[Trunkcom] MultiNet

[Brian J Cathcart]

On Fri, 04 Jan 2002 11:55:56 -0500 "Jerry Kacprzycki"
<Jerry.Kacprzycki@thompsonhine.com> writes:
> So you have sub-audible data and a control channel?  How can a 
> control channel be used for voice?

The Multi-Net control channel is not like Motorola or EDACS control
channels.  The Multi-Net control channel transmits the control data on
the sub-audible portion of the channel, leaving the voice portion
available for communication.  All radios on the system "listen" to this
data on control channel frequency and ignore the voice portion.


> IS this like a S.C.A.T. feature 
> found in single frequency / single L.C.N. E.D.A.C.S. T.R.S.s?

NO.  SCAT and VOC (Motorola's version) temporarily shutdown the control
data being transmitted, then use the frequency for voice communications,
then the control returns once the conversation is over.  Multi-Net
continues to transmit the control data on the control channel while voice
communications occur; since it is sub-audible it does not interfere with
the voice communications.

Listen to a Multi-Net control channel on a scanner and it will sound like
a dead carrier with occasional voice communications.  Connect the scanner
to a good speaker (with good low-frequency response) and you will hear
the "rumble-rumble" of the control data (similar to what you'd hear on
the voice channels, and similar to what you'd hear on LTR voice
channels).

--

The Scanner Dude
Brian J. Cathcart - KE4PMJ
South Florida Trunking Guide - 5th Edition (On CD-ROM too!)
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