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Updated FAQ (markdown)

Michael Ossmann
2013-07-03 21:34:55 -07:00
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FAQ.md

@@ -34,6 +34,12 @@ Follow the instructions to [update your firmware](https://github.com/mossmann/ha
## What is this big spike in the center of my received spectrum?
### Q:
I see a large spike in the center of my FFT display regardless of the frequency my HackRF is tuned to. Is there something wrong with my HackRF?
### A:
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:
```
-2, -1, 1, 6, 8, 9, 8, 6, 1, -1, -2, -1, 1, 6, 8, 9, 8, 6, 1, -1, -2, -1, 1, 6, 8, 9, 8, 6, 1, -1