: VSO   Product Code: DX4400
Latest application date: 2026-06-17

FCC ID Device Details

FCC IDVSODX-4400
Mirrorsfcc.id | gov | fccid.ai
Grantee CodeVSO
Product CodeDX4400
Applicant BusinessYEONHWA M TECH CO.,LTD 🇰🇷
Related Domains xradio.co.kr maxonamerica.com
Equipment ClassVHF Transceiver
Test FirmLTA Co.,Ltd

Operating Frequencies

Frequency RangeApplication PurposeFinal Action Date
406.1-470 MHzOriginal Equipment2026-06-17

Exhibits

DocumentTypeAvailableFile
Label InformationID Label/Location Info2026-06-17PDF 124.9 KB
SAR Test ReportRF Exposure Info2026-06-17PDF 5.7 MB
Test ReportTest Report2026-06-17PDF 3.6 MB
Attstn Stmts part2.911(d)(7)Attestation Statements2026-06-17PDF 218.7 KB
Attstn Stmts parts 2.911(d)(5)(i)&(ii)Attestation Statements2026-06-17PDF 253.2 KB
DOC Attestation LetterAttestation Statements2026-06-17PDF 134.2 KB
Extended Frequency Justification LetterAttestation Statements2026-06-17PDF 127.5 KB
FCC Declaration LetterAttestation Statements2026-06-17PDF 126 KB
Agent Authorization LetterCover Letter(s)2026-06-17PDF 120.9 KB
Confidentiality Request LetterCover Letter(s)2026-06-17PDF 122.6 KB
Declaration of Model Difference LetterCover Letter(s)2026-06-17PDF 122.3 KB
User Manual Metadata onlyUsers Manual2026-12-14PDF 978.8 KB
Internal Photos Metadata onlyInternal Photos2026-12-14PDF 851.5 KB
External Photos Metadata onlyExternal Photos2026-12-14PDF 1.9 MB
SAR Test Setup Photos Metadata onlyTest Setup Photos2026-12-14PDF 259.1 KB
Test Setup Photos Metadata onlyTest Setup Photos2026-12-14PDF 357.1 KB
Block Diagram Metadata onlyBlock DiagramPDF 215.9 KB
Schematics Metadata onlySchematicsPDF 923.7 KB
Operational Description Metadata onlyOperational DescriptionPDF 498 KB
Parts List Metadata onlyParts List/Tune Up InfoPDF 67.3 KB
Tune Up Procedure Metadata onlyParts List/Tune Up InfoPDF 123.9 KB

Application Information

Application IDSBV4kat32B4THL3MMBm1YQ==
Final Action Date2026-06-17
Application PurposeOriginal Equipment
Applicant FRN0017098799
ModelDX-4400
Frequency Range406.1-470 MHz
Equipment ClassTNF - Licensed Non-Broadcast Transmitter Held to Face
Device DescriptionVHF Transceiver
Responsible PartyHWAN-DAE KIM, hdkim@xradio.co.kr , 82-31-444-7270
Non-Technical ContactPaul Sutherland, Maxon America, Inc., psutherland@maxonamerica.com , 913-859-9515
Test FirmAhn Chulho, LTA Co.,Ltd, chahn@ltalab.com , 82-31-323-6008
TCB Emailcb@industrial-ia.com
TCB ScopeB2: General Mobile Radio And Broadcast Services equipment in the following 47 CFR Parts 22 (non-cellular) 73, 74, 90, 95, 97, & 101 (all below 3 GHz)
Short-Term ConfidentialityYes
Long-Term ConfidentialityYes
Modular EquipmentDoes not apply
Composite DeviceNo
Cognitive RadioNo
Authorization WaiverNo
Authorization Waiver ApprovedNo
Section 5301 CertificationYes
Related OET Knowledge DataBase InquiryNo

Applications

Application IDDatePurpose
SBV4kat32B4THL3MMBm1YQ==2026-06-17Original Equipment

Equipment Authorization

FrequencyOutputToleranceEmissionRulesGrant Notes
406.1-470 MHz1.02.5 PM11K0F3E90EF ES
406.1-470 MHz1.02.5 PM7K60FXD90EF ES
406.1-470 MHz1.02.5 PM7K60FXE90EF ES
406.1-470 MHz5.02.5 PM11K0F3E90EF ES
406.1-470 MHz5.02.5 PM7K60FXD90EF ES
406.1-470 MHz5.02.5 PM7K60FXE90EF ES

Grants

TCB Grant - Application SBV4kat32B4THL3MMBm1YQ==

TCB GRANT OF EQUIPMENT
AUTHORIZATION		 TCB
Certification
Issued Under the Authority of the
Federal Communications Commission
By:

  IIA Lab Services, LLC
13146 NW 86th Drive Suite 400
Alachua, FL 32615
Date of Grant: 06/17/2026

Application Dated: 06/17/2026
YEONHWA M TECH CO.,LTD
36, Jeonpa-ro 44beon-gil Manan-gu, Gyeonggi-do
Anyang-si,
South Korea
 
Attention: HWAN-DAE KIM ,

NOT TRANSFERABLE
EQUIPMENT AUTHORIZATION is hereby issued to the named GRANTEE, and is VALID ONLY for the equipment identified hereon for use under the Commission's Rules and Regulations listed below.
 
FCC IDENTIFIER:  VSODX-4400
Name of Grantee:  YEONHWA M TECH CO.,LTD
Equipment Class: Licensed Non-Broadcast Transmitter Held to Face
Notes: VHF Transceiver
Grant Notes  FCC Rule Parts Frequency
Range (MHZ) 		Output
Watts 		Frequency
Tolerance 		Emission
Designator
EF ES 90 406.1  -  470.0 1.0 2.5  PM 11K0F3E
EF ES 90 406.1  -  470.0 1.0 2.5  PM 7K60FXD
EF ES 90 406.1  -  470.0 1.0 2.5  PM 7K60FXE
EF ES 90 406.1  -  470.0 5.0 2.5  PM 11K0F3E
EF ES 90 406.1  -  470.0 5.0 2.5  PM 7K60FXD
EF ES 90 406.1  -  470.0 5.0 2.5  PM 7K60FXE

Output power listed is rated conducted power at the antenna port. The maximum conducted output power, as allowed by 47 CFR 90.205(s), is 6 W. Output power must not exceed that tested for SAR compliance. This transmitter may operate with the antennas tested for this filing in push-to-talk held-near-face and body-worn configurations. Body-worn SAR compliance is limited to the specific belt-clip and audio accessory configurations tested for this filing. This device must be restricted to work related operations in an Occupational/Controlled RF exposure Environment, not exceeding a maximum transmitting duty factor of 50 %. All qualified end-users of this device must have the knowledge to control their exposure conditions and/or duration to comply with Occupational/Controlled SAR limit and requirements. A label, as described in this filing, must be displayed on the device to direct users to specific training information for meeting Occupational Exposure Requirements, and users must be provided with the training information. The highest reported SAR values for FCC-authorized operations, accounting for a 50% duty factor, for head (face) and body exposure conditions are 2.77 W/kg and 3.38 W/kg, respectively.

EF: This device may contain functions that are not operational in U.S Territories except as noted in the filing. This grant has extended frequencies as noted in the filing and Section 2.927(b) applies to this authorization.
ES: This equipment is capable of supporting a minimum data rate of 4800 bits per second per 6.25 kHz of channel bandwidth.