Grant,
Thanks. That makes sense.
How about sound card technology? I believe there is a way to send cw
using a RigBlaster type set up. Does anyone know if "Rigblaster CW" would
be the tone injection method, or does the sound card DSP key a single
frequency on and off resulting in true A1A?
tnx to everyone contributing
Bob, KB1CIW
At 08:48 PM 4/24/2005 -0500, you wrote:
> <snip>
>
>I think we're getting our tongues wrapped around the ideas crosswise here.
>
>As Steve said, some Collins radios (at least the KWM-2 and I think the
>32S-1) used the audio tone injection method. And it wasn't a particularly
>happy marriage [particularly in the KWM-2).
>
>A keyed carrier (a lot of assumptions and hand waving) results in a single
>frequency being transmitted. A tone modulated SSB transmitter (more
>assumptions and hand waving) has a carrier (reduced) and an opposite
>sideband (also reduced). So it results in THREE transmitted signals -- the
>one you want, and two more you don't want at some (hopefully) reduced level.
>If the opposite sideband and carrier are reduced far enough, it looks like
>A1 -- if they aren't you might at least hear from an OO if the FCC :-)
>
>The DSP stage outputing an 11 Khz carrier is NOT the same thing as a "tone".
>It is a real, single frequency, RF carrier that gets mixed in several
>heterodyne stages to the desired output frequency. And is standard,
>ordinary, everyday A1.
>
>I haven't dug into it, but I believe the Orion (and any other current DSP
>radio worth its salt) will do the latter -- true A1.
>
>Grant/NQ5T
>
>
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