Re: LF: Re: CW-Keying via Soundcard or PC speaker

[WarmSpgs@aol.com]

The problem with using a soundcard output to a mic input is not in the 
programming aspect, but is a question of efficiency and possibly power 
dissipation.  Guys who key Class C, D, and E amplifiers have enough trouble 
with the duty cycle of QRSS sometimes.  Imagine what a linear amp for SSB 
might do at full carrier continuously for a minute.  It's really, really much 
easier to optoisolate an I/O port and use old fashioned on-off keying in most 
cases.
73,
John