Universal Licensing System
WRDM704
Chelmsford, Town of Police Dept.
License details
| ULS identifier | 4167565 |
|---|
| Call sign | WRDM704 |
|---|
| Radio service | MW |
|---|
| Status | A |
|---|
| Grant date | 2019-06-05 |
|---|
| Expiration | 2029-06-05 |
|---|
| Frequency range | 17980 - 18060 MHz (2 frequencies) |
|---|
| Locations | 2 |
|---|
| Representative location | Chelmsford, MIDDLESEX, MA |
|---|
| Coordinates | 42.6172222, -71.3653056 |
|---|
| Source archive | l_micro.zip |
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| 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 | 17980.00000000 | | | | | |
| 1 | 1 | FXO | 17980.00000000 | | | | | |
| 1 | 1 | FXO | 17980.00000000 | | | | | |
| 1 | 1 | FXO | 17980.00000000 | | | | | |
| 1 | 1 | FXO | 17980.00000000 | | | | | |
| 1 | 1 | FXO | 17980.00000000 | | | | | |
| 1 | 1 | FXO | 17980.00000000 | | | | | |
| 1 | 1 | FXO | 17980.00000000 | | | | | |
| 1 | 1 | FXO | 17980.00000000 | | | | | |
| 1 | 2 | FXO | 18060.00000000 | | | | | |
| 1 | 2 | FXO | 18060.00000000 | | | | | |
| 1 | 2 | FXO | 18060.00000000 | | | | | |
| 1 | 2 | FXO | 18060.00000000 | | | | | |
| 1 | 2 | FXO | 18060.00000000 | | | | | |
| 1 | 2 | FXO | 18060.00000000 | | | | | |
| 1 | 2 | FXO | 18060.00000000 | | | | | |
| 1 | 2 | FXO | 18060.00000000 | | | | | |
| 1 | 2 | FXO | 18060.00000000 | | | | | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 17980.00000000 | | 64M5D7W |
| 1 | 1 | 17980.00000000 | | 64M5D7W |
| 1 | 1 | 17980.00000000 | | 64M5D7W |
| 1 | 1 | 17980.00000000 | | 64M5D7W |
| 1 | 1 | 17980.00000000 | | 64M5D7W |
| 1 | 1 | 17980.00000000 | | 64M5D7W |
| 1 | 1 | 17980.00000000 | | 64M5D7W |
| 1 | 1 | 17980.00000000 | | 64M5D7W |
| 1 | 1 | 17980.00000000 | | 64M5D7W |
| 1 | 2 | 18060.00000000 | | 64M5D7W |
| 1 | 2 | 18060.00000000 | | 64M5D7W |
| 1 | 2 | 18060.00000000 | | 64M5D7W |
| 1 | 2 | 18060.00000000 | | 64M5D7W |
| 1 | 2 | 18060.00000000 | | 64M5D7W |
| 1 | 2 | 18060.00000000 | | 64M5D7W |
| 1 | 2 | 18060.00000000 | | 64M5D7W |
| 1 | 2 | 18060.00000000 | | 64M5D7W |
| 1 | 2 | 18060.00000000 | | 64M5D7W |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | 230 North Road, Chelmsford, MIDDLESEX, MA | 42.61722222, -71.36530556 | 51.200 m | GTOWER | 24.400 m structure / 26.800 m overall | |
| 2 | R | | 42.62025000, -71.36783333 | 48.500 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 | 328.3000 | | |
| 1 | 2 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
| 2 | 1 | T | RADIO WAVES INC. HP2-18 | | H | 38.6000 | 328.3000 | | |
| 2 | 2 | R | RADIO WAVES INC. HP2-18 | | | 38.6000 | | | |
License history
| Date | File or call sign | Action |
|---|
| 2020-09-12 | WRDM704 | LIAUA |
| 2020-09-09 | WRDM704 | LETCNS |
| 2019-06-05 | WRDM704 | LIISS |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 4167565 | 2026-08-02 02:48:15 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WRDM704 | ULS 4167565 | 2026-08-02 02:48:15 |
| Status | A | ULS 4167565 | 2026-08-02 02:48:15 |
| Service | MW | ULS 4167565 | 2026-08-02 02:48:15 |
| Grant Date | 2019-06-05 | ULS 4167565 | 2026-08-02 02:48:15 |
| Expiration Date | 2029-06-05 | ULS 4167565 | 2026-08-02 02:48:15 |