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sdrangel/plugins/channeltx/modwfm/readme.md

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<h1>WFM modulator plugin</h1>
<h2>Introduction</h2>
This plugin can be used to generate a wideband frequency modulated signal. "Wideband" means that the bandwidth can vary from 12.5 to 250 kHz.
<h2>Interface</h2>
![WFM Modulator plugin GUI](../../../doc/img/WFMMod_plugin.png)
<h3>1: Frequency shift from center frequency of reception direction</h3>
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>
Use the wheels to adjust the frequency shift in Hz from the center frequency of reception. 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.
<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 in discrete values: 12.5, 25, 40, 60, 75, 80, 100, 125, 140, 160, 180, 200, 220 and 250 kHz
<h3>6: Audio frequency bandwidth</h3>
This is the bandwidth in khz of the modulating signal filtered before modulation. It can be set in kHz steps from 1 to 20 kHz
<h3>7: Frequency deviation</h3>
Adjusts the frequency deviation in 1 kHz steps from 0 to 100 kHz
<h3>8: 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>9: 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>10: Input source control</h3>
![Modulator input source control GUI](../../../doc/img/ModControls.png)
<h4>10.1: Tone input select</h4>
Switches to the tone input. You must switch it off to make other inputs available.
<h4>10.2: Morse keyer input select</h4>
Switches to the Morse keyer input. You must switch it off to make other inputs available.
<h4>10.3: 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>10.4: Audio input select</h4>
Switches to the audio input. You must switch it off to make other inputs available.
<h3>11: CW (Morse) text</h3>
Enter the text to be keyed when Morse input is active and in text mode
<h3>12: Clear CW text</h3>
Clears the CW (Morse) text
<h3>13: Morse keyer controls</h3>
![Morse keyer control GUI](../../../doc/img/ModCWControls.png)
<h4>13.1: 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>13.2: Dots keying</h4>
Switch this button to send dots continuously
<h4>13.3: Dashes keying</h4>
Switch this button to send dashes continuously
<h4>13.4: Text keying</h4>
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Switch this button to send the text typed into the text box (11)
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<h4>13.5: Text auto repeat</h4>
Switch this button to auto repeat the text keying
<h4>13.6: Text play/stop</h4>
Use this button to stop sending text. When resuming keying restarts at the start of text
<h3>14: Audio file path</h3>
The path to the selected audio file to be played or dots if unselected
<h3>15: Audio file play controls</h3>
![Modulator audio file play control GUI](../../../doc/img/ModFileControls.png)
<h4>15.1: 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>15.2: Audio file loop</h4>
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Audio replay file at the end
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<h4>15.3: Play/pause file play</h4>
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Toggle play/pause file play. When paused the slider below (18) can be used to randomly set the position in the file when re-starting.
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<h3>16: Play file current position</h3>
This is the current audio file play position in time units relative to the start
<h3>17: Play file length</h3>
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This is the audio file play length in time units
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<h3>18: Play file position slider</h3>
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This slider can be used to randomly set the currennt position in the file when file play is in pause state (button 15.3)