Special Radio Direction Finder Calibration Stations for Atlantic and Gulf Coasts (1955)

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Special Radio Direction Finder Stations

Portland Head2 Light Station 43 37 23 70 12 30 296, 480
A3 ()
Nahant3 Life Boat Station 42 25 52 70 56 05 310, 480
A4 ()
Antenna is located on a gray concrete tower, 2,900 yards 126° from lifeboat station. A F. G. light is displayed from antenna tower during night calibration.
Coney Island Light Station 40 34 35 74 00 44 300, 480
C2 ()
Transmits continuously from 0800 to 1800 daily.
Brandywine Shoal4 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°.
Sandy Point Shoal5 Light Station 39 00 57 76 23 06 314, 480
F3 ()
For calibration on 314 kc, follow procedure on p. XIV (of light list); to change to 480 kc, dip flaghoist.
Mobile Point6 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 Jetty7 Light Station 28 59 24 89 08 24 312, 480
J4 ()
Antenna is located 400 feet 278°30' from light tower.
Algiers Radio Station 29 56 52 90 01 53 308, 480
J6 ()
Calcasieu7 Radiobeacon 29 46 45 93 20 32 306, 480
J7 ()
Antenna is located 75 yards 37° from regular radiobeacon antenna tower.
Galveston Jetty7 Light Station 29 19 40 94 41 33 286, 480
J5 ()
 2 Request for calibration service may also be made in advance to Commander, Cape Elizabeth Group, C/o Cape Elizabeth Lifeboat Station, U. S. Coast Guard, RFD No. 1, South Portland, Maine.
 3 Station may be contacted on 2,670 kc or via Coast Guard Radio Marshfield (NMF).
 4 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.
 5 Request for calibration service may also be made in advance directly to Commander, Baltimore Group, U. S. Coast Guard, 303 Appraiser's Stores Bldg., Baltimore 2, Md.
 6 Calibration service will be provided only on special radio direction finder transmitter. Request for calibration service may also be made to the light station.
 7 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 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 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 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 XIV (of light list).