Universal Licensing System
WLB634
MCI WORLDCOM NETWORK SERVICES INC
License details
| ULS identifier | 987942 |
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| Call sign | WLB634 |
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| Radio service | CF |
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| Status | E |
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| Grant date | 1991-04-01 |
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| Expiration | 2001-02-01 |
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| Cancellation | 2001-05-06 |
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| Frequency range | 3730 - 4130 MHz (6 frequencies) |
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| Locations | 3 |
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| Representative location | BREA, ORANGE, CA |
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| Coordinates | 33.9450000, -117.8217222 |
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| Source archive | l_micro.zip |
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| Dataset refreshed | 2026-08-02 02:45:09 |
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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 |
|---|
| 1 | 1 | FXO | 3730.00000000 | | | | | |
| 1 | 2 | FXO | 3730.00000000 | | | | | |
| 1 | 1 | FXO | 3810.00000000 | | | | | |
| 1 | 2 | FXO | 3810.00000000 | | | | | |
| 1 | 1 | FXO | 3890.00000000 | | | | | |
| 1 | 2 | FXO | 3890.00000000 | | | | | |
| 1 | 1 | FXO | 3970.00000000 | | | | | |
| 1 | 2 | FXO | 3970.00000000 | | | | | |
| 1 | 1 | FXO | 4050.00000000 | | | | | |
| 1 | 2 | FXO | 4050.00000000 | | | | | |
| 1 | 1 | FXO | 4130.00000000 | | | | | |
| 1 | 2 | FXO | 4130.00000000 | | | | | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 3730.00000000 | | 20M0F7W |
| 1 | 2 | 3730.00000000 | | 20M0F7W |
| 1 | 1 | 3810.00000000 | | 20M0F7W |
| 1 | 2 | 3810.00000000 | | 20M0F7W |
| 1 | 1 | 3890.00000000 | | 20M0F7W |
| 1 | 2 | 3890.00000000 | | 20M0F7W |
| 1 | 1 | 3970.00000000 | | 20M0F7W |
| 1 | 2 | 3970.00000000 | | 20M0F7W |
| 1 | 1 | 4050.00000000 | | 20M0F7W |
| 1 | 2 | 4050.00000000 | | 20M0F7W |
| 1 | 1 | 4130.00000000 | | 20M0F7W |
| 1 | 2 | 4130.00000000 | | 20M0F7W |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | 1 MI N OF, BREA, ORANGE, CA | 33.94500000, -117.82172222 | 432.200 m | | 39.000 m overall | |
| 2 | R | | 34.09805556, -117.37863889 | 370.600 m | | | |
| 3 | R | | 33.86888889, -118.24838889 | 47.200 m | | | |
Antennas
| Location | Antenna | Type | Make / model | Height | Polarization | Gain dB | Azimuth | Radiation center | Maximum EIRP W |
|---|
| 1 | 1 | T | | | H | 39.8000 | 67.4000 | | |
| 1 | 2 | R | | | | 39.8000 | | | |
| 1 | 3 | R | | | | 39.8000 | | | |
| 2 | 1 | T | | | H | 39.8000 | 258.0000 | | |
License history
| Date | File or call sign | Action |
|---|
| 2001-05-06 | WLB634 | LIEXP |
| 2000-11-13 | WLB634 | LETRES |
| 1999-08-13 | WLB634 | LICCNV |
| 1999-02-11 | WLB634 | LITRAN |
| 1991-04-01 | WLB634 | LIREN |
| 1988-08-04 | WLB634 | LIMOD |
| 1986-10-23 | WLB634 | LIMOD |
| 1986-09-18 | WLB634 | LIMOD |
| 1985-09-26 | WLB634 | APGRT |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 987942 | 2026-08-02 02:45:09 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WLB634 | ULS 987942 | 2026-08-02 02:45:09 |
| Status | E | ULS 987942 | 2026-08-02 02:45:09 |
| Service | CF | ULS 987942 | 2026-08-02 02:45:09 |
| Grant Date | 1991-04-01 | ULS 987942 | 2026-08-02 02:45:09 |
| Expiration Date | 2001-02-01 | ULS 987942 | 2026-08-02 02:45:09 |
| Cancellation Date | 2001-05-06 | ULS 987942 | 2026-08-02 02:45:09 |