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< h1 > AM modulator plugin< / h1 >
< h2 > Introduction< / h2 >
This plugin can be used to generate a narrowband amplitude modulated signal. "Narrowband" means that the bandwidth can vary from 1 to 40 kHz.
< h2 > Interface< / h2 >
![AM Modulator plugin GUI ](../../../doc/img/AMMod_plugin.png )
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< h3 > 1: < s > Frequency shift from center frequency of reception direction< / s > < / h3 >
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The "+/-" button on the left side of the dial toggles between positive and negative shift.
< h3 > 2: Frequency shift from center frequency of reception value< / h3 >
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Use the wheels to adjust the frequency shift in Hz from the center frequency of reception. Pressing shift simultanoeusly moves digit by 5 and pressing control moves it by 2.
Left click on a digit sets the cursor position at this digit. Right click on a digit sets all digits on the right to zero. This effectively floors value at the digit position.
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< h3 > 3: Channel power< / h3 >
Average total power in dB relative to a +/- 1.0 amplitude signal generated in the pass band.
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< h3 > 4: Channel mute< / h3 >
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Use this button to toggle mute for this channel.
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< h3 > 5: RF bandwidth< / h3 >
This is the bandwidth in kHz of the channel signal filtered after modulation. It can be set continuously in 1 kHz steps from 1 to 40 kHz.
< h3 > 6: Modulation level< / h3 >
Adjusts the AM modulation level in %
< h3 > 7: Volume< / h3 >
This is the volume of the audio signal from 0.0 (mute) to 2.0 (maximum). It can be varied continuously in 0.1 steps using the dial button.
< h3 > 8: Level meter in %< / h3 >
- top bar (beige): average value
- bottom bar (brown): instantaneous peak value
- tip vertical bar (bright red): peak hold value
You should aim at keepimg the peak value below 100% using the volume control
< h3 > 9: Input source control< / h3 >
![Modulator input source control GUI ](../../../doc/img/ModControls.png )
< h4 > 9.1: Tone input select< / h4 >
Switches to the tone input. You must switch it off to make other inputs available.
< h4 > 9.2: Morse keyer input select< / h4 >
Switches to the Morse keyer input. You must switch it off to make other inputs available.
< h4 > 9.3: Tone frequency (kHz)< / h4 >
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Adjusts the tone frequency from 0.1 to 2.5 kHz in 0.01 kHz steps
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< h4 > 9.4: Audio input select< / h4 >
Switches to the audio input. You must switch it off to make other inputs available.
< h3 > 10: CW (Morse) text< / h3 >
Enter the text to be keyed when Morse input is active and in text mode
< h3 > 11: Clear CW text< / h3 >
Clears the CW (Morse) text
< h3 > 12: Morse keyer controls< / h3 >
![Morse keyer control GUI ](../../../doc/img/ModCWControls.png )
< h4 > 12.1: CW keying speed< / h4 >
Sets the CW speed in Words Per Minute (WPM). This is based on the word "PARIS" sent 5 times. For 5 WPM the dot length is 240 ms. In other terms the dot length is calculated as 1.2 / WPM seconds. The dot length is used as the base to compute other timings:
- Element (dot or dash) silence separator: 1 dot length
- Dash: 3 dot lengths
- Character silence separator: 3 dot lengths
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- Word silence separator: 7 dot lengths
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< h4 > 12.2: Dots keying< / h4 >
Switch this button to send dots continuously
< h4 > 12.3: Dashes keying< / h4 >
Switch this button to send dashes continuously
< h4 > 12.4: Text keying< / h4 >
Switch this button to send the text typed into the text box (10)
< h4 > 12.5: Text auto repeat< / h4 >
Switch this button to auto repeat the text keying
< h4 > 12.6: Text play/stop< / h4 >
Use this button to stop sending text. When resuming keying restarts at the start of text
< h3 > 13: Audio file path< / h3 >
The path to the selected audio file to be played or dots if unselected
< h3 > 14: Audio file play controls< / h3 >
![Modulator audio file play control GUI ](../../../doc/img/ModFileControls.png )
< h4 > 14.1: Audio file select< / h4 >
Opens a file dialog to select the audio file to be played. It must be mono 48 kHz 16LE raw format.
< h4 > 14.2: Audio file loop< / h4 >
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Audio replay file at the end
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< h4 > 14.3: Play/pause file play< / h4 >
Toggle play/pause file play. When paused the slider below (17) can be used to randomly set the position in the file when re-starting.
< h3 > 15: Play file current position< / h3 >
This is the current audio file play position in time units relative to the start
< h3 > 16: Play file length< / h3 >
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This is the audio file play length in time units
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< h3 > 17: Play file position slider< / h3 >
This slider can be used to randomly set the currennt position in the file when file play is in pause state (button 14.3)