Universal Licensing System
WMI257
MCI WORLDCOM NETWORK SERVICES INC
License details
| ULS identifier | 1001567 |
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| Call sign | WMI257 |
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| Radio service | CF |
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| Status | C |
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| Grant date | 1992-01-21 |
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| Expiration | 2001-02-01 |
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| Cancellation | 1999-04-01 |
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| Frequency range | 21275 MHz |
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| Locations | 2 |
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| Representative location | ALTADENA, LOS ANGELES, CA |
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| Coordinates | 34.2266667, -118.0664444 |
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| Source archive | l_micro.zip |
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| Dataset refreshed | 2026-09-14 16:58:41 |
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Licensee
| Name | MCI WORLDCOM NETWORK SERVICES INC |
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| Applicant type | C |
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| Location | RICHARDSON, TX |
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| Address | 2270 LAKESIDE DR, RICHARDSON, TX, 75082 |
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Frequency assignments
| Location | Antenna | Station class | Assigned MHz | Upper MHz | Carrier MHz | Output W | ERP W | Altitude |
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| 1 | 1 | FXO | 21275.00000000 | | | | | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
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| 1 | 1 | 21275.00000000 | | 25M0F8W |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
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| 1 | T | 3.5 MI NE OF, ALTADENA, LOS ANGELES, CA | 34.22666667, -118.06644444 | 1741.300 m | | 144.200 m overall | |
| 2 | R | | 34.22666667, -118.06672222 | 1741.300 m | | | |
Antennas
| Location | Antenna | Type | Make / model | Height | Polarization | Gain dB | Azimuth | Radiation center | Maximum EIRP W |
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| 1 | 1 | T | | | H | | 263.1000 | | |
| 1 | 2 | R | | | | | | | |
License history
| Date | File or call sign | Action |
|---|
| 1999-08-14 | WMI257 | LICCNV |
| 1999-04-01 | WMI257 | LICAN |
| 1999-04-01 | WMI257 | LIISS |
Sources and provenance
| Source | Source record | Retrieved | Match |
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| ULS | 1001567 | 2026-08-31 20:51:05 | Source Primary |
Selected field provenance
| Field | Displayed value | Source | Observed |
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| Applicant Name | MCI WORLDCOM NETWORK SERVICES INC | ULS 1001567 | 2026-08-31 20:58:56 |
| Call Sign | WMI257 | ULS 1001567 | 2026-08-31 20:58:56 |
| Cancellation Date | 1999-04-01 | ULS 1001567 | 2026-08-31 20:58:56 |
| Description | 9203049 | ULS 1001567 | 2026-08-31 20:58:56 |
| Expiration Date | 2001-02-01 | ULS 1001567 | 2026-08-31 20:58:56 |
| Filed Date | 1992-01-21 | ULS 1001567 | 2026-08-31 20:58:56 |
| Grant Date | 1992-01-21 | ULS 1001567 | 2026-08-31 20:58:56 |
| Service | CF | ULS 1001567 | 2026-08-31 20:58:56 |
| Source Archive | l_micro.zip | ULS 1001567 | 2026-08-31 20:58:56 |
| Status | C | ULS 1001567 | 2026-08-31 20:58:56 |