LORAN-C Chains

©Brooke Clarke, N6GCE


LORAN-C stations are arranged in groups of 3 to 5 transmitting stations.  They all transmit on a frequency of 100 kHz.  In order to seperate one group of stations (called a chain) for another neighboring chain the time from when the master station transmits until it transmits again is different for each chain.  This time is called the Group Repetition Interval (in uS).  If you have a pulse generator that outputs pulses that are separated by this time interval and you use it to trigger a scope X axis (time axis) and you look at the output of a receiver tuned to 100 kHz you will see some pulses that are stable and also there will be other pulses that are not synchronized.

Following is a table of LORAN-C stations.  For the X, Y, and Z slave stations the location name, Latitude, Longitude and coding delay in uS is shown.

  The links attached to the city, state are to Google satellite images.
LORAN-C antennas (monopole towers) were typically 625 or 1350 ft in height.  The Middletown, CA tower may is made up of 7 red and white sections each of which may be either 90 feet or 192 feet high.  The Searchlight, NV station is  made up of four towers each 625 Feet tall.

Chain
GRI
Master
Slave 1
Slave 2
Slave 3
Slave 4
Slave 5
Canadian
E Coast
5930
Caribou, ME
46° 48' 27.305"N
67° 55' 37.159"W
X
Nantucket, MA
41° 15' 12.046"N
069° 58' 38.536"W
11000
Y
Cape Race, Newfoundland
46° 46' 32.286"N
53° 10' 27.606"W
25000
Z
Fox Harbor, Newfoundland
52° 22' 35.252"N
55° 42' 27.862"W
38000
na
na
Russian
American
5980
Petropavlovsk,
Kamchatka

53° 07' 47.584"N
157° 41'42.900"E
X
Attu, Attu Island,
AK

52° 49' 44.134"N
173° 10' 49.528"E
11000
Y
Alexandrovsk,
Sakhalen  Island

51° 04' 42.80"N
142° 42' 04.95"E
28000
na
na
na
Canadian
W Coast
5990
Williams Lake,
BC

51° 57' 58.876"N
122° 22' 01.686"W
X
Shoal Cove, AK
55° 26' 20.940"N
131° 15' 19.094"W
11000
Y
George, WA
47° 03' 48.096"N
119° 44' 38.976"W
27000
Z
Port Hardy, B.C.
50° 36' 29.830"N
127° 21' 28.489"W
41000
na
na
Newfound-
land
E Coast
7270
Comfort Cove,
 Newfoundland

49° 19' 53.57"N
54° 51' 42.57"W
W
Cape Race, Newfoundland
46° 46' 32.286"N
53° 10' 27.606"W
11000
X
Fox Harbor, Newfoundland
52° 22' 35.252"N
55° 42' 27.862"W
25000
na
na
na
Gulf
of
 Alaska
7960
Tok, AK
63° 19' 42.884"N
142° 48' 31.346"W
X
Kodiak,
Narrow  Cape

57° 26' 20.30"N
152° 22' 10.65"W
11000
Y
Shoal Cove, AK
55° 26' 20.940"N
131° 15' 19.094"W
26000
Z
Port Clarence, AK
65° 14' 40.372"N
166° 53' 11.996"W
45000
na
na
S. E. U.S.
7980
Malone, FL
30° 59' 38.870"N
85° 10' 08.751"W
W
Grangeville,
LA

30° 43' 33.149"N
90° 49' 59.539"W
11000
X
Raymondville,
TX

26° 31' 55.141"N
97° 49' 59.539"W
23000
Y
Jupiter, FL
27° 01' 58.63"N
80° 06' 52.97"W
43000
Z
Carolina Beach,
NC

34° 03' 46.17"N
77° 54' 46.21"W
59000
na
N
. Central
U.S.
8290
Havre, MT
48° 44' 38.589"N
109° 58' 53.613"W
W
Baudette, MN
48° 36' 49.947"N
94° 33' 17.915"W
11000
X
Gillette, WY
44° 00' 11.305"N
105° 37' 23.895"W
27000
Y
Williams Lake, BC
51° 57' 58.876"N
122° 22' 01.686"W
42000
na
na
Great Lakes
8970
Dana, IN
39° 51' 07.658"N
87° 29' 11.586"W
W
Malone, FL
30° 59' 38.870"N
85° 10' 08.751"W
11000
X
Seneca, NY
42° 42' 50.716"N
76° 49' 33.308"W
28000
W
Baudette, MN
48° 36' 49.947"N
94° 33' 17.915"W
44000
Z
Boise City, OK
36° 30' 20.783"N
102° 53' 59.487"W
59000
na
S. 
Central
U.S.
9610
Boise City, OK
36° 30' 20.783"N
102° 53' 59.487"W
V
Gillette, WY
44° 00' 11.305"N
105° 37' 23.895"W
11000
W
Searchlight, NV
35° 19' 18.305"N
114° 48' 16.881"W
25000
X
Las Cruces, NM
32°04'18.130"N
106°52'04.388"W
40000
Y
Raymondville,
TX

26° 31' 55.141"N
97°49'59.539"W
52000
Z
Grangeville,
LA

30°43'33.149"N
90°49'59.539"W
65000
W. U.S. 
9940
Fallon, NV
39° 33' 06.740"N
118° 49 55.816"W
W
George, WA
47° 03' 48.096"N
119° 44' 38.976"W
11000
X
Middletown, CA
38° 46' 57.110"N
122° 29' 43.976"W
27000
Y
Searchlight, NV
35° 19' 18.305"N
114° 48' 16.881"W
40000
na
na
N.E. U.S.
9960
Seneca, NY
42° 42' 50.716"N
76° 49' 33.308"W
W
Caribou, ME
46° 48' 27.305"N
67° 55' 37.159"W
11000
X
Nantucket, MA
41° 15' 12.046"N
069° 58' 38.536"W
25000
Y
Carolina Beach,
NC

34° 03' 46.17"N
77° 54' 46.21"W
39000
Z
Dana, IN
39° 51' 07.658"N
87° 29' 11.586"W
na
N. Pacific
9990
St Paul, Pribilof
 Island, AK
57° 09' 12.350"N
170° 15' 06.245"W
X
Attu, Attu Island,
AK

52° 49' 44.134"N
173° 10' 49.528"E
11000
Y
Port Clarence, AK
65° 14' 40.372"N
166° 53' 11.996"W
29000
Z
Kodiak,
Narrow  Cape

57° 26' 20.30"N
152° 22' 10.65"W
43000
na
na

 

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