Since you are talking about "operating systems" and since most ham software is written for Windows, a much less expensive solution is to just turn off Windows sound generation. When Windows generates sounds, the CPU first shuts off the I/O ports, which causes CW stutter, generates the sounds and then returns the I/O port to normal operation. Eliminating that sound generation removes that 'stutter' generated by serial (or I/O ports) port. I have been using audio generated CW driving a simple audio detector, to key my transmitters for about 30 years and running in excess of 60 wpm, without any serial port generated stutter. And it cost a LOT less than purchasing outboard keyers!
73, Tom - W4BQF > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Don Wilhelm > Sent: Thursday, September 27, 2012 9:48 AM > To: [email protected] > Subject: Re: [Elecraft] Fwd: sending computer morse? > > Keying via DTR or RTS will work with the simple transistor circuit, but > it is subject to timing problems created by the operating system. There > is no way for an application to directly control a port, so the > application has to pass the request to the operating system and then the > operating system will control the port when it deems appropriate. That > may be OK at slow CW speeds, but the timing becomes more critical at > higher speeds. Enter the WinKeyer to solve that problem. > > 73, > Don W3FPR > > On 9/26/2012 4:26 PM, Matt Maguire wrote: > > You can do it cheaper by building a simple transistor circuit that allows you computer to > key the radio via the computer's RS232 serial port. Not quite as good as a Winkeyer, but > gets you on air very quickly so you can have a play. > > > > 73, Matt VK2ACL > > > > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
