http://elecraft.85.s1.nabble.com/sending-computer-morse-tp7563309p7563380.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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