On 6/25/2010 11:56 AM, john_ke5c wrote:
a.k.a. wish list; I suppose this would reduce the attractivene$$ of the ID-1, but what if Icom had created a "9600 baud data mode" with a dd (two lower case D's) mode as well as the DV and DD modes for the vhf/uhf rigs? We would call this the "not as slow data mode", and the radio display would work as a simple display screen for a really dumb terminal. Either one module in a stack would be dedicated to this mode, or the dd packet would be identifiable so that radios in the DV mode would not try to decode the audio. Error correction would have been included, so the actual rate would be less than 9600, but still 3 or 4X the current low speed rate, and the radios would be useful for more than they are now. Probably just another Friday PM daydream. CQ FD! 73--John
PA3YBR has already run DD over the 4800 signal on D-STAR. To tell D-STAR you are using DD format (Ethernet Frames) rather than DV (Voice) format is only 1 flag bit in the header. Fred says this does not harm DV communications on the same frequency (though you can only have 1 signal at a time). The problem is the RP2C repeater controller has expectations on whether an attached module is DV or DD and likely Icom G2 software has the issue as well.
With the advancement of alternative repeater/controller/gateway chains using node adapters <http://enicomms.com/>, this mode is well within reach (though out of spec). Build up a G4ULF repeater <http://g4ulf.blogspot.com/2010/02/release-plans.html> or DVAR Hot Spot <http://w9arp.com/hotspot/> (I have done this - it was relatively simple http://k7ve.org/blog/2010/06/nw7dr-the-d-star-repeater/), work with G4ULF and KB9KHM to support both repeating of these data streams and to break them out to the /dev/tap /et voilà/! Then for user radios, until there is an integrated solution from a manufacturer, one would just need to use node adapters with an appropriate driver that looks like an Ethernet device (very slowly).
Remember though, that you will need to have strong signals or bit errors will get you on these packets.
-- John D. Hays Amateur Radio Station K7VE <http://k7ve.org> PO Box 1223 Edmonds, WA 98020-1223 VOIP/SIP: [email protected] <sip:[email protected]> Phone: 206-801-0820 801-790-0950 <mailto:[email protected]>
