At 12:01 AM 30/11/2010, you wrote:
I have to point out that this statement has been influenced by the
apparent intention in the DP to convey the impression that
ADS-B requires fitment of a Mode S transponder. Only in one place
does the discussion paper admit that "For ADS-B OUT, an aircraft
requires a GPS positioning source and an ADS-B OUT transmitter
<which can be either a> (Mode S ES transponder or <a stand-alone>
transmitter)... The ADS-B OUT transmitter is normally included in
the Mode S transponder but may also come as a stand-alone
(non-transponder) squitter device with only an on/off control switch
an go/no-go indication to the pilot."
So what we are really arguing is the nature of the rf link, not the
mandatory fitment of these devices. A simple ADSB OUT transmitter
actually will be the rf section of a Mode S transponder. Yes the peak
transmitted power is high but the pulses are short. I doubt the
current saving will be large.
Other airspace users will want much more range than offered by Flarm.
10nm might be a minimum so that you can avoid targets from beyond visual range.
Given the FAA 2020 mandate, lots of luck convincing the bureaucratic
juggernaut to change direction. They might, but be careful what you
wish for, there may be side effects you don't like.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments since 1978
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
email: [email protected]
website: www.borgeltinstruments.com
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