This is my "ADSB Beast" operating on a Saturday morning while Planeplotter indicated 220 different planes. At the time of recording, a G7RGQ stacked vertical was connected to the internal receiver, while the 2nd channel was connected to a miniADSB and a 10ele yagi antenna towards the Munich airport. If you look carefully at the yellow USB LED, you see that it sometimes is not served by the PC. That is due to lack of performance of the 600MHz laptop, so the frame rate that later PP indicates is about 20% too less. Jetvision's ModeSCompare tool instead does not cause these performance lacks, so the frame rate here is true. You will notice that at the time of recording I had DF0/4/5 masked, in order to prevent Planeplotter from overload. In the graphical display you see nearly 300 DF11/17 frames per second, these are true, since they are CRC tested. It is the highest frame rate I've ever seen in ADSB. edit 20.01.2011: Meanwhile I have implemented a handshake between the RS232 driver (FTDI FT232). This solves the problem of frame losses on the USB as long as there is space in the FPGA for buffering (currently 128 frames can buffered, in later release it will mostly be 512) See also: www.qsl.net
Keywords: ADS-B, Planeplotter, miniadsb, passive radar, flightradar24, mode-s
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