"Although I think some gps technology like this is the future and the
correct way to go, I don't see a real lot of value in a receiver only
module. If I buy a receiver only (cos its cheap) and every one else does
the same thing no one will know where the others are, but worse, now we
think we are alone."
The receive module is a totally stand alone system that has nothing to
do with the real aim of ADS-B, which is surveillance. The idea is to
have most of the GA fleet fitted with these devices, at this stage
gliding, UL etc have not been included, but could be. The existing 1090
MHz transponder system has to be replaced ( I think around 2008 ) with
either a new mode A/C unit which is outdated and in efficient, or this
new ADS-B proposal, which is in trial currently. America and Europe are
looking at this with interest, already it has trialled in Alaska very
successfully using the UPS system.
So to summarise- the receiver is for an add on benefit only, receiving
GPS "SQUITTER" ( a term used to describe the ADS-B transmission ), on
the other hand the ADS-B transponder is a fitment that may be required
as mandatory ( like in New Zealand )- it may not cost much or anything ,
it depends on the Government of the day, but to re fit mode A/C will
cost hundreds of millions, to fit ground based receivers only and new
ADS-B transponders is < hundreds of millions - so we may get a cheap
subsidised unit. These are not the official words of ASA or CASA, but
the inference is there.
I hope this answers the question of who will have transmitters to be
watched by LCD TIS ( traffic information systems )
Note also, that gliders can be fitted with this, maybe even just for
comp flying to have the benefit of the crash avoidance information,
which can be automated to give you an alert of traffic within a defined
radius, flying here one comp when the fires were burning an visibilty
was reduced - it would have been real handy! It also will alert you of
GA traffic as well, in fact anyone using the ADS-B will be displayed,
maybe even on your B2000 moving map( hey mike? ) or Zander etc - just
waxing philosophically.....
"Nigel,
what is the current draw of the transmitter version?
(ie how long could I expect it to run from a 7ah battery)
And how low is low cost really?"
Costs are un defined currently, the aim is to have a unit costing the
same or slightly more than a conventual mode A/C transponder,
remembering that this unit will have an approved GPS built into it.
Current mode A/C aircraft can simply remove the old transponder and
replace with the ADS-B black box, use existing aerials and encoders (
yes, they still use pressure derived height - not GPS height! ).
Current consumption, depends on the GPS used, somewhere around 300ma ,
TX has no significant rise as the short pulse duration draws current
from some large internal capacitors so the overall average remains the
same. So a 7ah battery would last the day quite easily. The new microair
encoder ( EC2002) draws 10ma above 10 degrees C and 50 below 10 degrees
C ( in short 5 second bursts, once every minute ).
I urge all to log on to the air services web site , follow the links to
the ADS-B trial, also , type in ADS-B into your search engines and there
are quite a few references to this new technology- and Australia is
right up there for once, doing some good old R&D and forward thought!
As a footnote, most international and even domestic jets etc already
have TCAS and mode S transponders, for them to squitter ADS-B is quite
simple, nearly all can be done with a software upgrade , so this makes
all aircraft visiting Australia compatible with the new proposed network
and this is the reasoning for the rest of the world to do the same.
Regards
Nigel Andrews
Managing Director
RF Developments Pty Ltd
"A Queensland Company devoted to Research and Development in aviation
electronics"
Email [EMAIL PROTECTED]
Web www.rf-developments.com
Ph: (61) 7 54635670 Fax: (61) 7 54635695
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-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Kittel,
Stephen W (ETSA)
Sent: Monday, 1 September 2003 9:24 AM
To: '[EMAIL PROTECTED]'
Subject: RE: [aus-soaring] RE: National Airspace System radar coverage
[HyperScan 1.7]
> -----Original Message-----
> From: RF Developments [mailto:[EMAIL PROTECTED]
> One safety benefit is that
> for under a few hundred dollars, you should be able to buy a receiver
> with LCD screen, that will display all aircraft broadcasting in your
> area ( line of site ), in effect, a crash avoidance and traffic alert!
Although I think some gps technology like this is the future and the
correct way to go, I don't see a real lot of value in a receiver only
module. If I buy a receiver only (cos its cheap) and every one else does
the same thing no one will know where the others are, but worse, now we
think we are alone.
> , Honeywell have won the tender to supply 17 aircraft and Microair (
> whom I am contracted to develop this ) will supply the low cost
> GA/UL/Gliding version, based on the current T2000 technology.
Nigel,
what is the current draw of the transmitter version?
(ie how long could I expect it to run from a 7ah battery)
And how low is low cost really?
Regards
SWK
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