Universal Licensing System
KNNH997
Harvard University Operations Center
License details
| ULS identifier | 1886750 |
|---|
| Call sign | KNNH997 |
|---|
| Radio service | IG |
|---|
| Status | A |
|---|
| Grant date | 2025-12-02 |
|---|
| Expiration | 2036-01-23 |
|---|
| Frequency range | 451.025 - 456.025 MHz (2 frequencies) |
|---|
| Locations | 2 |
|---|
| Representative location | MA |
|---|
| Source archive | l_LMpriv.zip |
|---|
| Dataset refreshed | 2026-08-02 01:26:07 |
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Frequency assignments
| Location | Antenna | Station class | Assigned MHz | Upper MHz | Carrier MHz | Output W | ERP W | Altitude |
|---|
| 1 | 1 | FB2 | 451.02500000 | | | 100.000000 | 335.000000 | |
| 3 | 1 | MO | 451.02500000 | | | 4.000000 | 4.000000 | |
| 2 | 1 | FX1 | 456.02500000 | | | 5.000000 | 5.000000 | |
| 3 | 1 | MO | 456.02500000 | | | 4.000000 | 4.000000 | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 1 | 1 | 451.02500000 | | 7K60FXD |
| 1 | 1 | 451.02500000 | | 11K2F1D |
| 1 | 1 | 451.02500000 | | 7K60FXE |
| 1 | 1 | 451.02500000 | | 11K2F3E |
| 3 | 1 | 451.02500000 | | 11K2F3E |
| 3 | 1 | 451.02500000 | | 11K2F1D |
| 3 | 1 | 451.02500000 | | 7K60FXD |
| 3 | 1 | 451.02500000 | | 7K60FXE |
| 2 | 1 | 456.02500000 | | 11K2F3E |
| 2 | 1 | 456.02500000 | | 7K60FXE |
| 2 | 1 | 456.02500000 | | 7K60FXD |
| 2 | 1 | 456.02500000 | | 11K2F1D |
| 3 | 1 | 456.02500000 | | 11K2F3E |
| 3 | 1 | 456.02500000 | | 7K60FXE |
| 3 | 1 | 456.02500000 | | 11K2F1D |
| 3 | 1 | 456.02500000 | | 7K60FXD |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 1 | T | 75 Mount Auburn Street, CAMBRIDGE, MIDDLESEX, MA | 42.37286111, -71.11866667 | 5.000 m | B | 55.000 m structure / 61.000 m overall | N |
| 2 | T | MA | | | | | |
| 3 | T | | | | | | |
Antennas
| Location | Antenna | Type | Make / model | Height | Polarization | Gain dB | Azimuth | Radiation center | Maximum EIRP W |
|---|
| 1 | 1 | T | | 61.000 m | | | | 38.000 | |
| 1 | 2 | T | | | | | | | |
| 1 | 3 | T | | | | | | | |
Control points
| Number | Address | County | Phone |
|---|
| 1 | 46 Blackstone Street, CAMBRIDGE, MA | MIDDLESEX | 6174955560 |
License history
| Date | File or call sign | Action |
|---|
| 2025-12-02 | KNNH997 | LIREN |
| 2025-11-24 | KNNH997 | LETRES |
| 2021-05-18 | KNNH997 | AUTHPR |
| 2021-05-16 | KNNH997 | FRATRM |
| 2021-05-16 | KNNH997 | LOATRM |
| 2021-05-16 | KNNH997 | ANATRM |
| 2021-03-10 | KNNH997 | LETTRS |
| 2020-09-09 | KNNH997 | LETCNS |
| 2019-12-05 | KNNH997 | LIMOD |
| 2018-10-02 | KNNH997 | LIMOD |
| 2017-04-17 | KNNH997 | LIMOD |
| 2015-12-02 | KNNH997 | LIREN |
| 2015-11-02 | KNNH997 | LETRES |
| 2015-10-14 | KNNH997 | LIAUA |
| 2015-10-13 | KNNH997 | ESUAPR |
| 2008-12-09 | KNNH997 | ESUFNR |
| 2005-11-02 | KNNH997 | LIREN |
| 2005-11-01 | KNNH997 | ESUAPR |
| 2005-10-31 | KNNH997 | LETRES |
| 2005-08-18 | KNNH997 | LIAUA |
| 2005-08-17 | KNNH997 | ESCAPR |
| 2001-10-15 | KNNH997 | AUDOPR |
| 2000-11-24 | KNNH997 | LICCNV |
| 2000-10-30 | KNNH997 | LIREN |
| 2000-10-30 | KNNH997 | AUTHPR |
| 2000-10-24 | KNNH997 | LETRES |
| KNNH997 | PNLISR |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 1886750 | 2026-08-02 01:26:07 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | KNNH997 | ULS 1886750 | 2026-08-02 01:26:07 |
| Status | A | ULS 1886750 | 2026-08-02 01:26:07 |
| Service | IG | ULS 1886750 | 2026-08-02 01:26:07 |
| Grant Date | 2025-12-02 | ULS 1886750 | 2026-08-02 01:26:07 |
| Expiration Date | 2036-01-23 | ULS 1886750 | 2026-08-02 01:26:07 |