 |
Optimal Working Frequencies (MHz) for: US MIDWEST
For July 2008 using the predicted smoothed SSN and Flux. Created by NW7US on June 03, 2007 |
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These NW7US radio signal path propagation tables are set up to cover main regions of the world. Each chart displays the FOT (or Optimal Working Frequency) at each UTC hour, for the paths given.
These radio frequencies are a percentage below the MUF (Maxiumum Usable Frequencies), and should be acurate for about 80 percent of the month. However, if a geomagnetic storm, a solar flare, or other event occurs, there is no promise that a signal will actually make it through the path in question. Often, during ionospheric storms and solar events (like a solar flare), the FOT is lower, or the path might even be closed.
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UTC Time:
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00
|
01
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02
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03
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04
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05
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06
|
07
|
08
|
09
|
10
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11
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12
|
13
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14
|
15
|
16
|
17
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18
|
19
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20
|
21
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22
|
23
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TO/FROM US MIDWEST
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||||||||||||||||||||||||
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CARIBBEAN
|
24
|
24
|
24
|
23
|
22
|
20
|
18
|
16
|
15
|
14
|
13
|
13
|
14
|
16
|
18
|
19
|
20
|
21
|
22
|
23
|
23
|
24
|
24
|
24
|
|
NORTHERN SOUTH AMERICA
|
26
|
25
|
25
|
23
|
21
|
19
|
18
|
16
|
15
|
14
|
13
|
13
|
13
|
16
|
18
|
20
|
21
|
22
|
23
|
24
|
25
|
25
|
25
|
26
|
|
CENTRAL SOUTH AMERICA
|
26
|
24
|
22
|
20
|
18
|
17
|
16
|
15
|
14
|
14
|
13
|
15
|
17
|
19
|
21
|
23
|
24
|
25
|
26
|
27
|
28
|
28
|
28
|
28
|
|
SOUTHERN SOUTH AMERICA
|
21
|
16
|
15
|
14
|
13
|
13
|
12
|
12
|
12
|
12
|
12
|
11
|
13
|
17
|
20
|
21
|
23
|
24
|
25
|
26
|
27
|
28
|
26
|
24
|
|
WESTERN EUROPE
|
15
|
13
|
12
|
12
|
11
|
10
|
12
|
13
|
12
|
12
|
14
|
15
|
17
|
18
|
18
|
19
|
19
|
20
|
20
|
20
|
19
|
19
|
18
|
17
|
|
EASTERN EUROPE
|
10
|
10
|
9
|
9
|
9
|
13
|
13
|
12
|
11
|
11
|
12
|
15
|
16
|
18
|
18
|
19
|
20
|
19
|
19
|
18
|
17
|
16
|
14
|
11
|
|
EASTERN NORTH AMERICA
|
18
|
18
|
18
|
17
|
17
|
15
|
14
|
13
|
12
|
11
|
10
|
10
|
12
|
13
|
14
|
15
|
16
|
16
|
17
|
17
|
17
|
18
|
18
|
18
|
|
CENTRAL NORTH AMERICA
|
8
|
8
|
8
|
8
|
8
|
8
|
7
|
6
|
6
|
5
|
5
|
5
|
5
|
6
|
6
|
7
|
7
|
7
|
8
|
8
|
8
|
8
|
8
|
8
|
|
WESTERN NORTH AMERICA
|
14
|
14
|
14
|
14
|
13
|
13
|
13
|
12
|
11
|
10
|
9
|
9
|
9
|
9
|
10
|
11
|
12
|
12
|
13
|
13
|
13
|
14
|
14
|
14
|
|
SOUTHERN NORTH AMERICA
|
16
|
16
|
16
|
15
|
15
|
14
|
13
|
12
|
11
|
10
|
9
|
9
|
9
|
10
|
11
|
12
|
13
|
14
|
14
|
15
|
15
|
15
|
16
|
16
|
|
HAWAII
|
22
|
22
|
22
|
22
|
22
|
22
|
21
|
20
|
18
|
17
|
15
|
14
|
13
|
13
|
12
|
12
|
14
|
15
|
17
|
18
|
19
|
20
|
21
|
21
|
|
NORTHERN AFRICA
|
20
|
19
|
17
|
16
|
15
|
15
|
15
|
14
|
14
|
14
|
15
|
16
|
17
|
18
|
18
|
19
|
19
|
20
|
20
|
20
|
20
|
20
|
20
|
20
|
|
CENTRAL AFRICA
|
17
|
16
|
15
|
14
|
13
|
13
|
15
|
14
|
14
|
14
|
15
|
16
|
17
|
18
|
18
|
19
|
19
|
20
|
20
|
20
|
20
|
20
|
20
|
19
|
|
SOUTH AFRICA
|
14
|
13
|
13
|
13
|
12
|
12
|
12
|
19
|
18
|
17
|
17
|
18
|
20
|
22
|
24
|
25
|
26
|
26
|
24
|
20
|
18
|
17
|
16
|
15
|
|
MIDDLE EAST
|
15
|
13
|
13
|
13
|
14
|
15
|
14
|
13
|
12
|
12
|
14
|
15
|
17
|
18
|
19
|
19
|
20
|
20
|
20
|
20
|
19
|
19
|
17
|
16
|
|
JAPAN
|
19
|
19
|
20
|
20
|
19
|
19
|
18
|
17
|
15
|
14
|
13
|
12
|
12
|
14
|
16
|
15
|
14
|
14
|
14
|
15
|
16
|
17
|
18
|
18
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|
CENTRAL ASIA
|
20
|
20
|
20
|
20
|
19
|
18
|
17
|
16
|
15
|
13
|
12
|
12
|
12
|
14
|
16
|
17
|
18
|
17
|
15
|
14
|
14
|
15
|
17
|
18
|
|
INDIA
|
12
|
14
|
16
|
17
|
17
|
15
|
13
|
12
|
11
|
11
|
10
|
12
|
15
|
17
|
16
|
15
|
14
|
12
|
10
|
9
|
9
|
9
|
8
|
8
|
|
THAILAND
|
16
|
18
|
19
|
19
|
18
|
17
|
16
|
14
|
13
|
12
|
11
|
11
|
13
|
15
|
16
|
18
|
19
|
18
|
16
|
15
|
14
|
13
|
13
|
15
|
|
AUSTRALIA
|
29
|
29
|
29
|
29
|
29
|
28
|
28
|
26
|
23
|
20
|
19
|
17
|
16
|
15
|
14
|
14
|
13
|
13
|
12
|
12
|
17
|
22
|
25
|
27
|
|
CHINA
|
18
|
19
|
19
|
19
|
18
|
17
|
16
|
14
|
13
|
12
|
11
|
11
|
13
|
15
|
17
|
17
|
15
|
14
|
13
|
13
|
13
|
15
|
16
|
17
|
|
SOUTH PACIFIC
|
28
|
28
|
28
|
27
|
26
|
24
|
21
|
15
|
14
|
14
|
13
|
13
|
12
|
12
|
12
|
12
|
12
|
11
|
11
|
21
|
24
|
26
|
27
|
28
|