There are a number of things that can be done to go around Windows latency, but just like Time-Nuts are not satisfied with a just adequate timing solution, some hams don't like having an extra box if it can be avoided. When you take your rig and equipment to a far away destination, the most you can do with the minimum number of boxes, the better off you are.
Personally, I made my own keyer with an 8051 just because it was more fun than buying one, and I don't want to spend the time to go around Windows idiosyncrasies, but to each his own. Didier KO4BB Bob Camp <li...@rtty.us> wrote: >Hi > >There's also the time honored approach of generating the side tone off >of the generated RF. In that case the latency to the transmitter would >matter quite a bit. I have no idea *why* you would run the key through >a computer in that case …. > >Bob > >On Jul 26, 2013, at 4:52 PM, Jim Lux <jim...@earthlink.net> wrote: > >> On 7/26/13 12:50 PM, Didier Juges wrote: >>> There is a difference between managing the latency (as in ensuring >that sound and video are synchronized, but latency itself is >acceptable) and minimizing the latency as in a Morse code keyer where >the operator has to manually control the generation of elements that >can be as narrow as 20mS (one dit at 60 words per minute) while getting >timely aural feedback. That means you need the sound to start and stop >within less than about 5 mS following the key closing and opening. >>> >>> It is trivial to do on a microcontroller running at 1MHz but >surprisingly harder to do on a 2GHz Windows machine. >>> >>> It is not just a matter of time stamping the key closure, you have >to get the sound system starting and stopping. >>> >> >> Yep. although, since the propagation path is on the order of 100 >milliseconds, providing feedback to the user directly from the >interface works quite well (e.g. generating tones directly from the >keying). >> >> The challenge is trying generate the sidetone through Windows. But >really, there's no reason why you can't have a "keying box" that >provides the direct side tone and sends the events to the host >computer. Then the issue is more about keeping constant latency (or >else the CW will be really, really hard to copy) >> >> It's not like an extra 10 milliseconds of delay between keying and >the emitted RF waveform makes any difference at the other end. >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.