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Field Strength Pro Ver3.1a
----remarks-----
Calculation method
(1) The space wave of field strength is calculated up to ten hops.
(2) Field strength at the propagation distance of up to 16000km is calculated, and for distances of more than that, field strength is assumed to be 0.
(3) The radius of the earth is assumed to be 6367km, and the effective coefficient of the radius of the earth is assumed to be 1 without adopting 4/3.
(4) Factors are calculated for sea, land and ice conditions which are defined by their electrical characteristics (conductivity and permittivity), as shown in ITU-R P.684-7 Table 1.
(5) Change of Factors (sea, land and ice conditions) in the route of the surface of the earth wave is made twice, for subsequent changes, factors are treated as the same as those of the last change.
(6) Forecast data of 10.7 cm solar radio flux(F10.7) is acquired from the server of NOAA.
NOAA SWPC FTP server
SWPC Predict
Receiver information
Latitude
degree
(−90 < Latitude < 90 deg)
Longitude
degree
(−180 ≤ Longitude < 180 deg)
Select Receiving City
Tokyo JAPAN
Osaka JAPAN
Beijing China
Berlin Germany
WashingtonDC USA
London UK
Time
/
/
:
:
(YYYY/MM/DD HH:MM:SS)
(1994 ≤ Year )
Transmitter information
Latitude
degree
(−90 < Latitude < 90 deg)
Longitude
degree
(−180 ≤ Longitude < 180 deg)
Frequency
kHz
(10 - 150 kHz)
Effective power
kW
Select Transmission Station
JJY 40kHz
JJY 60kHz
WWVB 60kHz
MSF 60kHz
DCF77 77.5kHz
Calculation range information
Max. Calculation No. of times < 10000
Calcuration times = Period(days) * 1440 / Interval(min.)
Calculation period
day
(1 - 30 day)
Calculation interval
min
(1 - 60 min)
When the button is pushed, the mail parameter is displayed as follows.
Please E-mail by your mail client. URL of the numerical result is answered.