Universal Licensing System
WRDM709
Chelmsford, Town of Police Dept
License details
| ULS identifier | 4167571 |
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| Call sign | WRDM709 |
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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 | 17875 - 17965 MHz (2 frequencies) |
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| Locations | 3 |
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| Representative location | Chelmsford, MIDDLESEX, MA |
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| Coordinates | 42.5850000, -71.3649167 |
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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 | 17875.00000000 | | | | | |
| 1 | 1 | FXO | 17875.00000000 | | | | | |
| 1 | 1 | FXO | 17875.00000000 | | | | | |
| 1 | 2 | FXO | 17965.00000000 | | | | | |
| 1 | 2 | FXO | 17965.00000000 | | | | | |
| 1 | 2 | FXO | 17965.00000000 | | | | | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 17875.00000000 | | 26M8D7W |
| 1 | 1 | 17875.00000000 | | 26M8D7W |
| 1 | 1 | 17875.00000000 | | 26M8D7W |
| 1 | 2 | 17965.00000000 | | 26M8D7W |
| 1 | 2 | 17965.00000000 | | 26M8D7W |
| 1 | 2 | 17965.00000000 | | 26M8D7W |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | Summit Ave, Chelmsford, MIDDLESEX, MA | 42.58500000, -71.36491667 | 125.000 m | LTOWER | 22.900 m structure / 24.400 m overall | |
| 2 | R | | 42.60583333, -71.37650000 | 106.100 m | | | |
| 3 | R | | 42.59869444, -71.34697222 | 49.400 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 | 337.7000 | | |
| 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 | 44.1000 | | |
License history
| Date | File or call sign | Action |
|---|
| 2020-09-12 | WRDM709 | LIAUA |
| 2020-09-09 | WRDM709 | LETCNS |
| 2019-06-05 | WRDM709 | LIISS |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 4167571 | 2026-08-02 02:48:15 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WRDM709 | ULS 4167571 | 2026-08-02 02:48:15 |
| Status | A | ULS 4167571 | 2026-08-02 02:48:15 |
| Service | MW | ULS 4167571 | 2026-08-02 02:48:15 |
| Grant Date | 2019-06-05 | ULS 4167571 | 2026-08-02 02:48:15 |
| Expiration Date | 2029-06-05 | ULS 4167571 | 2026-08-02 02:48:15 |