I decided this weekend since I had the time I was going to learn how to do it.
I wanted to code something simple yet useful to amateur radio as I want to start writing applications for the Blackberry smartphones.
This version of the dipole calculator is not written for the Blackberry however as it uses a different JDK and you have to pay $20 to get a certificate key so you can use the locked portions of the JDK. I'm not quite ready to shell out the $20 if I can't even get the JDK to work with Netbeans.
Anyway, the link to the free software is to the left in the sidebar.
Here is the source code:
(Netbeans IDE creates most of the code, I wrote only a few lines which are highlighted in bold text)
import java.text.NumberFormat;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
* DiPoleGUI.java
*
* Created on Feb 28, 2010, 6:41:19 AM
*/
/**
*
* @author Tim
*/
public class DiPoleGUI extends javax.swing.JFrame {
double frequency = 0, wire_length = 0;
/** Creates new form DiPoleGUI */
public DiPoleGUI() {
initComponents();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
//
private void initComponents() {
ButtonCalculate = new javax.swing.JButton();
Reset = new javax.swing.JButton();
DataInputMHz = new javax.swing.JFormattedTextField();
DataInputLength = new javax.swing.JFormattedTextField();
Frequency1 = new javax.swing.JLabel();
jLabel1 = new javax.swing.JLabel();
ResultHalfLength = new javax.swing.JFormattedTextField();
jSeparator1 = new javax.swing.JSeparator();
jSeparator2 = new javax.swing.JSeparator();
ResultHalfLength1 = new javax.swing.JFormattedTextField();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jLabel4 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Dipole Calculator");
ButtonCalculate.setText("Calculate");
ButtonCalculate.setPreferredSize(new java.awt.Dimension(77, 23));
ButtonCalculate.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ButtonCalculateActionPerformed(evt);
}
});
Reset.setText("Reset");
Reset.setPreferredSize(new java.awt.Dimension(61, 23));
Reset.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ResetActionPerformed(evt);
}
});
DataInputMHz.setText("0");
DataInputMHz.setPreferredSize(new java.awt.Dimension(12, 20));
DataInputMHz.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(java.awt.event.FocusEvent evt) {
DataInputMHzFocusGained(evt);
}
});
DataInputLength.setText("0");
DataInputLength.setPreferredSize(new java.awt.Dimension(12, 20));
DataInputLength.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
DataInputLengthActionPerformed(evt);
}
});
DataInputLength.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(java.awt.event.FocusEvent evt) {
DataInputLengthFocusGained(evt);
}
});
Frequency1.setText("Frequency");
jLabel1.setText("Overall Length");
ResultHalfLength.setBackground(new java.awt.Color(153, 153, 153));
ResultHalfLength.setEditable(false);
ResultHalfLength.setPreferredSize(new java.awt.Dimension(109, 20));
jSeparator1.setForeground(new java.awt.Color(0, 0, 204));
jSeparator2.setForeground(new java.awt.Color(0, 0, 204));
ResultHalfLength1.setBackground(new java.awt.Color(153, 153, 153));
ResultHalfLength1.setEditable(false);
ResultHalfLength1.setPreferredSize(new java.awt.Dimension(109, 20));
ResultHalfLength1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ResultHalfLength1ActionPerformed(evt);
}
});
jLabel2.setText("Feet");
jLabel3.setText("MHz");
jTextArea1.setColumns(20);
jTextArea1.setEditable(false);
jTextArea1.setFont(new java.awt.Font("Arial Black", 0, 13)); // NOI18N
jTextArea1.setLineWrap(true);
jTextArea1.setRows(5);
jTextArea1.setText("Enter the resonant frequency in MHz or the overall antenna wire length and press the calculate button to calculate the missing value.");
jScrollPane1.setViewportView(jTextArea1);
jLabel4.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jLabel4.setText("DIPOLE CALCULATOR By AJ4UU");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(194, 194, 194)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(Reset, javax.swing.GroupLayout.Alignment.CENTER, javax.swing.GroupLayout.PREFERRED_SIZE, 109, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(ButtonCalculate, javax.swing.GroupLayout.Alignment.CENTER, javax.swing.GroupLayout.PREFERRED_SIZE, 109, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addGap(10, 10, 10)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
.addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 239, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(ResultHalfLength1, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jSeparator2, javax.swing.GroupLayout.PREFERRED_SIZE, 239, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(95, 95, 95)
.addComponent(ResultHalfLength, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addGroup(layout.createSequentialGroup()
.addGap(28, 28, 28)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
.addComponent(jLabel4)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 441, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(161, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(Frequency1, javax.swing.GroupLayout.PREFERRED_SIZE, 90, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(DataInputMHz, javax.swing.GroupLayout.PREFERRED_SIZE, 53, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(DataInputLength, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 112, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(123, 123, 123))
);
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {ButtonCalculate, Reset});
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel4)
.addGap(18, 18, 18)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 19, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(DataInputLength, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(Frequency1)
.addComponent(jLabel1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(DataInputMHz, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3))))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(ButtonCalculate, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(Reset, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(ResultHalfLength1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(ResultHalfLength, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jSeparator2, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))))
);
pack();
}//
private void ButtonCalculateActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
//double frequency, wire_length;
frequency = Double.parseDouble(DataInputMHz.getText());
wire_length = Double.parseDouble(DataInputLength.getText());
if (wire_length == 0) {
wire_length = 468 / frequency;
DataInputLength.setValue(wire_length);
} else if (frequency == 0) {
frequency = 468 / wire_length;
DataInputMHz.setValue(frequency);
}
ResultHalfLength.setValue(wire_length / 2);
ResultHalfLength1.setValue(wire_length / 2);
}
private void ResetActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
DataInputMHz.setText("0");
DataInputLength.setText("0");
ResultHalfLength.setText(null);
ResultHalfLength1.setText(null);
wire_length = frequency = 0;
}
private void DataInputMHzFocusGained(java.awt.event.FocusEvent evt) {
// TODO add your handling code here:
DataInputMHz.setText(null);
DataInputLength.setText("0");
}
private void DataInputLengthFocusGained(java.awt.event.FocusEvent evt) {
// TODO add your handling code here:
DataInputLength.setText(null);
DataInputMHz.setText("0");
}
private void ResultHalfLength1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void DataInputLengthActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new DiPoleGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton ButtonCalculate;
private javax.swing.JFormattedTextField DataInputLength;
private javax.swing.JFormattedTextField DataInputMHz;
private javax.swing.JLabel Frequency1;
private javax.swing.JButton Reset;
private javax.swing.JFormattedTextField ResultHalfLength;
private javax.swing.JFormattedTextField ResultHalfLength1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JSeparator jSeparator1;
private javax.swing.JSeparator jSeparator2;
private javax.swing.JTextArea jTextArea1;
// End of variables declaration
}
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