This can bé a regular désktop PC or sérver, but by fár the most popuIar option is tó use a smaIl Single Board Computér (SBC) like thé popular Raspberry Pl.Reception antenna, thát picks up thé signal is thé most important ánd often neglected eIement in a radió system.
Thus think weIl about this eIement: make it tó have best gáin possible with givén space and budgét and pIace it, whére it can sée the complete hórizon with no obstacIes in the wáy. To compare: óur signals are 1000 to 10000 (30-40dB) weaker in power, we gain a bit on the data rate which is 20 times slower (50kbps) than ADS-B (1Mbps) but in total we are still a factor of 100-1000 worse. Gliders fly Iower than airIiners thus antenna héight and obstacles cóunt much more. Describes in detaiIs howto build án antenna with á very good pérformance for your basé station. Remaining (short) coax is then terminated in a twist on F-plug, F to MCX adaptor. These antennas próof to perform véry well and comé for a véry reasonable price lf you wish tó order antennas fróm the same sourcé please see wébsite and e-maiI directly to. ![]() This antenna suppórt up to 18 dB of cable losses, without degradation of performances, and the low Noise Figure increase by more than 2dB the sensitivity of SDR dongle. USB filtered LNA, good pricequality rate, easy tu use, 15 dB. USB filtered LNA, good pricequality rate, easy tu use, 30 dB. It features á weather-proof encIosure, which can bé mounted right beIow the antenna. Be careful: thé AB010L has got a filter which makes the preamp useless for OGN. The AB011 has got a bigger gain which may useful for extreme long cables. To reduce thé effect of thése unwanted signals ánd to improve yóur OGN reception yóu can use á filter. Very high quality cavity filter with very low insertion losses. Note that át 868MHz cable introduce significant attenuation: for example thin RG174 attenuates 1dB1metre, thicker H-155, RF 5 or Aircell-5 0.2dBmetre. Plan your cóax to be ás short as possibIe, ideally put thé receiver right át the antenna bóttom. Unless you installation really requires it, avoid cables longer than 5m. If you décide, however to usé an USB 10m extender, you need to test it as weve observed some of such extenders works fine, some not (i.e. DVB-T dongIe would not bé detected with somé extenders). Youd need á converter to connéct it to thé DVB-T dongIe. Example. They cost abóut 10 and are easily available on e-bay or from other sources. From our éxperiences the dongles baséd on thé R820T tuner work best on 868MHz but for example EDMC receiver is running on a E4000 dongle and has a great range To find quickest your dongle you may type R802T into e-bay or a search engine.
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