Waldo325mvfd
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what is that echo when the brodcast is made? :?
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Emergency Action Messages are usually broadcast on multiple frequencies. I don't know how it happens, but the echoes are a result of the message being sent out on the multiple frequencies. If you check 8.992, 13.200, 15.016, or 6.739, you will find there is no echo; this is the frequency where the transmission is being broadcast; all others are retransmissions.
LarrySC
Member
Thats not the answer. The signal travels around the globe from the xmtr site in all directions. The shortest path is received first and the longer path one nano second later causes the echo. Try 11300 just before dark until appx 10
m. N Africa air traffic controllers. In bad english.
m. N Africa air traffic controllers. In bad english.
I don't know about that, Larry...I've personally monitored EAMs going out, and there will be an echo on all except one frequency. I find it hard to believe that all four other frequencies would propagate like that. I could be wrong, I have been before.
I never heard that echo on 11.300...I have heard the mass confusion of ground stations passing aircraft position back and forth because their boat anchors are in a bad state of disrepair...
73
I never heard that echo on 11.300...I have heard the mass confusion of ground stations passing aircraft position back and forth because their boat anchors are in a bad state of disrepair...
73
Waldo325mvfd
Member
hay thats pretty cool.
nd5y
Member
LarrySC said:Thats not the answer. The signal travels around the globe from the xmtr site in all directions. The shortest path is received first and the longer path one nano second later causes the echo. Try 11300 just before dark until appx 10
The delay is more likley in the links to all the transmitter sites than RF propagation.
Tom
"The delay is more likley in the links to all the transmitter sites than RF propagation."
That depends on the locations of the transmitter sites and the point of origin. There is no reason why the multicast can't be from one site either. Say it's a little of both and call it even since there's no way to know for sure where anything comes from anymore with Internet and satellite links. Nope, when you hear "London Calling" the transmission can be coming from Timbucktu or however the heck you spell it.
That depends on the locations of the transmitter sites and the point of origin. There is no reason why the multicast can't be from one site either. Say it's a little of both and call it even since there's no way to know for sure where anything comes from anymore with Internet and satellite links. Nope, when you hear "London Calling" the transmission can be coming from Timbucktu or however the heck you spell it.
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