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Linux, Raspberry Pi, RPi, and FR24

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  • #31
    microADSB ist basically another implementation of the miniADSB, a well known PIC based dedicated receiver. It is not a SDR solution like dump1090 is.

    I tried other baud rates too. With no change.

    Thanks for the hint with the powered Hub. I should receive one next week or so and will give feedback here.


    • #32
      For some time I've been using the raspberry pi + RTL dongle,

      The little whip antenna that came with the tuner dongle brought in signals from about 45-50Nm (Nautical miles) ... that's about 90Km

      Initially I made up a simple dipole antenna by separating out 137mm the centre core + insulation and the copper braid from some TV coaxial cable - bending them in opposite directions - based on the idea here

      fixing about 20cm beyond the house gutter on the north side of the building with the elements vertical ... probably about 5m from the ground (bear in mind I'm just west of Birmingham, UK) - this gave me cover roughly from The Wash in the East, through Leeds, occasionally Whitehaven, Isle of Man, just short of Dublin, and down to Gloucester (but that's over the other side of the roof) ... that's about 145Nm range where there are no buildings in the way

      Simple dipole antenna

      dump1090 map using simple dipole - the roof of the house blocks signals from the south

      I've also made up a cheap collinear antenna following the instructions at - 11 elements no terminating resistor (didn't have one in my odds and ends box) - see

      stuck the antenna to a bamboo pole and held it out a window on the south side of the house - I'll have to sort out proper brackets and a tube to put the antenna in - anyway these are the results with it taped to a slightly damp bamboo bean pole

      I'll could put up some T & K brackets and mount up the co-linear ... it would be nice to mount it on the chimney - but I don't fancy getting up there to do it - though I think I'm more tempted to see if I can work two dongles on one pi (or two pi's) and have two dipoles - one out front and one out back.
      Last edited by peterhr; 2013-06-22, 15:43. Reason: add content


      • #33
        Tried a 10m active USB cable between the PI and the Realtek RTL2832U+R820T - the PI couldn't set the registers in the tuner.

        Tried to do the same with a powered USB hub powering the PI and and between the pi and the Active USB cable - same result.

        Did then doubt the Active USB cable - could run a pen memory stick from a windows PC through it so it seems OK.

        Next thing to try is to put the Raspberry Pi with the tuner stick on the antenna in a sealed box (I'm thinking of one of those clip type lunch boxes like this but of appropriate size)

        The box would be put somewhere away from direct sunlight and rain (I'm thinking of velcro straps under the eaves - but could be in a bigger ventilated 'shade box' on a mast. Ethernet and antenna feed would be taken into the box through a hole then liberally sealed with silicone from a chalking gun.

        Run the electronics with power over Ethernet. (A standard Ethernet cable contains four twisted pairs of conductors - one pair is used for signals one way along the wire - another pair for the signals the other way ... that means there are still four conductors spare. Commercially POE is used for office IP phones and things like webcams at 48v ... we won't be so ambitious - we'll try first at 5v since that is what the PI needs.)

        to do the POE we need some bits that are sold for CCTV use

        To carry the power onto and off the cable
        PoE Passive Power Over Ethernet Adapter Injector Kit

        and to feed the PI an adapter (only the female one is needed) - connects to GPIO pins 1 (+ve) and 3 (gnd)
        The male one could be used to feed the power into the cable, but I have a USB -> 5.5mm adapter lead - so don't need it (yet)

        ... that didn't work ... too much volt drop on the Ethernet cable.

        Next thing to try is to poke 12v up the ethernet cable, then regulate it down to 5v by the Raspberry Pi using one of these
        Car Charger DC Converter Module 12V To 5V 3A 15W with Micro USB Cable (input really 8v - 20v)

        Even if we get a 2v drop on the cable we'll still be within the range that the regulator can handle - waiting for parts - watch this space!

        Oh and do put a short (25cm?) USB extension cable between your PI and your tuner ... it's for stress relief for the USB plug on the tuner & socket on the PI if the antenna wire is stiff
        Last edited by peterhr; 2013-08-05, 17:43. Reason: added detail


        • #34
          POE (Power over Ethernet) on the cheap and is working!

 voltage regulator arrived today - it has a micro USB to connect to the power socket on the PI
 female adaptor feeds it from
 with 10m of ethernet cable between the two parts (on the RJ45 plugs on the adaptors go into the PI and into a homeplug)
          this is then fed from a 12v power supply

          Once I find a waterproof box - the Raspberry PI + Realtek RTL2832U+R820T and go on the mast without needing expensive coax or Active USB repeaters (pictures at the weekend)


          • #35
            Originally posted by peterhr View Post
            Once I find a waterproof box - the Raspberry PI + Realtek RTL2832U+R820T and go on the mast without needing expensive coax or Active USB repeaters (pictures at the weekend)
            Would something like this be ok:

            I know this to do wit boats. but it has some good information about waterproofing:
            Last edited by speedbird1960; 2013-08-15, 21:02.
            AMS Daily Fight Information:


            • #36
              Maybe, but doing cheap, I was thinking more along the lines of a plastic bacon box (long and narrow) or a inverted cereal box (deep and narrow) with a blue seal and clip on lid. Bring the wires in the bottom - put silicon chalk around them. Would need sun shade (outside box) to stop solar heating and the box itself would need enough surface to dissipate about 5 watts (or bolt heatsinks inside and out using the bolts as heat pipes to transfer the heat from inside to outside)

              I'll see what I can take from the kitchen without to much strife.
              Last edited by peterhr; 2013-08-15, 22:04.