Nate Bergmann wrote:
> On Sat, Apr 29, 2000 at 08:09:48AM -0300, John Ackermann wrote:
> > Hamish wrote:
> >
> > > > 1. A CW keyer on the parallel port with programmable speed.
> > >
> > > Personally, I would prefer to generate the CW as audio tones injected
> > > as SSB.
> >
> > This is probably not a good idea. Many (most?) rigs are only optimum
> > for CW receive when set to CW mode -- operating in SSB will lose a lot
> > of RX capability (narrow filters, fast AGC, and proper zero beat).
>
> >From an operational standpoint John is right. However, we here in the
> States may run into another problem. Modulated CW (MCW) is limited by the
> U.S. rules to above 30 MHz. MCW is defined as, "Tone-modulated
> international Morse code telegraphy emissions..." I don't wish to
> start and off-topic discussion, but, at least for contest and normal
> CW work, I would prefer the program controlled the state of a pin on
> a port that I can drive my rig's key input with, or at leat had the
> option.
Hmmm... I think that injecting audio into an SSB exciter generates a
true CW signal -- it's not MCW because there's no carrier; you're just
using the SSB generator as a mixer to add the keying tone to the RF
frequency. That's also the way many rigs do FSK for RTTY. Of course,
you do need to have good suppression of the carrier and opposite
sideband to keep it legal, but with today's rigs, that's not a real
problem.
John
--
John Ackermann N8UR
Dayton, Ohio, USA
[EMAIL PROTECTED] -- http://www.febo.com
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