[TrunkCom] 9.6 K trunked systems

[Wayne M H]

On Sat, 19 Oct 2002 13:10:41 +0100, Ian Wraith
<i.wraith@sheffield.ac.uk> wrote:

>Hi Folks
>         I realise we are in rumour only mode here and no one "in the
>know" will say anything here - But does anyone know if Motorola have
>patents better protecting 9600 baud control channels than they have
>on the 3600 baud control channels ?
>
>  I ask because patent and IP issues are the only reason I can see
>why Uniden's new scanner won't decode 9600 baud control channels.
>Technically if the receiver can decode the APCO25 digital voice
>then it has the components required to decode a 9600 baud control
>channel so I wonder if they are being prevented from doing so by legal
>problems - Comments anyone ?

Considering it's a standard the information on control channel
function is publicly available. There are standard control channel
messages that would allow any manufacturer's APCO-25 trunked compliant
radio to operate on the system regardless of the actual system's
vendor. Each vendor is allowed to further create data words specific
to their network but the most common actions of the system are
detailed in the standard.

-Wayne