Friday, December 30, 2011
Friday, December 23, 2011
Aviation Data Link Monitoring-A Summary
Actual HFDL data burst trace from the sample included below. Monitored
on 11.387 mHz on 26 Dec 2011, it can be heard HERE. The upper trace shows
the stable phasing tone followed by the beginning of the message as seen on
Vertin Technologies dowloadable oscillosope. Trace below shows the same burst
on Vertin's Spectrum Analyzer, clearly showing the concentration of demodulated
audio energy in the phasing portion as trepresented by the spike on the left, with
the more disbursed energy of the message trailing off to the right over time.Full
detail available by clicking on trace photo.
Monday, December 12, 2011
Here they come-This morning's HFDL Monitoring
This is frequency 8.977 mHz, dedicated to the Iceland ground station. We can clearly see the tracks of the morning rush as it comes southwestward across the map, which is almost centered on Goose Bay, Labrador. Click on the image for more detail.
What's up there?
FLIGHT END POINTS A/C TYPE
CO 019 London-Newark B752 (Boeing 757-200 seroes)
CO 023 Dublin-Newark B752
CO 033 Paris-Houston B752
CO 037 Edinburgh-Newark B752
CO 059 Amsterdam-Houston B764 (Boeing 767-400 series)
CO 081 Geneva-Newark B764
CO 097 Berlin-Newark B752
UAL35 London-Houston B777
AC0873 Frankfort-Toronto B777
We can see that Continental Airlines with its massive recent growth,
leads the charge disproportionately. United Airlines and Air canada
are the last two entries.
What does it sounds like?
This is a data burst from CO 033: Data Burst As you can tell from listening,
the s/n ratio isn't that good on this frequency, as the data burst itself does not stand out clearly from the brief leading and trailing ambient noise floor. Nevertheless, that data burst resulted in a usable position report.
the s/n ratio isn't that good on this frequency, as the data burst itself does not stand out clearly from the brief leading and trailing ambient noise floor. Nevertheless, that data burst resulted in a usable position report.
Monday, December 5, 2011
Tuesday, November 22, 2011
Subscribe to:
Posts (Atom)