[TenTec] cw creation

[Grant Youngman]

> You write, "When you tap the cw key, you are actually causing 
> The DSP to run a process that results in the DSP stage 
> outputing an 11khz carrier"
> 
> That does not sound like "injecting a tone". What you 
> describe sounds like A1A emission - turning a carrier on and 
> off . Obviously, this is at a lower frequency than the 
> classic method, but it still sounds like the carrier is being 
> keyed on and off thus it appears to be A1A rather than J2A .
> 
> Was Shelby Enis, W8WN wrong when he wrote "Keying is done by 
> an injected audio tone...The emission type is designated J2A 
> ... and is the same method used by many rigs to produce cw "?
> Or perhaps I am misunderstanding him ? (his full quote is at 
> the bottom)

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