Universal Licensing System
WPJK581
AMS Spectrum Holdings, LLC
License details
| ULS identifier | 1136244 |
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| Call sign | WPJK581 |
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| Radio service | GS |
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| Status | A |
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| Grant date | 2021-08-17 |
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| Expiration | 2031-07-08 |
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| Frequency range | 929.4125 MHz |
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| Locations | 4 |
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| Representative location | GRAYLING, CRAWFORD, MI |
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| Coordinates | 44.6139167, -84.6847500 |
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| Source archive | l_LMcomm.zip |
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| Dataset refreshed | 2026-08-16 01:10:07 |
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Frequency assignments
| Location | Antenna | Station class | Assigned MHz | Upper MHz | Carrier MHz | Output W | ERP W | Altitude |
|---|
| 2 | 1 | FB6C | 929.41250000 | | | 500.000000 | 3500.000000 | |
| 3 | 1 | FB6C | 929.41250000 | | | 500.000000 | 3500.000000 | |
| 4 | 1 | FB6C | 929.41250000 | | | 500.000000 | 3500.000000 | |
| 5 | 1 | FB6C | 929.41250000 | | | 500.000000 | 3500.000000 | |
Emission designators
| Location | Antenna | Frequency MHz | Upper MHz | Emission |
|---|
| 2 | 1 | 929.41250000 | | 20K0F1D |
| 3 | 1 | 929.41250000 | | 20K0F1D |
| 4 | 1 | 929.41250000 | | 20K0F1D |
| 5 | 1 | 929.41250000 | | 20K0F1D |
Licensed locations
| Location | Type | Address | Coordinates | Ground elevation | Structure | Height | NEPA |
|---|
| 2 | T | 3784 W 3 MILE RD, GRAYLING, CRAWFORD, MI | 44.61391667, -84.68475000 | 436.000 m | TOWER | 59.000 m structure / 62.000 m overall | N |
| 3 | T | 1801 E HINES, MIDLAND, MIDLAND, MI | 43.63613889, -84.29833333 | 190.000 m | TOWER | 84.000 m structure / 88.000 m overall | N |
| 4 | T | CENTRAL MICHIGAN UNIVERSITY, MOUNT PLEASANT, ISABELLA, MI | 43.57586111, -84.77475000 | 243.000 m | TOWER | 152.000 m structure / 167.000 m overall | N |
| 5 | T | BAY CITY JARMAN & PINE ST, ESSEXVILLE, BAY, MI | 43.62086111, -83.83302778 | 178.000 m | TOWER | 244.000 m structure / 259.000 m overall | N |
Antennas
| Location | Antenna | Type | Make / model | Height | Polarization | Gain dB | Azimuth | Radiation center | Maximum EIRP W |
|---|
| 1 | 2 | T | | 62.000 m | | | | 125.000 | |
| 1 | 3 | T | | 88.000 m | | | | 70.000 | |
| 1 | 4 | T | | 167.000 m | | | | 93.000 | |
| 1 | 5 | T | | 259.000 m | | | | 161.000 | |
Control points
| Number | Address | County | Phone |
|---|
| 1 | 28800 ORCHARD LAKE RD 200 FARMINGTON, HILLS, MI | | 8108514242 |
License history
| Date | File or call sign | Action |
|---|
| 2026-07-21 | WPJK581 | LIAUA |
| 2022-03-29 | WPJK581 | LIAUA |
| 2021-08-17 | WPJK581 | LIREN |
| 2021-04-12 | WPJK581 | LETRES |
| 2015-12-04 | WPJK581 | LIAUA |
| 2015-12-03 | WPJK581 | ESUAPR |
| 2013-04-20 | WPJK581 | LIAUA |
| 2013-04-19 | WPJK581 | ESUAPR |
| 2011-08-02 | WPJK581 | LIREN |
| 2011-04-11 | WPJK581 | LETRES |
| 2009-11-24 | WPJK581 | LIASS |
| 2009-11-13 | WPJK581 | ESUAPR |
| 2007-06-27 | WPJK581 | ESUAPR |
| 2007-06-27 | WPJK581 | LIAUA |
| 2007-04-28 | WPJK581 | LIAUA |
| 2007-04-27 | WPJK581 | ESUAPR |
| 2007-02-17 | WPJK581 | LITRAN |
| 2006-08-01 | WPJK581 | LIAUA |
| 2006-07-31 | WPJK581 | ESUAPR |
| 2006-06-22 | WPJK581 | LIAUA |
| 2006-06-21 | WPJK581 | ESUAPR |
| 2006-06-02 | WPJK581 | LITRAN |
| 2005-11-23 | WPJK581 | ESUFNR |
| 2005-02-08 | WPJK581 | LIAUA |
| 2005-02-07 | WPJK581 | ESUAPR |
| 2005-02-05 | WPJK581 | AUDOPR |
| 2004-12-07 | WPJK581 | LETAFU |
| 2004-09-28 | WPJK581 | LETAUS |
| 2002-07-13 | WPJK581 | LIAUA |
| 2001-06-12 | WPJK581 | LIREN |
| 2001-04-16 | WPJK581 | LETRES |
| 2000-09-15 | WPJK581 | LICCNV |
| 2000-07-24 | WPJK581 | LIASS |
| 2000-07-24 | WPJK581 | AUTHPR |
Sources and provenance
| Source | Source record | Retrieved | Match |
|---|
| ULS | 1136244 | 2026-08-16 01:10:07 | Official Bulk Record |
Selected field provenance
| Field | Displayed value | Source | Observed |
|---|
| Call Sign | WPJK581 | ULS 1136244 | 2026-08-16 01:10:07 |
| Status | A | ULS 1136244 | 2026-08-16 01:10:07 |
| Service | GS | ULS 1136244 | 2026-08-16 01:10:07 |
| Grant Date | 2021-08-17 | ULS 1136244 | 2026-08-16 01:10:07 |
| Expiration Date | 2031-07-08 | ULS 1136244 | 2026-08-16 01:10:07 |