Peter - From point 2.122 (5MHz contact related):
We believe that telephone is the only means of contact that provides reliable and immediate access to the licensee.
Immediate means immediate to me.
“Welcome to Pedant’s Corner ”
- actually I think I was here first…
I still think that Ofcom has not “fully” thought out how to control 5MHz operation from a “Temporary location” given that the MOD need to have the details should interference occur to their operation on 5MHz.
As a minimum I would recommend that all activators intending to operate on 5MHz from a portable location make sure they have lodged their current mobile phone number with Ofcom, that they have cell coverage at the portable location before they start transmitting and that the phone is on and has sufficient charge in the battery for the period of transmission.
Individual amateurs can make the decision, whether to also give the GPS coordinates of the summit and estimated time of operation to Ofcom either via their website or via an email (both links are given in the guidance notes). Should a problem occur and Ofcom were unable to contact you via mobile phone, you would then have the fallback of saying that you had given them your location.
In reality, the short duration of activations will most likely mean that you have stopped operating by the time the MOD have contacted Ofcom and they have tried to contact you, to tell you to shutdown.
If you don’t give the location and the MOD contact Ofcom, unless the MOD have your callsign, they will be looking incorrectly at other amateurs in the area who they think may be causing the interference.