Many of the popular ANI Detectors can/do connect
direct to unsquelched audio sources in the receiver.
The speaker audio doesn't have to be on or open to
have the mdc function work.
The mobile/portable keys, mdc or similar is sent
out well before the distant radios speaker audio
comes on/up at normal volume.
There are cases to be made where voice audio is not
sent as the ANI also has a status message included.
It gets really crazy when the two radios must send
and confirm the receipt of the signaling data as in
some public safety applications.
Kenwood has an ANI, Status and Message signaling system
known as Fleet-sync in two versions. Other companies
also offer similar products.
Just enough going on to keep the average technicians
brain cells in liquid format.
cheers,
skipp
skipp025 at yahoo.com
www.radiowrench.com
> > Thanks for advices. May be I have to define the
> > question more clearly: the DCS is for opening the
> > squelch circuit, and tone code mentioned here is for
> > ANI (Automatic Number Identification).
> >
> > What is the radio internal process to handle these two
> > functions: does the squelch circuit require to be open
> > so that the following ANI tone could be detected?
> > Best Regards,
> > Kent Chong
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