Universal Licensing System
WRDM690
Chelmsford, Town of Police Dept.
License details
| ULS identifier | 4167532 |
|---|
| Call sign | WRDM690 |
|---|
| Radio service | MW |
|---|
| Status | A |
|---|
| Grant date | 2019-06-05 |
|---|
| Expiration | 2029-06-05 |
|---|
| Frequency range | 19460 MHz |
|---|
| Locations | 5 |
|---|
| Representative location | Chelmsford, MIDDLESEX, MA |
|---|
| Coordinates | 42.6202500, -71.3678333 |
|---|
| Source archive | l_micro.zip |
|---|
| Dataset refreshed | 2026-08-02 02:48:15 |
|---|
Frequency assignments
| Location | Antenna | Station class | Assigned MHz | Upper MHz | Carrier MHz | Output W | ERP W | Altitude |
|---|
| 1 | 1 | FXO | 19315.00000000 | | | | | |
| 1 | 1 | FXO | 19315.00000000 | | | | | |
| 1 | 1 | FXO | 19315.00000000 | | | | | |
| 1 | 5 | FXO | 19380.00000000 | | | | | |
| 1 | 5 | FXO | 19380.00000000 | | | | | |
| 1 | 5 | FXO | 19380.00000000 | | | | | |
| 1 | 5 | FXO | 19380.00000000 | | | | | |
| 1 | 5 | FXO | 19380.00000000 | | | | | |
| 1 | 5 | FXO | 19380.00000000 | | | | | |
| 1 | 5 | FXO | 19380.00000000 | | | | | |
| 1 | 5 | FXO | 19380.00000000 | | | | | |
| 1 | 5 | FXO | 19380.00000000 | | | | | |
| 1 | 6 | FXO | 19460.00000000 | | | | | |
| 1 | 6 | FXO | 19460.00000000 | | | | | |
| 1 | 6 | FXO | 19460.00000000 | | | | | |
| 1 | 6 | FXO | 19460.00000000 | | | | | |
| 1 | 6 | FXO | 19460.00000000 | | | | | |
| 1 | 6 | FXO | 19460.00000000 | | | | | |
| 1 | 6 | FXO | 19460.00000000 | | | | | |
| 1 | 6 | FXO | 19460.00000000 | | | | | |
| 1 | 6 | FXO | 19460.00000000 | | | | | |
| 1 | 2 | FXO | 19540.00000000 | | | | | |
| 1 | 2 | FXO | 19540.00000000 | | | | | |
| 1 | 2 | FXO | 19540.00000000 | | | | | |
| 1 | 2 | FXO | 19540.00000000 | | | | | |
| 1 | 2 | FXO | 19540.00000000 | | | | | |
| 1 | 2 | FXO | 19540.00000000 | | | | | |
| 1 | 2 | FXO | 19540.00000000 | | | | | |
| 1 | 2 | FXO | 19540.00000000 | | | | | |
| 1 | 2 | FXO | 19540.00000000 | | | | | |
| 1 | 3 | FXO | 19620.00000000 | | | | | |
| 1 | 3 | FXO | 19620.00000000 | | | | | |
| 1 | 3 | FXO | 19620.00000000 | | | | | |
| 1 | 3 | FXO | 19620.00000000 | | | | | |
| 1 | 3 | FXO | 19620.00000000 | | | | | |
| 1 | 3 | FXO | 19620.00000000 | | | | | |
| 1 | 3 | FXO | 19620.00000000 | | | | | |
| 1 | 3 | FXO | 19620.00000000 | | | | | |
| 1 | 3 | FXO | 19620.00000000 | | | | | |
| 1 | 4 | FXO | 19675.00000000 | | | | | |
| 1 | 4 | FXO | 19675.00000000 | | | | | |
| 1 | 4 | FXO | 19675.00000000 | | | | | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 19315.00000000 | | 28M4D7W |
| 1 | 1 | 19315.00000000 | | 28M4D7W |
| 1 | 1 | 19315.00000000 | | 28M4D7W |
| 1 | 5 | 19380.00000000 | | 64M5D7W |
| 1 | 5 | 19380.00000000 | | 64M5D7W |
| 1 | 5 | 19380.00000000 | | 64M5D7W |
| 1 | 5 | 19380.00000000 | | 64M5D7W |
| 1 | 5 | 19380.00000000 | | 64M5D7W |
| 1 | 5 | 19380.00000000 | | 64M5D7W |
| 1 | 5 | 19380.00000000 | | 64M5D7W |
