| Callsign | KM4SDK |
| Radio Service | HA - Amateur |
| License Status | C - Canceled |
| Grant Date | 2016-03-10 |
| Effective Date | 2020-12-21 |
| Expire Date | 2026-03-10 |
| Cancel Date | 2021-02-27 |
| Last Action Date | 2021-02-27 |
| End Date | 2021-02-27 |
| Available Date | 2023-02-28 |
| Applicant Type | I - Individual |
| Entity Name | BARROS VILLAHERMOSA, CARLOS |
| Street Address / Locality | PO BOX 34561 FORT BUCHANAN, PR 00934 |
| County | Guaynabo Municipio |
| Zip Location | 18°24'40.7"N 66°07'27.2"W |
| Maidenhead | FK68wj |
| FRN | 0022501282 |
| Licensee ID/SGIN | L01771396 / 000 |
| Licensee Class | E - Amateur Extra |
| Callsign Group | D - 2x3 |
| ULS/Geo Region | 4 / 12 / PR |
| Prev Callsign / Prev Class | T - Technician |
| Next Callsign | W4DIA |
| Trustee Callsign / Trustee Name | |
| Vanity Type | |
| ULS File Number | 0009339367 |
| Phonetic weight / Morse weight | 12 / 66 |