That is some real good information, Jeff. I like the answer to the question. Larry Bell
On Fri, Mar 13, 2015 at 9:07 PM, Jeff Scott via KRnet <krnet at list.krnet.org> wrote: > > > > Sent: Friday, March 13, 2015 at 9:56 AM > > From: "Bill Masquelier via KRnet" <krnet at list.krnet.org> > > To: "KR List" <krnet at list.krnet.org> > > Subject: KR> KR transponder? > > > > We are getting our KR2 close (year or two) to completion- > > in our area we will need a transponder (San Diego) > > We may as well go with a "mode S" since it will be required soon. > > What is the collective opinion of the group for a "modestly priced" one > that will work for us? > > Bill Masquelier > > > Bill, > > Since the others on here have cleverly suggested used mode C transponders > rather than answering your question, I'll give this a shot. > > If you're looking for a Mode S transponder that will be compatible with > the ADS-B out equipment, I would suggest buying a Trig, either a TT22 or > TT31 depending on panel space available. The TT21 will also do 1090-ES, > but the broadcast power doesn't meet the 2020 standard. The Trig TT22 > without a face is also the transponder of choice used in conjunction with > the Dynon Skyview Avionics suite. > > Of course your other option would be to go with a compact Mode C > transponder and a UAT ADS-B out unit like the NavWorX unit. If you are > starting with a clean slate for an installation, it will be less expensive > to equip with mode-S (1090-ES) than to buy a mode C transponder, then add a > compliant UAT transmitter. > > We did some ADS-B performance testing last weekend while traveling from > Tucson to Los Alamos. The FAA now has an email address you can email some > basic data and they will check your last flight with ADS-B out and email > you a report on the performance of your ADS-B unit. We tested my Skyguard > TWX and a Dynon Skyview with a Trig TT22 mode S transponder. > > The Skyguard unit meets the performance standard, but fails to meet the > ADS-B rule because it doesn't have pressure altitude as part of it's > broadcast. That is a problem come 2020 as their current units don't have > any methodology for adding pressure altitude. > > The Dynon Skyview unit with the Mode-S Trig transponder meets the ADS-B > rule, but failed to meet the performance standard due to the inaccuracy of > the Dynon GPS unit. That can be easily corrected with a new GPS puck, > which Dynon will undoubtedly be offering. > > For today, if one was planning to use a mode-C transponder and a UAT out > (which I wouldn't recommend for a new installation), I would use the > NavWorx unit. It is listed at $799, but you'll find once you get done > equipping it to actually work, you'll have roughly $1600 invested. The > NavWorx unit can be used with an inductive pickup that goes around your > transponder coax cable to pick up your pressure altitude and squawk code > for retransmit in the UAT Out signal if you don't want to have to run a > gray code cable to the unit. > > -Jeff Scott > Los Alamos, NM > > _______________________________________________ > 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 >
