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QSO Generator\Callsigns Ctrl+C


The callsign generator generates the callsigns used in NuMorse Pro QSOs and also when the code source is switched to “callsigns”. By default, US callsigns are produced according to the FCC rules.


In NuMorse Pro call signs are generated using a “decision tree”. This is displayed here as a tree on its side with the trunk at the left and the smallest branches to the right.  This control panel allows editing of the callsign decision tree. You could edit the tree to produce callsigns from other countries or to reflect changes in FCC callsign allocation rules.


To generate a callsign the program starts at the left (at the “root”) and travels along branches collecting letters and numbers at each branch point until it reaches a branch tip at the right of the diagram. The possible characters collected at each point are also shown on the diagram. You alter the tree by adding or removing branches and specifying the characters to be collected at each branch point.


The callsign control panel controls:


Generate character editor.

To alter a branch point (also called a “node”) it must first be selected by left-clicking on it. This single-line editor allows the characters that may be collected in the callsign at each branch point to be specified. Use the comma as a separator and the dash (-) to specify ranges of letters or numbers. Lower case letters are ignored which allows annotations to be made to the tree diagram.


A-Z button

Specifies that the node should generate letters A to Z.


0-9 button

Specifies that the node should generate numbers 0 to 9.


Test button

This generates a callsign in “slow motion” so you can see it being built up character by character on the tree diagram.


Test results display

When you click on the test button the resulting callsign is displayed here.


Delete button

Deletes the currently selected node. Use with care, changes are permanent.


New button

Add a new node.


Node activity level group

Provides a way to specify how branching is to take place at a node.


Use at random

The normal type of node where each path has equal chance of being followed.

Always use

Branching will always be though this node from the previous one.

Never use

Equivalent to deleting the node and any following branches except that this is not permanent and the branch can be restored to normal.


Allow callsign upgrades


This causes some callsigns to use the USA license upgrade indicator. This is a temporary designator appended to a callsign that indicates that the operator has operating privileges of a higher class callsign. For example, a general class callsign followed by /AE indicates that the operator has Extra Class privileges but is temporarily using a General Class callsign until  the Extra Class callsign is allocated.