Universal Licensing System
WRDM697
Chelmsford, Town of Police Dept
License details
| ULS identifier | 4167540 |
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| Call sign | WRDM697 |
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| Radio service | MW |
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| Status | A |
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| Grant date | 2019-06-05 |
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| Expiration | 2029-06-05 |
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| Frequency range | 19405 - 19585 MHz (3 frequencies) |
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| Locations | 4 |
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| Representative location | Chelmsford, MIDDLESEX, MA |
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| Coordinates | 42.6058333, -71.3765000 |
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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 | 19405.00000000 | | | | | |
| 1 | 1 | FXO | 19405.00000000 | | | | | |
| 1 | 1 | FXO | 19405.00000000 | | | | | |
| 1 | 3 | FXO | 19435.00000000 | | | | | |
| 1 | 3 | FXO | 19435.00000000 | | | | | |
| 1 | 3 | FXO | 19435.00000000 | | | | | |
| 1 | 2 | FXO | 19585.00000000 | | | | | |
| 1 | 2 | FXO | 19585.00000000 | | | | | |
| 1 | 2 | FXO | 19585.00000000 | | | | | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 19405.00000000 | | 28M4D7W |
| 1 | 1 | 19405.00000000 | | 28M4D7W |
| 1 | 1 | 19405.00000000 | | 28M4D7W |
| 1 | 3 | 19435.00000000 | | 26M8D7W |
| 1 | 3 | 19435.00000000 | | 26M8D7W |
| 1 | 3 | 19435.00000000 | | 26M8D7W |
| 1 | 2 | 19585.00000000 | | 26M8D7W |
| 1 | 2 | 19585.00000000 | | 26M8D7W |
| 1 | 2 | 19585.00000000 | | 26M8D7W |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | Locke Road, Chelmsford, MIDDLESEX, MA | 42.60583333, -71.37650000 | 106.100 m | TANK | 24.400 m structure / 25.900 m overall | |
| 2 | R | | 42.63813889, -71.39713889 | 48.500 m | | | |
| 3 | R | | 42.63152778, -71.41061111 | 54.600 m | | | |
| 4 | R | | 42.58500000, -71.36491667 | 125.000 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 | 334.7000 | | |
| 1 | 2 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 1 | 3 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 1 | 4 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 2 | 1 | T | RADIO WAVES INC. HP2-18 | | V | 38.6000 | 315.6000 | | |
| 3 | 1 | T | RADIO WAVES INC. HP2-18 | | V | 38.6000 | 157.7000 | | |
License history
| Date | File or call sign | Action |
|---|
| 2020-09-12 | WRDM697 | LIAUA |
| 2020-09-09 | WRDM697 | LETCNS |
| 2019-06-05 | WRDM697 | LIISS |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 4167540 | 2026-08-02 02:48:15 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WRDM697 | ULS 4167540 | 2026-08-02 02:48:15 |
| Status | A | ULS 4167540 | 2026-08-02 02:48:15 |
| Service | MW | ULS 4167540 | 2026-08-02 02:48:15 |
| Grant Date | 2019-06-05 | ULS 4167540 | 2026-08-02 02:48:15 |
| Expiration Date | 2029-06-05 | ULS 4167540 | 2026-08-02 02:48:15 |