[Katamarino]

A friend of mine (no, not me) is flying an RV7 from the US to Ireland. It only has 25kHz spacing. Ireland doesn't require 8.33kHz until 2024.

He doesn't want to add 8.33kHz equipment just for the flight from the Faeroes to Ireland.

What problems is he likely to face - just some grumbling?

[James Chan]

8.33kHz is now required to communicate with all ground stations in the UK, except a handful such as 121.5.

[CloudHound]

I thought Scottish and London Info freqs where still ok due to some tech reasons.

[xtophe]

Is he flying VFR or IFR ? CAS or OCAS ?

[TopCat]

James Chan wrote:
> 8.33kHz is now required to communicate with all ground stations in the UK,
> except a handful such as 121.5.

Can anyone tell if you don't? Like if you have a 25kHz box and transmit on 122.60, for instance, when the new 8.33kHz one is 122.605?

I probably knew the answer to this at one time, but I seem to have forgotten the detail since I put my 8.33kHz Trigs in.

[Sooty25]

turn it off and fly non radio?

[GrahamB]

TopCat wrote:
> James Chan wrote:

> Can anyone tell if you don't? Like if you have a 25kHz box and transmit on 122.60,
> for instance, when the new 8.33kHz one is 122.605?
>

Possibly, possibly not, but AFAIAA he won't be able to receive or transmit on an 8.33kHz channel which doesn't map to a former 25kHz frequency.

Why doesn't he just buy/borrow an 8.33 capable handheld with a headset adaptor? Hardly a great incremental cost given the nature of the flight.

[chevvron]

James Chan wrote:
> 8.33kHz is now required to communicate with all ground stations in the UK,
> except a handful such as 121.5.
No it's not.
Stations on some frequencies with more than one transmitter have offset carriers outside the 8.33 bandwidth allowing them to operate on one frequency without co- channel inerference.
An example of this is 132.8 which you should be familiar with; it transmits from both Stansted and Luton. The other LARS frequencies, 125.250 and 123.225, are also 25 khz due to multiple trasnmitters.

[Marvin]

UK AIP ref Gen1.5 and ENR1.8 apply

If he is a non ICAO compliant aircraft (assumption) doe he not require CAA permission to transit and also declare equipment?

[Flyin'Dutch']

Clearly people have different priorities but if I was going to burn off a significant amount of dosh to fly a quarter around the globe (and back) I would not consider getting a decent radio set to be an expense.

[Talkdownman]

London and Scottish Information are non-8.33 kHz spacing because they use 'multi carrier offset' transceivers.

If he needs to talk to somebody try Scottish Information, they are all 25kHz frequencies.

[Talkdownman]

CloudHound wrote:
> I thought Scottish and London Info freqs where still ok due to some tech reasons.

"offset carrier assignments are out of scope and can continue to operate in 25 kHz mode. This is because offset carrier operations are not compatible with 8.33 channels" (CAP1573)

[Lockhaven]

Just carry a suitable handheld radio.

[AlanM]

From an ATC point of view, I am pretty sure that all ATC Centres have to keep non 8.33 comms for their task as some aircraft are still exempt. Whilst 125.2 became 125.205 we stil have 120.450 as a non-8.33 Zone freq. we get aircraft with exemptions occasionally - with Brest or London calling to see if we can accept the flight.

From a legal persepctive, I don’t know how you get an exemption from the regulator in question. (The last example I had was an old Antonov with STS/HUM).

[Genghis the Engineer]

Lockhaven wrote:
> Just carry a suitable handheld radio.

This.

G