Special Radio Direction Finder Calibration Stations for Pacific Coast (1968)
Special Radio Direction Finder Stations
| Los Angeles Harbor1 | Light Station | 33 42 30 | 118 15 02 | 480 |    | |
| Point Blunt | Light Station | 37 51 10 | 122 25 04 | 288, 480 | | |
| Alki Point | Light Station | 47 34 35 | 122 25 10 | 300, 480 | | |
| Guard Island | Light Station | 55 26 47 | 131 52 45 | 294, 480 | | |
| Diamond Head2 | Light Station | 21 15 32 | 157 48 44 | 310, 480 | | |
| Point Loma | Light Station | 32 39 54 | 117 14 30 | 480 | |
| 1 | Request for calibration service may also be made to the light station. |
| 2 | Operated for special calibration service only on request in advance to Commander, 14th C. G. District, Honolulu. Periods of operation limited to weekdays from 1800 GMT to 0300 GMT. |
All stations transmit continuously during the time required for calibration with keyed tone modulated carrier (A-2 emission) and have a reliable range of 10 miles. Their assigned characteristic is transmitted twice followed by a 20-second dash, the complete sequence being repeated twice per minute. The antenna is located on the light structure unless otherwise indicated under "Remarks". In the event special calibration service interferes with the operation of regular radiobeacon transmission, the special calibration service will not be given.
Special calibration operation will be made only upon request in advance to the district commander in whose district the calibration station is located, the address and district limits of which are listed on p. IV (of light list). The day, time, and frequency on which special calibration service is desired must be stated. If service is desired on both frequencies listed, the time that transmission on each frequency is desired must be specified. Upon arrival at the station on the date and hour specified, station personnel may be contacted by means of the usual whistle signal or flag hoist.