docs: rename FAQ to Troubleshooting
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Getting Help
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============
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Before asking for help with HackRF, check to see if your question is answered in this documentation, listed in the :ref:`FAQ <faq>`, or addressed in the `HackRF GitHub repository issues <https://github.com/greatscottgadgets/hackrf/issues>`__.
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Before asking for help with HackRF, check to see if your question is answered in this documentation, listed in the :ref:`Troubleshooting <troubleshooting>` page, or addressed in the `HackRF GitHub repository issues <https://github.com/greatscottgadgets/hackrf/issues>`__.
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For assistance with HackRF general use or development, please look at the `issues on the GitHub project <https://github.com/greatscottgadgets/hackrf/issues>`__. This is the preferred place to ask questions so that others may locate the answer to your question in the future.
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@ -7,7 +7,7 @@ Welcome to HackRF's documentation!
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:caption: User Documentation
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getting_help
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faq
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troubleshooting
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synchronization_checklist
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hackrf_projects_mentions
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.. _faq:
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.. _troubleshooting:
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================================================
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FAQ
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Troubleshooting
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================================================
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.. _bigspike:
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What is the big spike in the center of my received spectrum?
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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There is a big spike in the center of the received spectrum
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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If you see a large spike in the center of your FFT display regardless of the frequenecy you are tuned to, you are seeing a DC offset (or component or bias). The term "DC" comes from "Direct Current" in electronics. It is the unchanging aspect of a signal as opposed to the "alternating" part of the signal (AC) that changes over time. Take, for example, the signal represented by the digital sequence:
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@ -23,16 +23,10 @@ There was a bug in the HackRF firmware (through release 2013.06.1) that made the
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A high DC offset is also one of a few symptoms that can be caused by a software version mismatch. A common problem is that people run an old version of gr-osmosdr with newer firmware.
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Solution
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--------
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----
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How do I deal with the big spike in the middle of my spectrum?
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Start by reading :ref:`our FAQ Response on the DC Spike <bigspike>`. After that, there are a few options:
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There are a few options:
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#. Ignore it. For many applications it isn't a problem. You'll learn to ignore it.
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