ATC frequency breakthrough in UK today
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ATC frequency breakthrough in UK today
I had a lot of breakthrough from European ATC frequencies at low level (usually on approach frequencies) all over the UK today. I believe one of them was Amsterdam... Did anyone else experience this? Duct propagation or something else?
ATC frequency breakthrough
Anaprop.
Used to be able, with a big high centred over the North Sea, to speak ground to ground between Aberdeen & Stavanger on 122.1 (EGPD GMC freq.in 1977). Also a lot of strong breakthrough encountered from Amsterdam TWR & Billund on 118.4.
Happy days !
Used to be able, with a big high centred over the North Sea, to speak ground to ground between Aberdeen & Stavanger on 122.1 (EGPD GMC freq.in 1977). Also a lot of strong breakthrough encountered from Amsterdam TWR & Billund on 118.4.
Happy days !
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Maybe Farnborough is interfering with one of these
122.50000 AM National gliders NL
122.50000 AM National ,Airfield DK
122.50000 AM National, Airfield B
122.50000 AM Liège Approach (during MIL operational hours)
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The problem's not as bad as it was some years ago. I remember getting spooked in the circuit at Maastricht by a C150 with a similar C/S in the circuit at Luton (120.2 IIRC)
[pedant]BTW there is no Belgian language; try Flemish, French or German[/pedant]
122.50000 AM National gliders NL
122.50000 AM National ,Airfield DK
122.50000 AM National, Airfield B
122.50000 AM Liège Approach (during MIL operational hours)
-
The problem's not as bad as it was some years ago. I remember getting spooked in the circuit at Maastricht by a C150 with a similar C/S in the circuit at Luton (120.2 IIRC)
[pedant]BTW there is no Belgian language; try Flemish, French or German[/pedant]
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Another issue is also allowing non-8.33 equipped aircraft to fly above FL195 if a 25 htz VHF frequency is available 
The reason these are now capped at FL190 is to avoid breakthrough due to how the frequency allocations are calculated. Still see a few cruising above on a VHF frequency......
The reason these are now capped at FL190 is to avoid breakthrough due to how the frequency allocations are calculated. Still see a few cruising above on a VHF frequency......
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We had this the other night too on 124.000 and were wondering if it was due to the Temp Inversion - really confused us when we, clear as anything, heard an aircraft call up to taxi from NP1 to west runway abeam E2 for 40-50 minutes for a compass swing.
We then had another aircraft breakthrough really clearly which confused TWR who tried to bat him back to previous sector.
Then later we had the first a/c asking to taxi back to NP1.
We then had another aircraft breakthrough really clearly which confused TWR who tried to bat him back to previous sector.
Then later we had the first a/c asking to taxi back to NP1.
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When Manch' approach had 119.4 MHz, we often got breakthrough from somewhere in Germany.
Ano-prop also affects primary radar too, when St. Annes was a 264A, the coastline of Ireland sometimes appeared, just west of Blackpool!
Ano-prop also affects primary radar too, when St. Annes was a 264A, the coastline of Ireland sometimes appeared, just west of Blackpool!
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I think the longest I ever heard was a Swissair aircraft making his first VHF call to Shannon at 53N 15W. I was at Gatwick when I caught the TX.
Last edited by clicker; 12th Jul 2013 at 21:38.
ATC frequency breakthrough
Good point about anaprop & radar. At the same time that we were able to have conversations between Aberdeen & Stavanger we were also able to see the Norwegian coastline quite clearly on the 264 Radar display.
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confused TWR who tried to bat him back to previous sector
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Sporadic E
Otherwise known as Es
Complicated stuff but can be associated with high pressure, although needs a combination of other factors to happen.
There's a good graphical presentation here: Sporadic-E clouds location and estimated MUF real time map - EU which is updated every thee mins.
ST
Complicated stuff but can be associated with high pressure, although needs a combination of other factors to happen.
There's a good graphical presentation here: Sporadic-E clouds location and estimated MUF real time map - EU which is updated every thee mins.
ST
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Was on approach to budapest a few days ago trying to get the ATIS which surprisingly was crystal clear and told us it was Bremen ATIS. Had to get the required info via the control frequency as bremen blocked out budapest until below around FL150.
High pressure seems likely as the QNH was close to 1030.
High pressure seems likely as the QNH was close to 1030.
