kopia lustrzana https://github.com/f4exb/sdrangel
86 wiersze
3.0 KiB
Markdown
86 wiersze
3.0 KiB
Markdown
<h1>FunCube Dongle Pro+ input plugin</h1>
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<h2>Introduction</h2>
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This input sample source plugin gets its samples from a [FunCube Dongle (FCD) Pro+ device](http://www.funcubedongle.com/?page_id=1073).
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<h2>Interface</h2>
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The top and bottom bars of the device window are described [here](../../../sdrgui/device/readme.md)
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<h3>1: Common stream parameters</h3>
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<h4>1.1: Frequency</h4>
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This is the center frequency of reception in kHz.
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<h4>1.2: Start/Stop</h4>
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Device start / stop button.
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- Blue triangle icon: device is ready and can be started
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- Green square icon: device is running and can be stopped
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- 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.
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<h4>1.4: Stream sample rate</h4>
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Baseband I/Q sample rate in kS/s. This is the device sample rate (4) divided by the decimation factor (6).
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<h3>2: Local Oscillator correction</h3>
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This is the correction to be applied to the local oscillator in ppm.
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<h3>3: Auto correction options</h3>
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These buttons control the local DSP auto correction options:
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- **DC**: auto remove DC component
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- **IQ**: auto make I/Q balance. The DC correction must be enabled for this to be effective.
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<h3>4: Decimated bandpass center frequency position relative to the FCD Pro+ center frequency</h3>
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- **Cen**: the decimation operation takes place around the FCD Pro+ center frequency Fs
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- **Inf**: the decimation operation takes place around Fs - Fc.
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- **Sup**: the decimation operation takes place around Fs + Fc.
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With SR as the sample rate before decimation Fc is calculated as:
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- 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.
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- 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.
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<h3>5: Decimation factor</h3>
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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.
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<h3>6: Transverter mode open dialog</h3>
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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)
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<h3>7: LNA toggle</h3>
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This checkbox is used to toggle the LNA on/off
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<h3>8: Mix toggle</h3>
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This checkbox is used to toggle mixer amplifier on/off
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<h3>9: Bias tee</h3>
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Use this checkbox to activate the bias tee.
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<h3>10: If gain</h3>
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Use this slider to adjust the gain of the IF amplifier.
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<h3>10: RF filter</h3>
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This controls the tuner filter (band) used:
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<h3>11: IF filter</h2>
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Selects the IF filter bandwidth
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