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Compilation of Potential Signal Sources |
The potential signal sources are compiled in Table 1.
Table 1: Voice (A3) Capable Stations Within 15 kHz of 3105
kHz.
Station (Call Sign) |
Freq kHz |
Power watts |
Latitude |
Longitude |
Function |
Winslow, Arizona (KGTA) |
3088 |
400 |
35-00 N |
110-59 W |
FA |
Voronej, USSR (RFQH) |
3090 |
250 |
51-17 N |
38-53 E |
FX |
King Cove, Alaska (KMS) |
3092.5 |
100 |
55-04 N |
162-19 W |
FC |
Quarry Heights, Panama Canal Zone (WVL) |
3100 |
75 |
8-57 N |
79-33 W |
FA |
Melbourne, Australia (3AR) {5 x 620 kHz} |
3100 |
70 |
38-47 S |
144-58 E |
BC |
Navarin Mys, USSR (UGU1) |
3100 |
40 |
62-17 N |
179-04 E |
FC |
Stalino, USSR (RW26) {4 x 776 kHz} |
3104 |
600 |
47-59 N |
37-48 E |
BC |
Gardner Island (KHAQQ) |
3105 |
50 |
4-40 S |
174-32 W |
aircraft |
Oust-Kiakhta, USSR (UTC) |
3105 |
60 |
50-13 N |
106-17 E |
FC, FX |
San Diego area aircraft |
3105 |
50 |
32-48 N |
117-06 W |
aircraft |
Los Angeles area aircraft |
3105 |
50 |
34-06 N |
118-24 W |
aircraft |
San Francisco area aircraft |
3105 |
50 |
37-48 N |
122-24 W |
aircraft |
Seattle area aircraft |
3105 |
50 |
47-47 N |
122-18 W |
aircraft |
Billings, USSR (UQP1) |
3110 |
40 |
69-53 N |
176-05 E |
FC |
Oufa, USSR (UTP) |
3110 |
15 |
54-43 N |
55-37 E |
FC |
Anadyr, USSR (UIF1) |
3120 |
150 |
64-50 N |
177-22 E |
FC |
Nijne-Angarsk, USSR (UMA) |
3120 |
100 |
55-46 N |
109-35 E |
FC |
Oulan-Oude, USSR (UTR) |
3120 |
150 |
50-00 N |
107-35E |
FC |
|
Each source in Table 1 was tested using the method described in Appendix
A, to determine the feasibility of reception at each DF site under hypothetical
ideal propagation conditions. This test provides a conservative basis for
deciding whether the source can be ruled out as the potential origin of signals
at a given DF site. If the source signal could not produce the required receiver
input SNR under the ideal conditions of the test, then it could not do so
under realistic propagation conditions. The test results are shown in Table
2.
Table 2: Signal Source Reception Feasibility Test Results
Source |
Freq
kHz |
Rcvr
Sel
Atten
dB |
RcvrMokapu |
Dist nmi
Midway |
Wake |
Howland |
Dist
nmi |
FS
SNR
dB |
Dist
nmi |
FS
SNR
dB |
Dist
nmi |
FS
SNR
dB |
Dist
nmi |
FS
SNR
dB |
Winslow |
3088 |
110 |
2615 |
-36 |
3384 |
-39 |
4401 |
-41 |
4194 |
-40 |
Voronej |
3090 |
103 |
6364 |
-39 |
5712 |
-38 |
5781 |
-38 |
7205 |
-40 |
King Cove |
3092 |
92 |
2040 |
-22 |
1765 |
-21 |
2613 |
-24 |
3371 |
-27 |
Quarry Hts |
3100 |
23 |
4583 |
38 |
5566 |
37 |
6533 |
36 |
5709 |
37 |
Melbourne |
3100 |
23 |
4803 |
38 |
4499 |
39 |
3642 |
41 |
3133 |
42 |
Navarin Mys |
3100 |
23 |
2637 |
40 |
2097 |
43 |
2659 |
41 |
