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This commit is contained in:
Andreas Eversberg
2017-10-03 10:48:50 +02:00
parent 91b48c09de
commit 7cbebaeb75
12 changed files with 95 additions and 7 deletions
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6
docs/sdr.html
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@@ -107,8 +107,8 @@ You will get an ASCII art plot of received IQ data.
Press 'q' again and you will get a logarithmic view of IQ vectors.
Press 'q' again to turn off this view.
Please monitor this view when the phone tries to call or register.
If the dots are yellow or red, the received signal overdrives the ADC.
If the linear view shows not a nice, skinny circle, if the phone transmits, the input of your SDR might be saturated.
If the dots are yellow, or red, the received signal may overdrive the ADC.
Especially when the linear view shows a deformed circle (or even rectangle), reduce RX level.
</p>
<center><img src="display-spectrum.png"/></center>
@@ -116,7 +116,7 @@ If the linear view shows not a nice, skinny circle, if the phone transmits, the
<p>
Press 's' to get an ASCII art graph of received frequency spectrum.
The spectrum's bandwidth is defined by the sample rate (-s) and not by the SDR sample rate!
If you don't get this nice peak, but maybe several peaks, you might have the input over-driven.
If you don't get nice peaks, but maybe several peaks, you might over-driven the input.
Note that the peak will spread by the frequency deviation, so the peak might look noisy on the top.
If the peak is quite low, check the input gain.
</p>