Shanwick Oceanic

[Dieselguzzler]

Morning guys,

Been monitoring 123.950 & 127.650 for a while now, picking up various transmissions but unfortunately not as often as I'd like. I'm in Sunderland area.

Are these the only frequencies available? I'd imagine these frequencies would be busier with flights requesting Oceanic clearance, as per NATS website.

Picked up 2 this morning, 1 on each frequency:

VIR7B 787-9 (LHR-LAX)
RANGER29 C30J (United States Marine Corp)

Thanks as always.

[Frequency Hopper]

127.650 is the primary frequency for Shanwick EGGX.

Also VHF on 123.950 and 120.350. (I believe 120.350 is more used on the US side of the waters)

There is also a number of HF frequencies used, 5616 5649 2899 8864 2962 8879 2972 3016 5598 4675 and 8891

[Minus1]

Use of the two Oceanic clearance frequencies is based on where the aircraft is registered.

See NATS Document ENR 2.2 Page 22
http://www.nats-uk.ead-it.com/public/in ... id=11.html


123.95
"For use by aircraft registered in States West of 030°W for requesting Oceanic clearance direct from OAC."
So North & South America (and maybe New Zealand - though it isn't mentioned)

127.65
"For use by aircraft registered in States East of 030°W for requesting Oceanic clearance direct from OAC. For this purpose Australia is regarded as being East of 030°W."
So Europe / Asia / Africa and Australia (which is mostly 'East' anyway)

(30W is basically mid Atlantic)

123.95 and 127.65 are both transmitted from the Waltham in the Wolds site in Leics - where both seem to have a positive offset (7.5k?); and doubtless several other sites too.


These two are used like the HF frequencies:
127.9
124.175
"To be used as far as practicable by aircraft when East of 020°W so as to reduce the loading on HF channels.
Traffic received on this freq is handled in exactly the same way as if received on HF."
(20W is basically the southern tip of Iceland)

So they are probably transmitted from the west coast of Ireland and/or Scotland (such as Mangersta on Lewis which is just about as far North West as you can go, apart from St Kilda).

[Dieselguzzler]

Thanks

[Dieselguzzler]

Correct me if I'm wrong, these frequencies are from Prestwick ATC centre, so in theory closer to Prestwick more transmissions received?

[Minus1]

The location of the control centre is irrelevant, it could just as easily be in Swanwick, Hampshire or Shannon, Ireland.

What matters is the area of responsibility.

There is a map on http://www.nats-uk.ead-it.com/public/in ... id=11.html

6.2.1.1