Timothy wrote:
Is that quite right? The UK CAA say:
The UK CAA has chosen to implement this as detailed below, providing more flexibility to those that are struggling to equip with 8.33 kHz capable radios.From 1 January 2018 if you need to communicate on an 8.33 kHz channel you will need to use an 8.33 kHz capable radio.
From 1 January 2019 if your flight mandates carriage of a radio, then it must be 8.33 kHz capable. This rule overrides all others.
Doesn’t that mean that, for the UK part of the trip at least, Callum only needs to check that the actual frequencies he needs to use have not changed yet?
Provided he does it this year, if he goes either to an airfield that has not changed, or one where non-radio is permissible, and doesn’t use any enroute services that have changed, he should be OK.
And to save Callum time, the official information is in this AIP supplement [ local copy ]
+ Notams
or at https://www.newfrequency.co.uk for a nicer list
I have just flown down to Pau LFBP and back, IFR, and can confirm there were almost no 8.33 frequencies. In fact I recall only one, Brest 118.030.
Shoreham is going to 8.33 but like stated above all of the new ones are 25k frequencies with 5k added 
ATIS 130.980 was 130.975
Tower 121.455 was 121.45
Approach 123.155 was 123.15
i have one 8.33 radio (garmin 430) and one kx155 (25mhz) installed
if i fly to a uncontrolled airfield that has lets say 131.740 as freq. and my G430 stops working will my kx155 reach the 131.740 freq when i dial 131.750?
or what else should/can i do?
Peter_Paul wrote:
if i fly to a uncontrolled airfield that has lets say 131.740 as freq. and my G430 stops working will my kx155 reach the 131.740 freq when i dial 131.750You will hear other traffic transmitting on 131.740 but they will very likely not hear you.
or what else should/can i do?
COM failure procedures…
In more detail:
“Channel” .725: frequency .72500, 25 kHz band width
“Channel” .730: frequency .72500, 8.33 kHz band width
“Channel” .735: frequency .73333
“Channel” .740: frequency .74166
“Channel” .745: not assigned
“Channel” .750: frequency .750, 25 kHz band width
A transmitter will send the same signal regardless of 25 kHz or 8.33 kHz setting – the actual band used is much narrower than the available 25 kHz. (around 4 kHz is really used)
A receiver on an 8.33 channel will be more selective to prevent breakthrough from neighbouring bands.
When you transmit on 0.750, the .740 station definitely won’t hear you. Avoiding hearing you is why they had to buy that expensive 8.33 gear in the first place.
You might hear them if your receiver tolerates a signal way off the “centre line”, but not reliably.
I have just spent 2 weeks flying VFR over southern France. How many 8.33 frequencies did I use? Answer 1. The Blackbushe EGLK frequency 122.305 for my initial departure and return. There was however an 8.33 at one of my alternates, but it wasn’t needed.
Out of interest, I called Blackbushe on a 25kHz box and they could hear me and I could hear them, readability 4 though.
And of course 122.305 is same as 122.300 so if you use a 25k radio nobody can tell 
The CAA has done all “UK VFR” airfields like that.
Oxford Approach(125.090MHz) being one exception
