### Getting Started with Propagation Prediction

To generate a propagation forecast for a QSO between your QTH and a DX location,

select the

**Parameters**tab in PropView's Main windowin the

**Conditions**panelset the forecast

**Date**(this textbox will aready be set to the current date)type the current solar flux into the

**SFI**textbox; if you are running SpotCollector, the textbox will already contain the solar flux from the most recent WWV spotleave the

**Avail %**textbox set to 10

in the

**Transmitter**paneltype your QTH's latitude and longitude into the

**Latitude**and**Longitude**textboxes (e.g. 42 22' N and 98 45' W); if you are running DXView, these textboxes will already contain your QTH's locationleave the

**TakeOff**textbox set to 3type your transmitter power (in watts) into the

**Power**textboxselect either a

**Short**or**Long**path forecast

in the

**Receiver**paneltype the DX location's latitude and longitude into the

**Latitude**and**Longitude**textboxes (e.g. 40 15' S and 150 12' E); if you are running DXView, these textboxes will already contain the selected location's latitude and longitudeselect the

**Man-made noise level**like to be experienced by the DX station; for an optimistic forecast, choose**Remote**

click the

**Predict**button; PropView will compute a forecast, and produce a graphical display on the Main window's**Prediction**tab

#### Interpreting a PropView forecast graph

After generating a prediction for propagation between two locations, check the **Prediction** tab's **Show Critical Frequencies** box and uncheck its **Show Open Bands** box.

PropView's forecasts are depicted on a graph of frequency (vertical access) vs. UTC time (horizontal axis).

The **black** curve represents the lowest useable frequency (**LUF**) as a function of time. Any frequency lower than the black curve will not support communications due to absorption.

The **blue**, **green**, and **red curves** provide a statistical range for the maximum useable frequency (**MUF**) as a function of time. The actual MUF will be at or above the blue curve with 90% confidence, at or above the green curve with 50% confidence, and at or above the red curve with 10% confidence. Any frequency above the actual MUF will not support communications, due to insufficient reflection.

At any specified time, you can identify which frequencies will likely support communication between your QTH and the DX location: they are bounded on the low-end by the black curve, and on the high-end by the statistical range between the blue and red curves. You can use the green curve as a kind of *expected MUF* curve; if you're an optimist, use the red curve for this purpose.

To make it easier to see what ham bands are open when, uncheck the **Show Critical Frequencies** box and check the **Show Open Bands** box. PropView will display horizontal lines representing ham bands lying between the LUF and statistical MUF; the thickness of these horizontal lines conveys the likelihood of an opening: the thickest lines indicates openings based on the 90% confidence MUF (the blue curve), and the thinnest lines indicate openings based on the 10% confidence MUF (the red curve).

If you now check the **Show Critical Frequencies **box, the relationship between the horizontal lines and the critical frequency curves should be apparent.

Below the forecast graph's labeled time axis, two multicolored horizontal bars labelled **Xmitter** and **Rcvr** show daytime (yellow), twilight (gray), and nightime (black) conditions at your QTH and the DX location respectively.