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iw2nke

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iw2nke
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  • I apologize for this long post, it is the last of this kind but I think it will be useful to someone else. As promised, I've encapsulated the Kiwi in a 14TE cassette from nVent Schroff after some CNC mechanical work to have the right hole as recomme…
  • Here some preliminary results. The measurement conditions are Kiwi running at 1 GHz, with 14 channels used to carry the IQ stream to a wsprdaemon client. The ambient temperature is 20° C, without any relevant airflow (artificial or natural). The b…
  • Following the instructions the output of make install is: make[1]: Entering directory '/root/Beagle_SDR_GPS' disable window system systemctl stop lightdm.service Failed to stop lightdm.service: Unit lightdm.service not loaded. make[1]: *** [Makefil…
  • The PWM frequency for the fan control is usually 25 kHz, so I share with you your concern about RFI. It is also true that the current for this control is less than 1 mA at 3.3 V. Let's look at the results ;)
  • Just to keep you updated, if interested. Now I am able to read the RPM (revolutions per minute) of the fan connecting the tachometer output at the pin 8.35. The reader, not optimized, is consuming less than 1.3 % of the CPU. Next step is to control …
  • Usually to run a fan at the max speed reduce the life and the MTBF. Moreover in our case the goal is to stay below a reference temperature. In winter with low temperatures probably the required forced airflow is significantly lower. Last point is th…
  • I am working on a self controlled fan cooler for the BBAI+kiwi. It is possible to assign through pin mux two unused pins of the cape/headers on the BB AI to manage PWM and to read RPM output, as GPIO in? After the review of the package I suppose th…