| 1 | 5 | 19380.00000000 | | 64M5D7W |
| 1 | 5 | 19380.00000000 | | 64M5D7W |
| 1 | 6 | 19460.00000000 | | 64M5D7W |
| 1 | 6 | 19460.00000000 | | 64M5D7W |
| 1 | 6 | 19460.00000000 | | 64M5D7W |
| 1 | 6 | 19460.00000000 | | 64M5D7W |
| 1 | 6 | 19460.00000000 | | 64M5D7W |
| 1 | 6 | 19460.00000000 | | 64M5D7W |
| 1 | 6 | 19460.00000000 | | 64M5D7W |
| 1 | 6 | 19460.00000000 | | 64M5D7W |
| 1 | 6 | 19460.00000000 | | 64M5D7W |
| 1 | 2 | 19540.00000000 | | 64M5D7W |
| 1 | 2 | 19540.00000000 | | 64M5D7W |
| 1 | 2 | 19540.00000000 | | 64M5D7W |
| 1 | 2 | 19540.00000000 | | 64M5D7W |
| 1 | 2 | 19540.00000000 | | 64M5D7W |
| 1 | 2 | 19540.00000000 | | 64M5D7W |
| 1 | 2 | 19540.00000000 | | 64M5D7W |
| 1 | 2 | 19540.00000000 | | 64M5D7W |
| 1 | 2 | 19540.00000000 | | 64M5D7W |
| 1 | 3 | 19620.00000000 | | 64M5D7W |
| 1 | 3 | 19620.00000000 | | 64M5D7W |
| 1 | 3 | 19620.00000000 | | 64M5D7W |
| 1 | 3 | 19620.00000000 | | 64M5D7W |
| 1 | 3 | 19620.00000000 | | 64M5D7W |
| 1 | 3 | 19620.00000000 | | 64M5D7W |
| 1 | 3 | 19620.00000000 | | 64M5D7W |
| 1 | 3 | 19620.00000000 | | 64M5D7W |
| 1 | 3 | 19620.00000000 | | 64M5D7W |
| 1 | 4 | 19675.00000000 | | 26M8D7W |
| 1 | 4 | 19675.00000000 | | 26M8D7W |
| 1 | 4 | 19675.00000000 | | 26M8D7W |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | 2 Olde North Rd, Chelmsford, MIDDLESEX, MA | 42.62025000, -71.36783333 | 48.500 m | LTOWER | 25.900 m structure / 27.400 m overall | |
| 2 | R | | 42.63813889, -71.39713889 | 48.500 m | | | |
| 3 | R | | 42.61722222, -71.36530556 | 51.200 m | | | |
| 4 | R | | 42.63152778, -71.41061111 | 54.600 m | | | |
| 5 | R | | 42.61413889, -71.32513889 | 53.300 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 | 309.6000 | | |
| 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 | | | |
| 1 | 5 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 2 | 1 | T | RADIO WAVES INC. HP2-18 | | V | 38.6000 | 148.3000 | | |
| 2 | 3 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 2 | 5 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 3 | 1 | T | RADIO WAVES INC. HP2-18 | | H | 38.6000 | 148.3000 | | |
| 4 | 1 | T | RADIO WAVES INC. HP2-18 | | V | 38.6000 | 289.7000 | | |
| 5 | 1 | T | RADIO WAVES INC. HP2-18 | | H | 38.6000 | 101.0000 | | |
| 6 | 1 | T | RADIO WAVES INC. HP2-18 | | V | 38.6000 | 101.0000 | | |
License history
| Date | File or call sign | Action |
|---|
| 2020-09-12 | WRDM690 | LIAUA |
| 2020-09-09 | WRDM690 | LETCNS |
| 2019-06-05 | WRDM690 | LIISS |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 4167532 | 2026-08-02 02:48:15 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WRDM690 | ULS 4167532 | 2026-08-02 02:48:15 |
| Status | A | ULS 4167532 | 2026-08-02 02:48:15 |
| Service | MW | ULS 4167532 | 2026-08-02 02:48:15 |
| Grant Date | 2019-06-05 | ULS 4167532 | 2026-08-02 02:48:15 |
| Expiration Date | 2029-06-05 | ULS 4167532 | 2026-08-02 02:48:15 |