Specifications

HF Propagation Predictions
TRX-Manager includes HF Propagation predictions via the F2 Layer from the DXCC window.
Displaying the predictions
Once DXCC Info window is open, you only need to click the main azimuth indicator in order to
toggle to the HF Propagation prediction mode. Predictions are then displayed for the current
country according to a diagram with indication of maximum and lower usable frequencies (
MUF/LUF) for each hour of the day.
Click the Propagation diagram to toggle to
Azimuth indicator (and vice versa)
Maximum usable frequency is the highest frequency which supports reflection (in fact
refraction) through F2 Layer (MUF) between two points. Minimum usable frequency (LUF) is
the maximum E Layer's Cut Off Frequency (ECOF). A red dot indicates your current position in
the Time/Frequency space.
By moving the mouse on the diagram, the touch help gives you, for the current time : MUF,
LUF and a prediction of Hops to the current country. You will note that if LUF is higher than
MUF, a path is not possible through F2.
Sun Set and Sun Rise time for the DX Station are indicated in the lower part of the graph
(DX) and represented by two orange lines while two blue lines indicate the end and the
beginning of the twilight. When the red dot is between a blue line and an orange line, the
absorption of the D layer is minimal while MUF is high and the propagation may momentarily
improve... Your own Sun Set and Sun Rise time are also indicated (Loc) and your twilight is
represented by two little blue squares making easy to see if a circuit along the terminator
(gray line) is possible.
The SFI text box (Solar Flux Index) lets you set up the program according to the solar
activity. You may obtain the SFI from a DX-Cluster (SH/WWV command) or on the Internet (
http://dx.qsl.net). If you are connected to the Internet, the sfi button updates this field
automatically from the NOAA server and displays the latest announcement in the status bar of
the program.
Notes
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