On 6/27/2010 11:18 AM, J.Gordon Beattie, Jr., W2TTT wrote:
John,
Don't programs like D-RATS send data in DD mode from laptops and other
devices through the data cable of my IC-80AD when I'm not sending voice?
//Thanks & 73,//
//Gordon Beattie, W2TTT//
//201.314.6964// ////
Nope. D-RATS, which is a great program, uses the DV-Data (1200 bps
interleaved bits) on a standard DV signal -- On these links you are
only using those bits and in fact are still sending "voice" its just
silent. What is being suggested here, is to use the DD format (as
defined for the 128K 23cm links) for data communications over the same
6.25kHz modulation mask as DV. If you pull down the Shogen document
http://www.jarl.com/d-star/shogen.pdf you will see Digital Voice and
Digital Data have two different payloads with only a flag difference in
the D-STAR header.
Once this is accomplished D-RATS could use the full 4800 bps via a node
adapter, using the TCP/IP protocol as used with the Ratflectors and
point to point over the Internet.
--
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]>
