Oh yeah, you really dont have much control over when the radio transmits. You really dont even know if it has transmitted anything. If the channel is busy, the radios will tend to hold off transmitting, so you dont walk all over everything. But if two radios are both trying to send while someone is talking, they both will start at the end of transmission and collide with each other.
D-STAR Low Speed Data has so much promise, but Icoms serial port implementation severely handicaps implementation. Now D-STARs high speed data is totally awesome. It does exactly what I want it to. Ed WA4YIH From: [email protected] [mailto:[email protected]] On Behalf Of mungewell Sent: Wednesday, May 13, 2009 5:06 PM To: [email protected] Subject: [DSTAR_DIGITAL] Re: Compression/encoding on data-only transmissions Yes, in relation to the size of the actual data sent the FEC will be about the same size (of extra bytes) for short messages. However there are other 'costs' in having resend corrupt data. 1) The message coming back to say retransmit the data or part of it (as D-Rats does). 2) Waiting for the channel 3) 'Warm up'/TX wait time on the transceiver 4) The header (48 bytes), plus the 72:24 bit(or byte?) ratio of voice to data and any sync frames (1st and every 21st) 5) End sequence 6) Transmit tail [Non-text portions of this message have been removed] ------------------------------------ Please TRIM your replies or set your email program not to include the original message in reply unless needed for clarity. ThanksYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dstar_digital/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dstar_digital/join (Yahoo! ID required) <*> To change settings via email: mailto:[email protected] mailto:[email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
