At 4/21/2006 18:20, you wrote:
>You will likely end up with an audible sound by using
>two signals at the same time. Let's say you use 77.0
>Hz and 192.8 Hz. These are unrelated but you will
>still get the sum and difference frequencies coming
>out, which would give you around 115 Hz and 269 Hz.
>You might hear the one at 269. If you used two signals
>that were much closer, you could hear a slow beat
>note.
I did some brief experiments using 2 CTCSS tones into a GE CG
decoder. They have to be at least 4 to 5 standard tone freqs. apart,
otherwise neither will decode properly.
Bob NO6B
>Also, depending on the kind of decoders you use, they
>may not be happy seeing another sub-audible tone
>present along with the desired one.
Very true. At a minimum you'll probably get degraded sensitivity (more
signal-to-noise required to reliably decode).
>After saying this, I bet someone will come along and
>tell you that it will work, and how to do it!
Not saying for sure that it will work, but from what little I've played
with it, it seems to.
Bob NO6B
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