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81 lines
3.8 KiB
Markdown
81 lines
3.8 KiB
Markdown
<h1>HackRF output plugin</h1>
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<h2>Introduction</h2>
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This output sample sink plugin sends its samples to a [HackRF device](https://greatscottgadgets.com/hackrf/).
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<h2>Build</h2>
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The plugin will be built only if the [HackRF host library](https://github.com/mossmann/hackrf) is installed in your system. If you build it from source and install it in a custom location say: `/opt/install/libhackrf` you will have to add `-DLIBHACKRF_INCLUDE_DIR=/opt/install/libhackrf/include -DLIBHACKRF_LIBRARIES=/opt/install/libhackrf/lib/libhackrf.so` to the cmake command line.
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The HackRF Host library is also provided by many Linux distributions and is built in the SDRangel binary releases.
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<h2>Interface</h2>
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<h3>1: Start/Stop</h3>
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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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- Red square icon: device is running and can be stopped
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- Magenta (or pink) square icon: an error occured. In the case the device was accidentally disconnected you may click on the icon, plug back in and start again.
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Please note that HackRF is a half duplex device so if you have the Rx open in another tab you have to stop it first before starting the Tx for it to work properly. In a similar manner you should stop the Tx before resuming the Rx.
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The settings on Tx or Rx tab are reapplied on start so provided the half duplex is handled correctly as stated above these settings can be considered independent.
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<h3>2: Baseband sample rate</h3>
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This is the baseband sample rate in kS/s before interpolation (5) to produce the final stream that is sent to the HackRF device. Thus this is the device sample rate (8) divided by the interpolation factor (5).
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<h3>3: Frequency</h3>
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This is the center frequency of transmission in kHz.
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<h3>4: Local Oscillator correction</h3>
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Use this slider to adjust LO correction in ppm. It can be varied from -10.0 to 10.0 in 0.1 steps and is applied in software.
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<h3>5: Interpolation factor</h3>
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The baseband stream is interpolated by this value before being sent to the HackRF device. Possible values are:
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- **1**: no interpolation
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- **2**: multiply baseband stream sample rate by 2
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- **4**: multiply baseband stream sample rate by 4
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- **8**: multiply baseband stream sample rate by 8
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- **16**: multiply baseband stream sample rate by 16
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- **32**: multiply baseband stream sample rate by 32
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The main samples buffer is based on the baseband sample rate and will introduce ~500ms delay for interpolation by 16 or lower and ~1s for interpolation by 32.
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<h3>6: Bias tee</h3>
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Use this checkbox to toggle the +5V power supply on the antenna connector.
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<h3>7:RF amp</h3>
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Use this checkbox to toggle the output amplifier (PA). This PA gives an additional gain of 14 dB.
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According to HackRF documentation the output power when the PA is engaged and the Tx VGA (10) is at full power (47dB) is the following:
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- 10 MHz to 2150 MHz: 5 dBm to 15 dBm, generally increasing as frequency decreases
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- 2150 MHz to 2750 MHz: 13 dBm to 15 dBm
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- 2750 MHz to 4000 MHz: 0 dBm to 5 dBm, increasing as frequency decreases
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- 4000 MHz to 6000 MHz: -10 dBm to 0 dBm, generally increasing as frequency decreases
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<h3>8: Device sample rate</h3>
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This is the HackRF device DAC sample rate in S/s.
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Use the wheels to adjust the sample rate. 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>9: Tx filter bandwidth</h3>
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This is the Tx filter bandwidth in kHz. Possible values are: 1750, 2500, 3500, 5000, 5500, 6000, 7000, 8000, 9000, 10000, 12000, 14000, 15000, 20000, 24000, 28000 kHz.
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<h3>10: Tx variable gain amplifier gain</h3>
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The Tx VGA gain can be adjusted from 0 dB to 47 dB in 1 dB steps. See (7) for an indication on maximum output power. |