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

Crystals on SDRs are accurate enough for C-Netz (< 1ppm).
pull/1/head
Andreas Eversberg 4 years ago
parent 279dd25b15
commit eac19ddab1
  1. 4
      docs/c-netz.html
  2. 2
      src/cnetz/main.c

@ -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>

@ -446,7 +446,7 @@ int main(int argc, char *argv[])
exit(0);
}
if (!set_clock_speed && !measure_speed) {
if (!set_clock_speed && !measure_speed && !use_sdr) {
printf("No clock speed given. You need to measure clock using '-M' and later correct clock using '-S <rx ppm>,<tx ppm>'. See documentation for help!\n\n");
mandatory = 1;
}

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