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87 lines
4.0 KiB
Markdown
87 lines
4.0 KiB
Markdown
# HackRF #
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## Tuner Configurations ##
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SDRTrunk allows you to define multiple named tuner configurations per tuner
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type. A **Default** configuration is automatically created the first time you
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use each specific tuner type and will be recreated again if you accidentally
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delete or rename the **Default** configuration.
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Each time you plug your USB tuner into a new USB port, it will automatically
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use the **Default** tuner configuration. If you select a different named
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configuration, SDRTrunk will remember to use that named configuration each time
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you use the USB tuner in that specific USB port. If you create a named
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configuration for your tuner and subsequently move the tuner to a different
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USB port, simply select that named configuration from the drop-down list and it
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will store that port to named configuration setting.
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All changes to a named configuration are automatically saved.
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## Configuration ##
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* **Frequency** - sets the tuned frequency
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* **Config Tab** - controls for changing tuner configuration
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* **Info Tab** - displays information about the tuner
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### Configuration Tab ###
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* **Configuration Selection List** - selects a named configuration to use. Automatically applies the corresponding settings to the tuner
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* **Name** - tuner configuration name.
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* **Correction PPM** - correction value to align the currently tuned frequency with the frequency display values. Increasing the value causes the frequency display to move to the left and vice-versa.
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* **Sample Rate** - sampling rate of the tuner - corresponds to the visible/tunable bandwidth
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* **Gain - Amp** - turns the amplifier on/off
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* **Gain - LNA** - gain settings for the Low Noise Amplifier
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* **Gain - VGA** - gain settings for the Variable Gain Amplifier
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* **New** - creates a new named tuner configuration
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* **Delete** - deletes the currently listed tuner configuration
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### Info Tab ###
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The info tab displays information about the tuner:
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* **Serial** - serial number of the HackRF board.
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* **Part** - part number
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* **Firmware** - firmware revision
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## Using the HackRF ##
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One of the most important settings on the HackRF are the gain settings. The
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gain settings affect each portion of the radio spectrum differently, so you
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need to adjust the gain each time you move to a different part of the frequency
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spectrum.
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Strong nearby signals easily overload the HackRF. If the spectral display
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rises significantly, or if you notice the spectral display jumping up and down,
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this is an indication that you have overloaded the tuner. Another symptom of
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overload is spectral mirroring, where the left and right side look identical.
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Broadcast FM radio stations overload the tuner and you may or may not be able
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to set the gain low enough to visualize the entire FM band.
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Note: on startup if you have previously used a high sample rate, you may notice
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lagging/stalling in the application. Change the sample rate to a lower sample
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rate until the application stabilizes, and then select the desired sample rate.
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### Setting Gain ###
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* Set the frequency, or enable a channel and the tuner will automatically
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> adjust the frequency.
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* Turn the amplifier off and set LNA and VGA gain to 0.
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* Slowly adjust the LNA gain higher until you see the spectral display rise
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> significantly high or start to jump. Back off the gain setting until the
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> display settles down.
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* Repeat this step for the VGA gain setting.
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* Experiment with the Amp button to turn the amplifier on or off.
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If you have a strong nearby signal that is close in frequency to the channel
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that you want to decode, attempt to tune the strong signal up or down, so that
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it is no longer in the viewable passband of the tuner.
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## Updating Firmware ##
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The firmware label shown on the Info tab is the GIT revision label that was
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tagged against the software release. SDRTrunk does not currently support
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flashing the HackRF with new firmware. Use the HackRF tools to update the
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tuner. |