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  • wiedehopf
    replied
    so you use the vacuum every 2 years to remove the dust ... big deal.

    Leave a comment:


  • magnum
    replied
    Based on the specs the Pi throttles if the temperature reaches a maximum.

    I am using a Pi 3 B with small heat sinks in a case. With four different feeders the CPU utilization is below 15% and the CPU is running constantly on 600 MHz. Temperature stable at 55-58

    Leave a comment:


  • Dutchyb
    replied
    Sorry for the delay in replying.


    I have been searching the internet and there are many different opinions about the heat sinks. Some say that it is necessary because the pi will slow down. Some say that there are not so good/bad heat sinks. So good advice seems to be hard to get. There even some people telling that the "clue" used for the cheap heat sink, might even cause higher temperatures.

    I agree with you that using the Pi open it will get a lot of dirt and dust.
    So if you have an idea about which one will do please tell me

    Leave a comment:


  • magnum
    replied
    Tests of heat sinks have shown that they can bring the temp down by 5-10
    Leaving the case open can cause problems with dust and dirt

    Leave a comment:


  • Dutchyb
    replied
    Ok that might be an idea. I do not have heat sinks for my P 3b+. Will check for them

    Leave a comment:


  • magnum
    replied
    I am using a P3 B in a normal environment (25). The CPU shows a temperature of 55-58 inside the case. Removing the cover brings it down to 48-50
    I do not use an active fan, only the heat sink

    Leave a comment:


  • Dutchyb
    replied
    As always , thank you for the feedback. will put the dongle on a "metal" .

    My Pi is in a case indeed. Will check temperature without a case as well.

    Leave a comment:


  • wiedehopf
    replied
    Such electronics can run fine at quite high temperatures for a long time.

    The failures you read about may not be connected to temperature.

    Anyway as your RPi is also throttling due to heat, the location seems to be quite hot.
    A case on the RPi will also make it produce more heat and transfer some of that heat via the USB port.

    So frankly either you don't worry about it, or you do something about it.
    What do you think is an acceptable failure rate for these devices for example, maybe it's lower when they run cooler.
    But the question, is it unacceptable when some of them run a little hotter, probably not.

    Still if you are unlucky, you'll have to get a new one. Or a different product there are other models rtl-sdr compatible receivers available.

    And as i already said, a plastic case and a metal case feel completely different while the electronics on the inside might be just as hot.
    Just not as noticeable.

    Leave a comment:


  • magnum
    replied
    I am using the blue FR pro plus stick, equipment is located in my home office under the roof
    Even with that hot weeks the stick is getting hand warm (outside surface) with a good traffic to be tracked over the day (approx 3500 aircrafts per day in average)

    Leave a comment:


  • abcd567
    replied
    glennblum's $10 fan to cool Pi and Dongle both

    Fan is connected directly to mains supply (110V AC)

    glennblum fan - 1.jpg glennblum fan - 2.jpg
    Last edited by abcd567; 2019-08-02, 18:42.

    Leave a comment:


  • Dutchyb
    replied
    it was very weird to feel hot hot the dongle is. Tried to find answers on the internet, many people seems to have this "problem" some say it is because of the "high" frequencies the dongle has to perform. Guess a fan could be a solution, but IMHO that should not be necessary.

    Leave a comment:


  • wiedehopf
    replied
    It actually runs cooler than other dongles.
    But the case gets hotter and more importantly feels hotter because it's metal.

    I'm currently running an Airspy Mini and the whole contraption is cooled by a 12cm 12V fan running slowly on 5V.

    Leave a comment:


  • Dutchyb
    replied
    Thank you for the support.

    Does your RTL-SDR dongle getting very hot as well?

    Leave a comment:


  • wiedehopf
    replied
    Hmm, i probably need to change that check.
    I think it also checks for thermal throttling.

    Anyway, no lost samples at all, working very good


    The stick you are using now uses the same driver (rtl-sdr), so nothing needs to be changed.
    Glad it's working again.
    Last edited by wiedehopf; 2019-08-01, 18:43.

    Leave a comment:


  • Dutchyb
    replied
    I did not change anything.

    Thought that the receiver should be changed.
    Ran your test. It says I need to use an original power supply, but I do use the latest original power supply.


    The system seems running smoothly now

    pi@raspberrypi:~ $ sudo bash -c "$(wget -q -O - https://raw.githubusercontent.com/wiedehopf/adsb-wiki/master/rtl_test.sh)"
    Reading package lists... Done
    Building dependency tree
    Reading state information... Done
    The following NEW packages will be installed:
    rtl-sdr
    0 upgraded, 1 newly installed, 0 to remove and 10 not upgraded.
    Need to get 51.7 kB of archives.
    After this operation, 172 kB of additional disk space will be used.
    Get:1 http://archive.raspberrypi.org/debian stretch/main armhf rtl-sdr armhf 0.5.3-11+rpt1 [51.7 kB]
    Fetched 51.7 kB in 0s (381 kB/s)
    apt-listchanges: Can't set locale; make sure $LC_* and $LANG are correct!
    perl: warning: Setting locale failed.
    perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LC_CTYPE = "UTF-8",
    LANG = "en_GB.UTF-8"
    are supported and installed on your system.
    perl: warning: Falling back to a fallback locale ("en_GB.UTF-8").
    locale: Cannot set LC_CTYPE to default locale: No such file or directory
    locale: Cannot set LC_ALL to default locale: No such file or directory
    Selecting previously unselected package rtl-sdr.
    (Reading database ... 58548 files and directories currently installed.)
    Preparing to unpack .../rtl-sdr_0.5.3-11+rpt1_armhf.deb ...
    Unpacking rtl-sdr (0.5.3-11+rpt1) ...
    Setting up rtl-sdr (0.5.3-11+rpt1) ...
    Processing triggers for man-db (2.7.6.1-2) ...
    4642 /usr/bin/dump1090-fa --device-index 0 --gain -10 --ppm 0 --net-bo-port 30005 --max-range 360 --net --net-heartbeat 60 --net-ro-size 1000 --net-ro-interval 1 --net-ri-port 0 --net-ro-port 30002 --net-sbs-port 30003 --net-bi-port 30004,30104 --net-bo-port 30005 --json-location-accuracy 1 --lat 52.50906 --lon 6.11076 --write-json /run/dump1090-fa --quiet
    -----
    Lost samples in the first 2 seconds after starting the test are common and not a problem!
    Starting 30 second rtl_test, standby!
    -----
    Found 1 device(s):
    0: Realtek, RTL2838UHIDIR, SN: 00000001

    Using device 0: Generic RTL2832U OEM
    Found Rafael Micro R820T tuner
    Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
    [R82XX] PLL not locked!
    Sampling at 2400000 S/s.

    Info: This tool will continuously read from the device, and report if
    samples get lost. If you observe no further output, everything is fine.

    Reading samples in async mode...
    Signal caught, exiting!

    User cancel, exiting...
    Samples per million lost (minimum): 0
    -------
    Test finished!
    More than 2 lost samples per million or other errors probably mean the receiver isn't working correctly.
    Try another power supply before condemning the receiver though!
    -------
    -------
    -------
    Your power supply is not adequate, consider the Official Raspberry Pi power supply.
    Any constant voltage supply with 5.1 to 5.2 Volts and 2.5A capability is also a good choice.
    Inadequate power supplies can lead to many different problems!
    -------
    pi@raspberrypi:~ $

    Leave a comment:

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