Special Radio Direction Finder Calibration Stations for Atlantic and Gulf Coasts (1950)

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Special Radio Direction Finder Stations

Coney Island Light Station 40 34 35 74 00 44 300, 480
C2 ()
Transmits continuously from 0800 to 1800 daily.
Brandywine Shoal2 Light Station 38 59 11 75 06 47 288, 480
C3 ()
Cape Henry Light Station 36 55 37 76 00 26 304, 480
F2 ()
Special fixed white light of 100 cp. displayed at north center of light tower during calibration, visible from 90° to 270°.
Mobile Point3 Light Station 30 13 39 88 01 26 312, 480
J3 ()
Special directional fixed white light of 200,000 cp. displayed from gallery of structure during daytime calibration, visible from 24° to 30°.
South Pass West Jetty4 Light Station 28 59 24 89 08 24 312, 480
J4 ()
Antenna lead-in at antenna towers, 25 feet 326° from light tower.
 2 Request for calibration service may also be made in advance directly to the light station or to Commander, Philadelphia Group, U. S. Coast Guard, Customhouse, Philadelphia 6, Pa.
 3 Calibration service will be provided only on special radio direction finder transmitter. Request for calibration service may also be made to the light station.
 4 Request for calibration service may also be made in advance directly to the station.

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 lead-in 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 page 4 (of light list), unless otherwise stated. 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 usual whistle signal or flag hoist. At stations that also have radiobeacons, when previous arrangements have not been made, the regular radiobeacon transmitter will be operated for calibration purposes in answer to the usual whistle or flag hoist for calibration set forth under "Special operation of radiobeacon stations for calibration of direction finders" on page 11 (of light list).