Observer Dialog Box
The Observer: The ground-based observer location (QTH, in amateur
radio jargon) is controlled by this dialog box, which appears when the Main
menu item is selected. The observer location is required for calculating
antenna azimuth, elevation, range, and doppler shift.
Observer locations may be selected from the
or may be entered directly from the keyboard, either as
latitude and longitude,
or as a
Maidenhead Grid Locator.
The observer location will be displayed on the map in the
with the callsign printed below and to the right of the map symbol.
Other Locations: Only one observer at a time may be selected, although
other locations may be displayed on the map. Provision is made for two lists
of other locations: Launch Sites (contained in the file LAUNCH.QTH), and
Special Sites (contained in the file SPECIAL.QTH). Display of either
or both of these two groups is controlled by the menu flags in the Map Window
Menu. The two groups may be used for any purpose, of course - the name "Launch
Sites" simply reflects my interest in knowing where the satellites come from.
For example, one list could represent ground control stations, and another a
list of stations you would like to contact (for mutual-visibility
determination). Special sites use the callsign to label the map symbol,
while Launch sites are labelled with their location.
- including file formats
Data Fields on the Form
Use the following buttons to accept or reject the changes made to the observer data:
OK (cr)- Accept values in all fields and return to tracking. The new observer location will be displayed immediately on all maps.
Cancel (esc)- Ignore any changes, retain the previous observer information and return to tracking.
Display and Window Overview
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