![]() ![]() In order to connect the antenna to the SPARK CORE, a u.FL connector had to be connected to the other side of the coax cable.ĭue to the small size of this connector and the 'still' large diameter of the coax this was not a simple task. With this step the antenna is already finished. In the center of the plate a 3mm hole is drilled, and the brass tube is placed at 16 mm and soldered on both sides.Ī pice of coax cable is soldered to the end of the brass tube.Ī pice of silvered copper wire is cut at 244 mm, and 8 pieces of 31 mm are marked.Īnd soldered to the brass tube on one side and to the kernel of the coax on the other side. This will be used for the radiator, furthermore some ptfe isolated coax cable and a piece of brass tube. ![]() I had some silvered coper wire laying around. On the backside I will mount the electronics. A piece of coper clad as base and reflector. Here is a picture of the material I used. My design is inspired by: De ultieme biquad Wifi antenne bouw pagina where you also can find drawings of the exact lengths and distances. This type of antenna is very popular, lots of information can be found on the internet. For my backyard experiments I decided to build a BiQuad antenna. First tests on my desk were done with a simple wire antenna with a length of 1/4 of the wavelength (3 cm). The SPARK CORE I'm using is equipped with a u.FL connector to which you can connect an external antenna with more gain than the standard chip antenna on the PCB. In order to do so a relaible WiFi connection is needed over this longer than usual distance. Now its time to wrap up and mount everything together in a neat package which can be placed in the backyard. In the meantime I did a lot of tests using the solar pannel and different types of batteries and discharge schedules monitored by a bitscope/Raspberry Pi combination ( ). Its already some time ago that I wrote my previous post in this series ( Old meets new, the 1-Wire Weather Station on the SPARK Core. ![]()
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