This intput sample source plugin gets its samples from a [HackRF device](https://greatscottgadgets.com/hackrf/).
<h2>Build</h2>
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.
The HackRF Host library is also provided by many Linux distributions and is built in the SDRangel binary releases.
If you have the Tx open in another tab and it is running then it will be stopped automatically before the Rx starts. In a similar manner the Rx will be stopped before the Tx is started from the Tx tab.
Use this button to toggle the device Tx frequency link.
When active (button lit) and a tab is opened for the Tx part of the same device this option will activate the link of the Tx frequency to the Rx frequency. Thus when changing the Rx frequency the Tx frequency will vary by the same amount. This facilitates the split operation or repeater operation. You can also set the Tx frequency so that it follows exactly the Rx frequency (simplex).
The amount of shift is simply set by changing the frequency in the Tx tab.
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. Wheels are moved with the mousewheel while pointing at the wheel or by selecting the wheel with the left mouse click and using the keyboard arroews. Pressing shift simultanoeusly moves digit by 5 and pressing control moves it by 2.
