--- Begin Message ---On 05/24/2012 09:52 AM, Peter wrote:Yes. But you can design your data format with the assumption that it will be used on a low-bandwidth channel. This is not ruling out sending simultaneous data and other things you would do with more bandwidth. But I suggest that when we have to send simultaneous data, we do so by taking up two narrow-band channels. When we don't have to send it, or when we can get along with only a little data, we use one channel.I agree. I think the problem is that while we can make specifications for lower bandwidth GMSK/FSK modems. Until there's some hardware we can make to test it, it'll just be theory.1400 would be tough. Since we'd need to drop voice frames to get sync. Unless we can get reliable sync from the codec frame as Dave suggestsLet's break this into two steps: 1. Recover the bit clock. Should be do-able with any real-world data.2. Find where the beginning of the frame is. One way to do this is simply to try starting with each bit boundary until we get frames that decode correctly, and have some inter-frame correlation.It's a fact that coordinated channels are not busy much of the time, and there can still be need for them to exist as coordinated channels. The frequency coordinator here doesn't really allow "warehousing" of frequencies, if you don't use it, you can lose it. I am pretty sure I can reach 100 different repeaters from here, and not all of them are active at once.So a quick scan of 2m has..I find one repeater active (one that by the way is some 20 miles away), and a DV simplex node (on the other side of the city). And some APRS activity on 144.8 and acitvity on 145.650 (which is from a 2m lift, since it's a repeater that is fading). That's all.Thanks Bruce<<attachment: bruce.vcf>>
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