| Support > Library > Integration Guides > Troubleshooting GPS Reception > Local interference
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Local interference
Another reason for poor reception is harmonics from a local broadcast interfering with the GPS L1 carrier of 1575.42 MHz. Certain television or FM radio broadcasts, while operating within their frequency allocation, can cause GPS jamming due to harmonics of the carrier. Television interference presents a greater challenge due to higher output power, typically 2-3 MW. Television stations with GPS jamming potential:
| Channel |
Harmonic |
| 66 |
2nd |
| 23 |
3rd |
| 10 |
8th |
| 7 |
9th |
| 6 |
18th & 19th |
| 5 |
20th |
FM radio stations, while lower in radiated power, can cause GPS jamming also. FM radio frequencies with GPS jamming potential:
| Frequency |
Harmonic |
| 104.8 - 105.2 |
15th |
| 98.3 - 98.7 |
16th |
| 92.5 - 92.9 |
17th |
| 87.3 - 87.7 |
18th |
Contact Spectracom Tech Support for more information on GPS interference.
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