On Jan 24, 4:34*pm, "Mike Schumann" mike-nos...@traditions-
nospam.com wrote:
Be wary of 1090ES. *There are no traffic or weather uploads unless you use
UAT for ADS-B.
[snip]


There is no FIS-B (e.g. weather) data over 1090 ES, however TIS-B
traffic is very much transmitted over the 1090ES uplink and this dual-
uplink of TIS-B over UAT and 1090ES seem pretty important to making
any transition to dual physical layer work. However what exactly you
get depends on the device. As an example the Becker BXP 6401 Mode-S
Transponder claims to provide 1090ES TIS-B data output. Not all other
Mode-S transponders will do this. However with 1090ES low end units
being required in Europe I expect to see these ADS-B-In capabilities
in other affordable 1090ES Transponders at some point.

On the FIS-B side, it will be interesting to see what happens. FIS-B
may drive UAT adoption in the GA fleet (otherwise for Mode-S equipped
aircraft--the people with avionics toys and more likely to buy newer
toys?--going 1090ES might be easier). It will be interesting to see
the effects of the popularity of XM weather, concerns about no pre-
flight/on-ground FIS-B weather coverage at many locations, cost of
certified UAT systems, etc.

My point for raising 1090ES as much as I did was not so much that I
think it has anything to offer per-se over UAT as much as it appears
it is the way Europe is going. And we got sidetracked off on the UK
think and my point there was buying a Mode-S transponder with 1090ES
support provides those folks with a good roadmap to ADS-B. I suspect
some of the UK pilots are looking at the USA and discussion of future
ADS-B UAT products and worying about that too much.

I keep repeating that my concerns are primarily about using
transponders to help reduce risk of collusions with airliners or fast
jets that could seriously damage our sport. I'd just hate to think
there are glider pilots in the USA in some very high traffic areas
putting off getting a Mode-C or Mode-S transponder and waiting for UAT
products and infrastructure to appear.

And even though the airliner scenario is my main concern I am
impressed at PCAS as a tool to reduce collision risks betwen
sailplanes and GA aircraft as well. I hope people are aware that as we
work though a dual UAT and 1090ES transition that UAT devices will not
directly detect transponders and also will not receive any information
say about the many Mode-C transponder equipped aircraft when those
aircraft are outside of SSR radar coverage. Today many of us realize
that we get amazingly good PCAS coverage in places far from, or
obscured from, SSR coverage, I suspect a lot due to TCAS
interrogations. I do hope vendors like Zaon offer an evolution of
their current PCAS devices with it's passive transponder detection as
well as UAT ADS-B-In support.

Enough acronyms for today.

Darryl