¿ªÔÆÌåÓýHi, Have a quick question on this. So I¡¯ve been playing with packet, 300bd SSB and 1200bd FM a fair bit. All good. Now, regardless of band and so on, is 1200bd good on SSB, rather than typical FM? FM seems to be the standard for 1200, including aprs.? However you could try sending it over SSB, on paper seems like it might or should work. However.. A local station n1ugk and I tried today as an experiment. We had a reliable link on 2m 1200bd FM. Then with almost no other changes we switched to LSB and it interestingly it would not decode. Packets were heard but not understood. Even with the power advantage of SSB over FM. It would just not work.? I guess thinking about it now with hindsight perhaps it was something else, frequency offset or something maybe, a misalignment but also we know 300bd SSB works fine and it was the same rigs and all too. Is there a technical limitation for 1200bd+ on SSB or should it have worked in theory? If it can work I guess we should go back try again and weed out the issue - but it¡¯s made me curious. I always thought 1200bd and aprs FM preference was mainly to leverage cheap FM rigs, not because SSB would not work at 1200. Now I am curious about that assumption¡ Of course on 10m, SSB and FM are both allowed in the right spots, which then also raises question of the valid combinations. 300bd Ssb, fine. 1200 FM also fine? 1200 Ssb also fine (if it ever works properly as per my doubt)? 300bd FM I guess is a weird one, probably not very useful but I suppose it is legitimate according to FCC etc all the same. Above HF we can go to 9600 on 6m (supposing again only viable on FM) and up in UHF 56k even, do I have that right?? Many thanks, Louis kd2yck? On Oct 19, 2023, at 2:43 PM, Warren Conklin via groups.io <wconk@...> wrote:
|
