updated: 19 May 2011
The Master Calls window shows all calls in a Master log based on the characters entered in the callsign field of the QSO Window. For example, when the callsign field contains 'KK', all callsigns in the Master log starting with 'KK' will be shown. The use of a '?' (question mark) is allowed, for example, 'W?L' will find calls such as 'W3LPL', 'W9LZ', etc. When the callsign fields starts with a question mark, the letter combination can appear anywhere in the callsign. For example, '?KK' will find calls such as 'KK4HD' and 'AB4KK'.
Normally, lookup assumes you are typing the beginning of a call. You can change to a substring lookup by right-clicking on the MasterLookup window:
Here is an example showing a substring search for "U1I":
DX4WIN does not ship with a Master Log. These files are available from many sources, and a menu option is available to convert an ASCII text file containing callsigns, to the format used by DX4WIN.
If you want to use all the calls stored in your own log, export the calls to a text file:
The most popular master calls database is the Super Check Partial database maintained by Randy Thompson, K5ZD, for use by contest logging software. Download the .ZIP file and extract the desired .DTA file to your disk. Then follow the conversion process below.
There is no straightforward way to convert/merge more than one master callsign database. However, Alex Shovkoplyas, VE3NEA, has written a program called MEdit which allows you to edit, import and export callsigns in a master database.