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Observer Dialog Data Fields

Filename - Name and path of the most-recently-read .QTH file on disk. This file will be automatically loaded at startup if Setup:Save Settings is chosen in the Main Window . This field changes automatically after File:Open .
Call Sign (alt-C) - Locations are indexed in the file by ITU radio call-sign prefixes (familiar to Amateur Radio operators). A prefix or call may be selected from the list, or a new one typed in. Part of the location text is also shown in the list as a memory aid. Non-amateur-radio users could replace the callsigns with 3-character airport city identifiers (LAX, ORD, etc.).
Location/QTH, Description (alt-Q, alt-D) - Two text fields describing the observer location. Type in notes of your choice (no commas, please).
Grid Locator (alt-G) - A 6-character identifier (the Maidenhead Grid Locator or grid square) locating a 2.5 x 5 minute "square" containing the specified latitude and longitude. This system is commonly used by Amateur Radio operators to identify their locations. Entering a valid grid locator in this field will automatically compute the latitude and longitude for the center of the grid square.
L atitude, Longitude (alt-a, alt-n) - Observer coordinates from file, or entered manually. For South latitude, or East longitude, use negative numbers. May be in decimal format or hours, minutes, seconds. Latitude should be between -90 (south pole) and +90 (north pole). Longitude should be between +180 and -180. Longitudes in the range +360 to -360 will be accepted and converted. The correct grid square identifier is automatically calculated.
Al titude (alt-t) - Observer location in meters above mean sea level.
Horizon Elevation (alt-E) - Minimum antenna elevation. Used to determine when a satellite will be "visible" from this location.
Geodetic Model (alt-M) - Select a spherical earth model (for faster calculation) or elliptical earth (for slightly better accuracy, particularly in range calculations). Antenna T ype (alt-y) - Select one of four types for the observer's antenna: isotropic, steerable, groundplane, or turnstile. This information is used to calculate the pattern loss.

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