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. 


Wednesday, December 14, 2011

Night fall, no rest.
Photo by the 132d PAD, Vermont ARNG


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.

Sunday, December 11, 2011

Monitoring High frequency data link on 11.387 mHz


Try it at home with a short-wave radio



Sooner or later it'll happen........

Hogs in the snow, Barnes ANGB., 9 December 1995

Wednesday, November 23, 2011

Saturday, November 12, 2011

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