Re: Fwd: sending computer morse?

Posted by Chester Alderman on Sep 27, 2012; 2:51pm
URL: http://elecraft.85.s1.nabble.com/sending-computer-morse-tp7563309p7563347.html

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: [hidden email]
[mailto:[hidden email]] On

> Behalf Of Don Wilhelm
> Sent: Thursday, September 27, 2012 9:48 AM
> To: [hidden email]
> 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
> >
> >
> >
>
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