Just as amatter of interest. Here in the UK, where we fly on 35Mh., we can change both Tx and Rx Xtals at will which is very handy on busy sites. The 'unwritten law' is for power to use odd nos., gliders even. Of course, over the English Channel, in the smaller part of Europe a different frequency band is used. Some sites insist on the local but I have found that "visitors" are able to use their own frequencies with the local bosses sayso.