I absolutely agree with using a dual band receiver. It drives me crazy that some of the vendors, including Dynon, only use a single band receiver, then depend on the ADS-B tower to provide them with the ModeS-1090ES traffic. That model doesn't work very well in the mountain west. Those at the Gathering noticed how quickly Kirk from Dynon Sales first tried to marginalize it when I asked the question, then when I pressed a bit harder shut me off by saying he had the microphone, so he would talk. Hey, it was his sales gig, so that's OK. But after his presentation Kirk and I talked more frankly about Dynon's use of a single band receiver and I made it a point to tell him to take this more as customer feedback from Dynon owners and builders currently contemplating EFIS systems. Kirk agreed with what I said about needing a dual band receiver and would like to see Dynon go that way. In his opinion, the market will likely force them to anyway as that is a flight safety issue.
BTW, I have had the FAA run an avionics check (3 times) against my SkyGuard EX unit. It is reporting an SIL-3 (Source Integrety Level) and SDA-2 (System Design Assurance). For those there for the Dynon talk about ADS-B (which I found to be very informative and educational), those numbers are 2020 compliant for ADS-B Out. SIL and SDA are going to come into play after Jan 1 2016. The FAA is going to stop replying to ADS-B out units with an SIL or SDA of 0. In 2020, they will require an SIL of 3. The FAA claims that some 40% of the ADS-B out units currently in use have an SIL of 0 or are misconfigured. SIL = 0 Error rate of 1 x 10 -1 (1 error in 10 reports) - 40% of current units SIL = 1 Error rate of 1 x 10 -3 (1 error in 1000 reports) - Jan 1 2016 requirement for GPS source. SIL = 3 Error rate of x x 10 -7 (1 error in 10,000,000 reports) - Jan 1 2020 requirement for GPS source. Note that this only applies to ADS-B out and has no bearing at all on ADS-B in as there is no ADS-B In requirement. -Jeff Scott Los Alamos, NM > > On 09/18/2015 10:27 AM, Jeff Scott via KRnet wrote: > > Also, for those interested in an inexpensive ADS-B In solution, there is a > > lot of buzz on the EAA web site about building an ADS-B weather and traffic > > receiver for $120 using Raspberry Pi. > > > I threw a dual band version of this together last weekend. I haven't > flown with it yet, but it seems to work well. I was watching airliner > traffic fly overhead on the iPad running WingX. > > There are even free plans that you can download to 3-D print a nice case > to put everything together. > > If you are going to build one, I'd recommend going with two of the > radios so that you can watch both 978 and 1090 Mhz bands. The radios > are only $22 each so not a great additional expense. > > > http://www.eaa.org/en/eaa/aviation-communities-and-interests/homebuilt-aircraft-and-homebuilt-aircraft-kits/resources-for-while-youre-building/building-articles/instruments-and-avionics/live-weather-and-traffic-for-less-than-$120 > > -Dj > > -- > Dj Merrill - N1JOV - EAA Chapter 87 > Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/ > Glastar Flyer N866RH - http://deej.net/glastar/ > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options >
