Universal Licensing System
WPPU903
Proactive Special Security
License details
| ULS identifier | 1820281 |
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| Call sign | WPPU903 |
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| Radio service | IG |
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| Status | E |
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| Grant date | 2004-12-21 |
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| Expiration | 2015-01-24 |
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| Cancellation | 2015-03-28 |
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| Frequency range | 451.775 - 456.775 MHz (2 frequencies) |
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| Locations | 2 |
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| Representative location | GAITHERSBURG, MONTGOMERY, MD |
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| Coordinates | 39.1665000, -77.1710833 |
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| Source archive | l_LMpriv.zip |
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| Dataset refreshed | 2026-08-02 01:14:04 |
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Frequency assignments
| Location | Antenna | Station class | Assigned MHz | Upper MHz | Carrier MHz | Output W | ERP W | Altitude |
|---|
| 1 | 1 | FB2 | 451.77500000 | | | 25.000000 | 70.000000 | |
| 3 | 1 | MO | 451.77500000 | | | 4.000000 | 4.000000 | |
| 2 | 1 | FX1 | 456.77500000 | | | 25.000000 | 50.000000 | |
| 3 | 1 | MO | 456.77500000 | | | 30.000000 | 30.000000 | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 451.77500000 | | 20K0F3E |
| 3 | 1 | 451.77500000 | | 20K0F3E |
| 2 | 1 | 456.77500000 | | 20K0F3E |
| 3 | 1 | 456.77500000 | | 20K0F3E |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | 9701 FIELDS ROAD, GAITHERSBURG, MONTGOMERY, MD | 39.11344444, -77.19275000 | 152.000 m | BPIPE | 85.000 m structure / 87.000 m overall | N |
| 2 | T | 8365 SNOUFFER SCHOOL ROAD, GAITHERSBURG, MONTGOMERY, MD | 39.16650000, -77.17108333 | 120.000 m | B | 6.000 m structure / 6.000 m overall | N |
| 3 | T | | | | | | |
Antennas
| Location | Antenna | Type | Make / model | Height | Polarization | Gain dB | Azimuth | Radiation center | Maximum EIRP W |
|---|
| 1 | 1 | T | | 87.000 m | | | | 122.300 | |
| 1 | 2 | T | | 6.000 m | | | | 8.000 | |
| 1 | 3 | T | | | | | | | |
Control points
| Number | Address | County | Phone |
|---|
| 1 | 8365 SNOUFFER SCHOOL ROAD, GAITHERSBURG, MD | | 3019636480 |
| 2 | 19705A WATERS ROAD, GERMANTOWN, MD | MONTGOMERY | 3015150212 |
License history
| Date | File or call sign | Action |
|---|
| 2015-03-28 | WPPU903 | LIEXP |
| 2014-11-03 | WPPU903 | LETRES |
| 2005-06-10 | WPPU903 | LIMOD |
| 2004-12-21 | WPPU903 | LIREN |
| 2004-12-20 | WPPU903 | ESUAPR |
| 2004-11-01 | WPPU903 | LETRES |
| 2004-03-08 | WPPU903 | AUDOPR |
| 2002-05-13 | WPPU903 | LIASS |
| 2000-11-23 | WPPU903 | LICCNV |
| 2000-01-24 | WPPU903 | LIISS |
| 2000-01-24 | WPPU903 | AUTHPR |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 1820281 | 2026-08-02 01:14:04 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WPPU903 | ULS 1820281 | 2026-08-02 01:14:04 |
| Status | E | ULS 1820281 | 2026-08-02 01:14:04 |
| Service | IG | ULS 1820281 | 2026-08-02 01:14:04 |
| Grant Date | 2004-12-21 | ULS 1820281 | 2026-08-02 01:14:04 |
| Expiration Date | 2015-01-24 | ULS 1820281 | 2026-08-02 01:14:04 |
| Cancellation Date | 2015-03-28 | ULS 1820281 | 2026-08-02 01:14:04 |