On Fri, 15 Jul 2016 18:48:17 +0100 (GMT+01:00), jim <k> wrote:
If you know the registration and it is fitted with an Automatic
dependent surveillance broadcast (ADS-B) transmitter as many light
helicopters/aircraft are then you should be able to enter the
registration into one of a number of flight tracking sites such as
planefinder.net and look at the time it was observed. Height and
track data should be visible.
In several thousand flying hours I have only flown one or two small
aircraft types that were transmitting and receiving ADS-B data. What's
your reference for "many"?
Most aircraft will be squawking "mode Charlie" and "mode Alpha" - this
means that the transponder will be responding to SSR (secondary
surveillance radar) scans by transmitting the flight level
(approximately equivalent to altitude) in addition to a four digit
assigned or conspicuity code. Quite a few aircraft now have mode Sierra
transponders and these will allow more information (including a unique
identification number) to be transmitted, in addition to supporting mode
Alpha and Charlie.
The transponder data will only appear on the flight tracking sites if
there is line of sight between the aircraft and the SSR head, which is
far from guaranteed if the OP was concerned about it being closer than
If transponder-based info is available from SSR data the OP would need
to know the QNH (sea-level atmospheric pressure) at the time and
location of interest in order to be able to convert the flight level to
an altitude and then to subtract the ground elevation to give an
estimate of height. Finally, the mode Charlie info will, almost
certainly, be unverified.
This whole thing has far too many holes to be of any use to the OP. It
would be far more effective and easier to find the owner/operator
details from the CAA's G-INFO site and to have a chat with them, as I
suggested at the outset.
Apologies for the jargon and lengthy explanation, but I hope it will be
of interest to someone. Now to get back to today's DIY project: building
a dwarf brick wall in the garden.
On Mon, 25 Jul 2016 11:48:17 +0100, email@example.com wrote:
The use of ADS-B out in general aviation is increasing following the
recent (and ongoing) NATS trial of integrating non-certified GPS
receivers to allow broadcasting of position via ADS-B.
A look at any of the flight tracking sites will show increasing
numbers of GA and gliders showing up.
Interestingly the coverage of the world by amateur receivers picking
up and sharing ADS-B out data and sharing it via sites such as flight
radar makes their coverage far better than that from formal services
such as the National Air Traffic Service. NATS ADSB coverage in the UK
stops at about Manchester and the Welsh border, the amateur stations
cover all of the UK from Shetlands to Jersey.
Mode S uses the wonderfully named extended squitter to allow the
aircraft to broadcast ADS-B information without the need for a
secondary surveillance radar interrogation.
ADS-B broadcasts both barometric and geometric altitude (height of the
aircraft above the earth ellipsoid), the latter from GPS. At most
they would need to know their own height although it seems some of the
flight plotting sites either correct for terrain or use corrected data
(If you watch an aircraft landing the altitude at the threshold is
The following should produce track information for now (13:37, Mon
G-TUNE Robinson R22
G-ROYM Robinson R44
G-BNSN Cessna 152
On Mon, 25 Jul 2016 14:43:14 +0100, firstname.lastname@example.org wrote:
Oh yes :-) except you don't get to see the planes. the receivers are
now quite cheap or given away by flight tracking web sites to improve
their coverage. The receiver RF bit alone (on a USB stick) is about
People leave them running 24/7 feeding data to a central server. There
are a few Raspberry Pi based designs as well, eg
In the US ipad based solutions are popular with GA pilots :-
I'm feeding fr24 from a Raspberry Pi B+ with a USB dongle (£8 on eBay) and
an antenna made from one metre of copper wire.
I'm uploading details of approx 2000 flights per day (I'm in south Hampshire).
I see A LOT of gliders and small private planes.
BTW the "payment" for feeding fr24 is a business subscription worth $499 pa.
There's a very similar system for ships, AIS
http://tinyurl.com/hmbrvqd I have a small commercial dedicated VHF
receiver feeding a commercial application on my computer (ShipPlotter)
via USB, which as well as displaying the signals locally, re-transmits
the data to the Uni. of the Aegean, for re-display internationally
(http://www.marinetraffic.com/en/ais/home/ ) It runs 24/7. Being VHF,
reception is nominally limited to LOS, but given the right weather
conditions, I can receive from vessels as far as Spain. AIUI a
satellite system is now available that allows tracking of vessels in
In fact when i get a moment or two we're going to put them on two of our
radio comms sites which will give an excellent range and coverage. Most
all of the aircraft over our place thats in line to a local airport
runway have them now excepting some older vintage planes...
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