sdrangel/plugins/samplesource/fcdproplus/readme.md

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<h1>FunCube Dongle Pro+ input plugin</h1>
<h2>Introduction</h2>
This input sample source plugin gets its samples from a [FunCube Dongle (FCD) Pro+ device](http://www.funcubedongle.com/?page_id=1073).
<h2>Interface</h2>
![FCD Pro+ input plugin GUI](../../../doc/img/FCDProPlus_plugin.png)
<h3>1: Common stream parameters</h3>
![Remote source input stream GUI](../../../doc/img/RemoteInput_plugin_01.png)
<h4>1.1: Frequency</h4>
This is the center frequency of reception in kHz.
<h4>1.2: Start/Stop</h4>
Device start / stop button.
- Blue triangle icon: device is ready and can be started
- Green square icon: device is running and can be stopped
- Magenta (or pink) square icon: an error occurred. In the case the device was accidentally disconnected you may click on the icon, plug back in and start again.
<h4>1.4: Stream sample rate</h4>
Baseband I/Q sample rate in kS/s. This is the device sample rate (4) divided by the decimation factor (6).
<h3>2: Local Oscillator correction</h3>
This is the correction to be applied to the local oscillator in ppm.
<h3>3: Auto correction options</h3>
These buttons control the local DSP auto correction options:
- **DC**: auto remove DC component
- **IQ**: auto make I/Q balance. The DC correction must be enabled for this to be effective.
<h3>4: Decimated bandpass center frequency position relative the FCD Pro+ center frequency</h3>
- **Cen**: the decimation operation takes place around the FCD Pro+ center frequency Fs
- **Inf**: the decimation operation takes place around Fs - Fc.
- **Sup**: the decimation operation takes place around Fs + Fc.
With SR as the sample rate before decimation Fc is calculated as:
- if decimation n is 4 or lower: Fc = SR/2^(log2(n)-1). The device center frequency is on the side of the baseband. You need a RF filter bandwidth at least twice the baseband.
- if decimation n is 8 or higher: Fc = SR/n. The device center frequency is half the baseband away from the side of the baseband. You need a RF filter bandwidth at least 3 times the baseband.
<h3>5: Decimation factor</h3>
The I/Q stream from the FCD Pro+ ADC is downsampled by a power of two before being sent to the passband. Possible values are increasing powers of two: 1 (no decimation), 2, 4, 8, 16.
<h3>6: Transverter mode open dialog</h3>
This button opens a dialog to set the transverter mode frequency translation options. The details about this dialog can be found [here](../../../sdrgui/gui/transverterdialog.md)
<h3>7: LNA toggle</h3>
This checkbox is used to toggle the LNA on/off
<h3>8: Mix toggle</h3>
This checkbox is used to toggle mixer amplifier on/off
<h3>9: Bias tee</h3>
Use this checkbox to activate the bias tee.
<h3>10: If gain</h3>
Use this slider to adjust the gain of the IF amplifier.
<h3>10: RF filter</h3>
This controls the tuner filter (band) used:
<h3>11: IF filter</h2>
Selects the IF filter bandwidth