Hi Jeff.

ACSB is a compressed SSB signal that is expanded again at the receiving
end.  The tone that you hear is a pilot tone that is used to lock the
reciving station precisely on frequency with the transmitting station to
prevent the "donald duck" effect and provide a signal that is a reasonable
approximation of the communications that we've gotten used to on FM or
Phase modulated systems.

73, de Lou K2LKK

At 11:04 AM 5/3/2005 -0400, you wrote:
>Good morning listers.  I just did some lookingaaround on the net here at a
>few of those trunking systems that I thought were using the ESSB that was
>demonstrated the other night on Coast and it turns out that many of these
>systems are using ACSB which is another form of sideband.  Does anyone know
>about this form and how it differs from traditional sideband or the new
>ESSB?

Louis Kim Kline
A.R.S. K2LKK
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