3704 |
38 |
Stalino |
3104 |
0 |
6555 |
68 |
5852 |
69 |
5923 |
69 |
7369 |
67 |
Gardner Island |
3105 |
0 |
1815 |
68 |
1941 |
43 |
1810 |
68 |
350 |
68 |
Oust-Kiakhta |
3105 |
0 |
4645 |
60 |
3653 |
63 |
3408 |
63 |
4883 |
60 |
San Diego acft |
3105 |
0 |
2303 |
66 |
3105 |
63 |
4138 |
61 |
3853 |
61 |
Los Angeles acft |
3105 |
0 |
2228 |
66 |
3021 |
63 |
4053 |
61 |
3848 |
61 |
San Fran acft |
3105 |
0 |
2081 |
67 |
2775 |
64 |
3825 |
61 |
3697 |
62 |
Seattle acft |
3105 |
0 |
2325 |
66 |
2791 |
64 |
3805 |
61 |
3954 |
61 |
Billings |
3110 |
23 |
3062 |
39 |
2539 |
41 |
3079 |
39 |
4179 |
39 |
Oufa |
3110 |
23 |
5939 |
29 |
5175 |
31 |
5176 |
31 |
6612 |
28 |
Anadyr |
3120 |
103 |
2777 |
-34 |
2226 |
-32 |
2797 |
-34 |
3865 |
-41 |
Nijne-Angarsk |
3120 |
103 |
4415 |
-40 |
3500 |
-38 |
3364 |
-38 |
4826 |
-41 |
Oulan-Oude |
3120 |
103 |
4571 |
-39 |
3604 |
-36 |
3349 |
-36 |
4825 |
-39 |
|
The receiver selectivity
attenuation corresponding to the source frequency is shown, together with the
source distance from each DF site, and the free-space SNR resulting from
the test. Recalling that the threshold input SNR, for detecting the presence
of an A3 signal without distinguishing any words is 41 dB for this analysis,
the results shown in Table 2 can be sorted into three categories. The SNR
for signals from some sources robustly exceed the threshold at some or all
DF sites; some marginally exceed or fall below the threshold; and some fall
far below the threshold.
Retaining the first two categories and deleting the third yields the following table of potential sources retained for further consideration in the analysis.
Table 3: Signal Sources Retained for Further Analysis
Source |
Freq
kHz |
Rcvr
Sel
Attend
dB |
Mokapu |
Midway |
Wake |
Howland |
Dist
nmi |
FS
SNR
dB
|
Dist
nmi |
FS
SNR
dB
|
Dist
nmi |
FS
SNR
dB
|
Dist
nmi |
FS
SNR
dB
|
Quarry Hts |
3100 |
23 |
4583 |
38 |
5566 |
37 |
6533 |
36 |
5709 |
37 |
Melbourne |
3100 |
23 |
4803 |
38 |
4499 |
39 |
3642 |
41 |
3133 |
42 |
Navarin Mys |
3100 |
23 |
2637 |
40 |
2097 |
43 |
2659 |
41 |
3704 |
38 |
Stalino |
3104 |
0 |
6555 |
68 |
5852 |
69 |
5923 |
69 |
7369 |
67 |
Gardner Island |
3105 |
0 |
1815 |
68 |
1941 |
43 |
1810 |
68 |
350 |
68 |
Oust-Kiakhta |
3105 |
0 |
4645 |
60 |
3653 |
63 |
3408 |
63 |
4883 |
60 |
San Diego acft |
3105 |
0 |
2303 |
66 |
3105 |
63 |
4138 |
61 |
3853 |
61 |
Los Angeles acft |
3105 |
0 |
2228 |
66 |
3021 |
63 |
4053 |
61 |
3848 |
61 |
San Fran acft |
3105 |
0 |
2081 |
67 |
2775 |
64 |
3825 |
61 |
3697 |
62 |
Seattle acft |
3105 |
0 |
2325 |
66 |
2791 |
64 |
3805 |
61 |
3954 |
61 |
Billings |
3110 |
23 |
3062 |
39 |
2539 |
41 |
3079 |
39 |
4179 |
39 |
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