Luc I've uploaded the relevant parts to http://www.astromag.co.uk/2018%20second%20functions.pdf It's a four page scan from the Marconi 2018 manual, hopefully it will be the same on the 2018A. I have a 2018 and 2019A (the latter for spare parts). The download is 8 MB... 73 Dave, G4AON K1, K2 and K3 on order.