Special Radio Direction Finder Calibration Stations for Atlantic and Gulf Coasts (1965)

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Special Radio Direction Finder Stations

Nahant2 Remote Control 42 25 52 70 56 05 290, 480 Antenna is located on a grey concrete tower, 2,900 yards 126° from old lifeboat station.
Portland Head1 Light Station 43 37 23 70 12 30 296, 480
Brandywine Shoal3 Light Station 38 59 11 75 06 47 313, 480
Coney Island7 Light Station 40 34 35 74 00 44 307, 480 Transmits continuously from 0800 to 1800 (eastern standard time) daily.
Cape Henry7 Light Station 36 55 37 76 00 26 310, 480 Special fixed white light of 100 cp displayed at north center of light tower during calibration, visible from 90° to 270°.
Thomas Point Shoal4 Light Station 38 53 56 76 26 11 310, 480 For calibration on 310 kc, follow procedure on p. XVII (of light list); to change to 480 kc, dip flaghoist.
Mobile Point5 Light Station 30 13 39 88 01 26 288, 480 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 Jetty6 Light Station 28 59 24 89 08 24 290, 480 Antenna is located 400 feet 278°30' from light tower.
Galveston Jetty6 Light Station 29 19 40 94 41 33 286, 480
Aransas Pass6 Light Station 27 50 18 97 03 30 288, 480 Antenna is located 180 feet 182°30' from radiobeacon antenna tower.
 1 Request for calibration service may also be made in advance to Commander, Portland Group, c/o U. S. Coast Guard Base, 259 High Street, South Portland, Maine 04106. Station may be contacted on 2,182 kc via Cape Elizabeth Lifeboat Station.
 2 Station is remotely controlled from Point Allerton Lifeboat Station, Mass. Requests for calibration service should be made via Coast Guard Radio Marshfield (NMF) or via Point Allerton Lifeboat Station on 2,182 kc.
 3 Request for calibration service may also be made in advance directly to the light station or to Commanding Officer, Cape May, U. S. Coast Guard Moorings, P. O. Box 31, Cape May, New Jersey.
 4 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, Md. 21226
 5 Calibration service will be provided only on special radio direction finder transmitter. Request for calibration service may also be made to the light station.
 6 Request for calibration service may also be made in advance directly to the station.
 7 Calibration service on frequencies shown is continuous carrier modulated for tone operation. When transmitting, 20 second dash and station identification code is superimposed on continuous carrier.

All stations transmit continuously during the time required for calibration with keyed tone modulated carrier (A-2 emission), except where noted, 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 usual whistle signal or flag hoist.