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Updated Capture (markdown)

Si 2022-02-27 18:48:06 +00:00
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Capture.md

@ -5,7 +5,7 @@ The Sampling rate used may not be supported by some MicroSD cards, it is best to
The Key Items on the App that can be selected with the cursor and changed with the encoder knob are:
* **Title bar:** The usual Items may be changed and displayed.
* **Frequency:** The setting of the frequency using the keypad can be completed
* **Frequency:** The setting of the frequency using the keypad can be completed and is stored in persistant memory so can be returned to when the App is used again.
* **Step Size:** The selected step size of frequency adjustment carried out by the Rotary encoder.
* **Gain:** Amp (0dB or 14dB), LNA(IF) (0-40),VGA(Baseband)(0-62)
* **Rate:** The sample rate, which by its nature set the set bandwidth of capture. This is shown in the markers around the centre line of the waterfall display. The sample rate is variable from 8k5 to 2750K in 13 steps. You need to ensure that the sample rate is more than twice the bandwidth of the signal you want to capture see [(Nyquist Principle / also called Shannon’s Law) ](https://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem)