KDX54: NOAA Weather Radio for Big Rock Ridge, California
KDX54 is the NOAA Weather Radio transmitter at Big Rock Ridge (transmitter at N. San Francisco Bay), broadcasting on 162.500 MHz at 75 watts. It carries the National Weather Service San Francisco office's broadcast and covers 15 counties, each listed below with the SAME code an alert radio needs to wake for that county and stay quiet for the rest.
| Callsign | KDX54 |
|---|---|
| Frequency | 162.500 MHz |
| Transmitter | Big Rock Ridge (transmitter at N. San Francisco Bay), California |
| Power | 75 watts |
| Forecast office | NWS San Francisco |
| Status | Normal (NWS data, July 2026) |
Marine radios often label 162.500 MHz as WX6, but WX channel numbers vary by brand - go by the frequency.
Counties KDX54 covers
| County | State | SAME code | Note |
|---|---|---|---|
| Contra Costa | California | 006013 | WEST |
| Marin | California | 006041 | |
| Napa | California | 006055 | |
| San Francisco | California | 006075 | |
| San Mateo | California | 006081 | |
| Santa Clara | California | 006085 | |
| Sonoma | California | 006097 | |
| Sonoma | California | 106097 | SOUTHEAST |
| Sonoma | California | 206097 | SOUTH |
| Sonoma | California | 306097 | WEST AND SOUTH |
| Sonoma | California | 406097 | EAST AND SOUTH |
| Sonoma | California | 506097 | ALL |
| Sonoma | California | 606097 | WEST |
| Sonoma | California | 706097 | ALL |
| Sonoma | California | 906097 | ALL |
A county marked with a note (for example partial coverage) is served for that portion only. Program the six-digit code into your radio's SAME location list - the SAME code guide walks through it, and how alert radios work explains what the radio does with it.
Hearing KDX54
Any receiver that tunes 162.500 MHz FM can listen: scanners, VHF ham radios, marine sets, or a software-defined receiver. What those do not do is wake you at 3 a.m. - for that you want a dedicated radio with SAME alerting, covered in the buyer's guide.
Every California transmitter, county and SAME code: NOAA Weather Radio in California. Or look any county up with the finder.
Sources:
- “NWR County Coverage Listings”. weather.gov. Archived from the original on 2026-07-19. Retrieved 2026-07-16. Every figure on this page - frequency, transmitter site, power, operational status, and county SAME codes - is from this dataset. Transmitters move, change power, and go down for maintenance; verify locally before you rely on it.