tag:blogger.com,1999:blog-35901825.post5149388827787797811..comments2024-03-19T06:03:40.451+10:00Comments on marxy's musing on technology: Atmega8 audio oscillatorPeter Markshttp://www.blogger.com/profile/13007012724570360389noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-35901825.post-22614982776604314182008-09-16T01:32:00.000+10:002008-09-16T01:32:00.000+10:00Cool! Thanks for posting. Subscribedto your RSS to...Cool! Thanks for posting. Subscribed<BR/>to your RSS too.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-35901825.post-11789581918301773842008-03-25T17:54:00.000+10:002008-03-25T17:54:00.000+10:00Yes, I'm looking forward to chatting with you on P...Yes, I'm looking forward to chatting with you on PSK31. <BR/><BR/>I'll bring along my old interface next weekend although it's rather prone to RF feedback.Peter Markshttps://www.blogger.com/profile/13007012724570360389noreply@blogger.comtag:blogger.com,1999:blog-35901825.post-52257859050807413062008-03-25T16:29:00.000+10:002008-03-25T16:29:00.000+10:00I need to get off my backside with PSK31 set-up. ...I need to get off my backside with PSK31 set-up. I have the antenna and radio now, all I need is the interface...<BR/><BR/>I was going to do it over Easter, but it never happened (other projects instead). I also have visions of a fairly deluxe interface, with level control, isolation on all paths, AF keying circuit, etc.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-35901825.post-57789653696066396032008-03-24T05:16:00.000+10:002008-03-24T05:16:00.000+10:00Thanks Alan,Yes, the original spark for this proje...Thanks Alan,<BR/><BR/>Yes, the original spark for this project was the idea of making a two tone generator for testing SSB transmitters.<BR/><BR/>Interestingly I notice that the PSK31 software I use displays IMD on received signals so it's obviously possible to measure this in software...Peter Markshttps://www.blogger.com/profile/13007012724570360389noreply@blogger.comtag:blogger.com,1999:blog-35901825.post-66732937958534367832008-03-23T23:52:00.000+10:002008-03-23T23:52:00.000+10:00That's very cool! Normally I'd just use PWM, but ...That's very cool! Normally I'd just use PWM, but doing it D2A with an R2R is more fun. :)<BR/><BR/>It would be interesting to plug the output into a AF spectrum analyser (baudline for example) and take a look at the spectural purity. Then compare that to the same thing done with PWM.<BR/><BR/>I suspect PWM (aka 1-bit D2A) will be much better, but you need to carefully filter out the clocking Anonymousnoreply@blogger.com