Graham, Non of the send and forget modes are of any use on 500 as you have no idea if the other end has even seen your signal ,let alone resolved it, that's unless the station is in ground range and
Fine John, Yes, every little helps ! That true, you can communicate over quite a range using 'fec' the navtext on 518 prints well , but as far as I know the published service range is 50 miles for a
John, From the test's ive carried out , the best mode would be a simple 'arq' system Non of the send and forget modes are of any use on 500 as you have no idea if the other end has even seen your sig