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Propagation / Long delayed echo
« on: July 28, 2018, 1443 UTC »
Early Saturday morning is one of those times I find that I have a bit of quite time that I can spend "spinning the knobs" of my radio.
Around 11:00 UTC (7:00 EDT) I was scanning through 11MHz and came upon a signal that at first I thought was HFGCS on 11175kHz but was not on that frequency.
I thought of HFGCS (i.e. MAINSAIL) due to the "echo" noted on the audio.
However the frequency was 11279kHz and was Gander Radio with an echo of about one quarter of a second (wild guess). At first only Gander Radio was effected and the aircraft transmissions were not. After a short while the echo on Gander Radio's transmissions diminished only to return again for a while and I could hear this same echo on at least one of the transmissions from one of the aircraft but missed which one. This effect did not last that long was effectively gone by about 11:30 UTC.
I attempted to listen to Gander on a couple of the online Kiwi SDR's but was not quick enough - I didn't hear Gander at all on some or only weakly on others.
I managed to make a short recording - about 1:15 in length (14mb in size), I have posted it here:
https://www.dropbox.com/sh/ix7wo4xgai7xvze/AAAmvMfvBes-Ylk1N2p5gWk1a?dl=0
for anyone who might like to have a listen.
The first part of the recording shows a very clear and distinct echo. About a half minute later it is almost completely gone. Unfortunately I did not get a recording of the aircraft's transmission having the same sort of echo.
I have heard echo's and delays before but this one is the clearest and most distinct that I can recall.
Some consider long delayed echoes to be those of greater than a couple of seconds while others have a much looser definition. A quick search using Google or your preferred search engine will find much food for thought.
cheers, G near Ottawa Canada
Around 11:00 UTC (7:00 EDT) I was scanning through 11MHz and came upon a signal that at first I thought was HFGCS on 11175kHz but was not on that frequency.
I thought of HFGCS (i.e. MAINSAIL) due to the "echo" noted on the audio.
However the frequency was 11279kHz and was Gander Radio with an echo of about one quarter of a second (wild guess). At first only Gander Radio was effected and the aircraft transmissions were not. After a short while the echo on Gander Radio's transmissions diminished only to return again for a while and I could hear this same echo on at least one of the transmissions from one of the aircraft but missed which one. This effect did not last that long was effectively gone by about 11:30 UTC.
I attempted to listen to Gander on a couple of the online Kiwi SDR's but was not quick enough - I didn't hear Gander at all on some or only weakly on others.
I managed to make a short recording - about 1:15 in length (14mb in size), I have posted it here:
https://www.dropbox.com/sh/ix7wo4xgai7xvze/AAAmvMfvBes-Ylk1N2p5gWk1a?dl=0
for anyone who might like to have a listen.
The first part of the recording shows a very clear and distinct echo. About a half minute later it is almost completely gone. Unfortunately I did not get a recording of the aircraft's transmission having the same sort of echo.
I have heard echo's and delays before but this one is the clearest and most distinct that I can recall.
Some consider long delayed echoes to be those of greater than a couple of seconds while others have a much looser definition. A quick search using Google or your preferred search engine will find much food for thought.
cheers, G near Ottawa Canada