The numbers speak for themselves really, the other interesting number is the number of unusable frames with the RTL was 3.4million with the Airspy it was 305! In the 28 hour period the RTL returned the following stats : However fairly consistently the Airspy exceeded the range of the RTL in some areas by over 50km. ADSBSharp does correct frames with bad CRC and doesn’t do any duplicate detection so I would expect more frames and position reports from ADSBSharp.Īs you can see the overall range is generally limited by geography from my location and in certain directions both radios are getting pretty close to the radio horizon.The outer ring is 400km of which both radios managed to exceed reception. This is preferred by sites such as such as FR24 and PlanePlotter’s sharing network as the CRC is weak and it can result in erroneous data being uploaded to their servers. After briefly adjusting the gain on both dongles to get the optimal reception I left them to run for about 28 hours on a week day.Īt this point its worth noting, ADSBSpy suppresses duplicate frames and it doesn’t try to correct frames with bad CRC. To ensure no issues both dongles were on separate USB3 buses. SDRSharp’s ADSBSharp and ADSBSpy V1.0.0.11 (Link is latest V1.0.0.12) programs to drive the dongles these fed into Virtual Radar Server and ADSB Scope. The RTL was connected to the other RF port:Ī quick word on the dongle, its an older Elonics E4000 based model the only modification is the Belling-Lee connect was removed and replaced with an SMA connector. The Airspy with its ability to provide power to the preamp via bias tee was connected to the DC pass through port. To enable a side by side comparison of the two receivers the feed was connected into a Minicircuits ZAPD-2DC-S+ power splitter. Based around the Minicircuits PSA4-5043+ it provides approximately 14dB of gain at 1090Mhz and has a Golledge SAW filter to remove out of band inter-modulation. The preamp is a Uputronics ADS-B 1090Mhz preamp with SAW filter.
The antenna is connected using Belden RG6 with some nice quality SMA connectors from Barenco. The indoor location is far from ideal but I currently don’t have space on the mast outside to fit it and as you can see by the results below its still performing well. I had previously installed an A3 ADS-B antenna from in my loft: I wanted to see what difference there was between the nice and cheap RTL dongles and the Airspy SDR. With my location 300 meters ASL and between two international airports I’m ideally placed for reception. A prerequisite if you enable sharing in PlanePlotter.I’ve recently been playing with ADS-B reception to test new revisions of my 1090Mhz ADS-B Preamp.
#Airspy planeplotter Pc
Synchronises the PC clock with an atomic clock. Gets aircraft registrations if they're not yet in the SBS-1 database Needed if you want to act as a Master User for multilateration
#Airspy planeplotter software
This software intercepts the SBS-1's raw data. This software enables multiple applications to connect to the SBS-1, e.g. The arrival time of the Mode-S transmissions at each user. Provided that there are sufficient suitable users receiving such an aircraft, PlanePlotter can can determine the position using Mode-S messages without position information.
#Airspy planeplotter for free
For a small fee, or even for free provided that you are a regular uploader of raw data, you can use the unique multilateration feature. If you registered PlanePlotter, you can see what other people receive by selecting the "Sharing' option, while other people can see the aeroplanes that you receive. Through a UTP cable, the SBS-1 is connected to the T510. This receiver is connected to the GP1090 antenne with about 5 m Aircell-7 coax. Originally, this was the USB version I have retrofitted it with anĮthernet module.
For ADS-B en Mode S airborne beacons, a Kinetic SBS-1 is used.
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