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C-Netz: Allow SDR using C-Netz without calibration options

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Crystals on SDRs are accurate enough for C-Netz (< 1ppm).
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Andreas Eversberg
2018-08-26 08:47:56 +02:00
parent 279dd25b15
commit eac19ddab1
2 changed files with 4 additions and 2 deletions
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docs/c-netz.html
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@@ -227,13 +227,15 @@ We need to calibrate the speed of our transmit signal (and receive signal as wel
<p>
<font color="red">Importaint: We need calibrate the signal processing clock!</font>
<br><br>
You can skip this parts, if you use SDR, because they have more accurate crystals than sound cards.
</p>
<p>
First of all we need a reference clock.
Since most computers have standard crystal clocks, we cannot use our system clock without any help.
I decided to use the help of the NTP daemon.
After running my system for several days (5 days), the clock speed was accurate enough for a base station.
After running my system for one up to 5 days, the clock speed was accurate enough for a base station.
Be sure to choose a place for your PC with constant temperature.
A room inside a building is sufficient.
</p>