Karl Arne, >The document I'm referring to is the CEPT/ERC/REC 74-01E< OK, Karl-Arne, thanks. No problems there - I was heavily involved in producing that document and especailly that Annex, and it merely reflects ITU-R SM329 with some easings to take into account the reality of phase noise at UHF/microwaves. 73 Peter G3RZP