Universal Licensing System
WRDL804
Chelmsford, Town of Police Dept
License details
| ULS identifier | 4165448 |
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| Call sign | WRDL804 |
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| Radio service | MW |
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| Status | A |
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| Grant date | 2019-05-30 |
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| Expiration | 2029-05-30 |
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| Frequency range | 17755 - 17845 MHz (2 frequencies) |
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| Locations | 3 |
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| Representative location | Chelmsford, MIDDLESEX, MA |
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| Coordinates | 42.6381389, -71.3971389 |
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| Source archive | l_micro.zip |
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| Dataset refreshed | 2026-08-02 02:48:15 |
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Frequency assignments
| Location | Antenna | Station class | Assigned MHz | Upper MHz | Carrier MHz | Output W | ERP W | Altitude |
|---|
| 1 | 1 | FXO | 17755.00000000 | | | | | |
| 1 | 1 | FXO | 17755.00000000 | | | | | |
| 1 | 1 | FXO | 17755.00000000 | | | | | |
| 1 | 2 | FXO | 17845.00000000 | | | | | |
| 1 | 2 | FXO | 17845.00000000 | | | | | |
| 1 | 2 | FXO | 17845.00000000 | | | | | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 17755.00000000 | | 28M4D7W |
| 1 | 1 | 17755.00000000 | | 28M4D7W |
| 1 | 1 | 17755.00000000 | | 28M4D7W |
| 1 | 2 | 17845.00000000 | | 28M4D7W |
| 1 | 2 | 17845.00000000 | | 28M4D7W |
| 1 | 2 | 17845.00000000 | | 28M4D7W |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | Doris Drive, Chelmsford, MIDDLESEX, MA | 42.63813889, -71.39713889 | 48.500 m | TANK | 41.100 m structure / 44.200 m overall | |
| 2 | R | | 42.62025000, -71.36783333 | 48.500 m | | | |
| 3 | R | | 42.60583333, -71.37650000 | 106.100 m | | | |
Antennas
| Location | Antenna | Type | Make / model | Height | Polarization | Gain dB | Azimuth | Radiation center | Maximum EIRP W |
|---|
| 1 | 1 | T | RADIO WAVES INC. HP2-18 | | V | 38.6000 | 129.6000 | | |
| 1 | 2 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 1 | 3 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 2 | 1 | T | RADIO WAVES INC. HP2-18 | | V | 38.6000 | 154.7000 | | |
License history
| Date | File or call sign | Action |
|---|
| 2020-09-12 | WRDL804 | LIAUA |
| 2020-09-01 | WRDL804 | LETCNS |
| 2019-05-30 | WRDL804 | LIISS |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 4165448 | 2026-08-02 02:48:15 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WRDL804 | ULS 4165448 | 2026-08-02 02:48:15 |
| Status | A | ULS 4165448 | 2026-08-02 02:48:15 |
| Service | MW | ULS 4165448 | 2026-08-02 02:48:15 |
| Grant Date | 2019-05-30 | ULS 4165448 | 2026-08-02 02:48:15 |
| Expiration Date | 2029-05-30 | ULS 4165448 | 2026-08-02 02:48:15 |