Universal Licensing System
WRDM711
Chelmsford, Town of Police Dept
License details
| ULS identifier | 4167573 |
|---|
| Call sign | WRDM711 |
|---|
| Radio service | MW |
|---|
| Status | A |
|---|
| Grant date | 2019-06-05 |
|---|
| Expiration | 2029-06-05 |
|---|
| Frequency range | 19525 - 19620 MHz (3 frequencies) |
|---|
| Locations | 3 |
|---|
| Representative location | Chelmsford, MIDDLESEX, MA |
|---|
| Coordinates | 42.5986944, -71.3469722 |
|---|
| 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 | 19525.00000000 | | | | | |
| 1 | 1 | FXO | 19525.00000000 | | | | | |
| 1 | 1 | FXO | 19525.00000000 | | | | | |
| 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 | | | | | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 19525.00000000 | | 26M8D7W |
| 1 | 1 | 19525.00000000 | | 26M8D7W |
| 1 | 1 | 19525.00000000 | | 26M8D7W |
| 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 |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | 50 Billerica Road, Chelmsford, MIDDLESEX, MA | 42.59869444, -71.34697222 | 49.400 m | BTWR | 18.300 m structure / 24.400 m overall | |
| 2 | R | | 42.58500000, -71.36491667 | 125.000 m | | | |
| 3 | 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 | 224.1000 | | |
| 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 | | H | 38.6000 | 46.2000 | | |
| 2 | 3 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 3 | 1 | T | RADIO WAVES INC. HP2-18 | | V | 38.6000 | 46.2000 | | |
License history
| Date | File or call sign | Action |
|---|
| 2020-09-12 | WRDM711 | LIAUA |
| 2020-09-09 | WRDM711 | LETCNS |
| 2019-06-05 | WRDM711 | LIISS |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 4167573 | 2026-08-02 02:48:15 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WRDM711 | ULS 4167573 | 2026-08-02 02:48:15 |
| Status | A | ULS 4167573 | 2026-08-02 02:48:15 |
| Service | MW | ULS 4167573 | 2026-08-02 02:48:15 |
| Grant Date | 2019-06-05 | ULS 4167573 | 2026-08-02 02:48:15 |
| Expiration Date | 2029-06-05 | ULS 4167573 | 2026-08-02 02:48:15 |