[Trunkcom] MultiNet

Sun, 6 Jan 2002 10:50:06 -0500

In an LTR system, if you add new frequencies to the system, do all the
radios have to be reprogrammed?

Ken Roberts
[email protected]

----- Original Message -----
From: Larry Williams <[email protected]>
To: <[email protected]>
Sent: Sunday, January 06, 2002 12:57 AM
Subject: Re: [Trunkcom] MultiNet

> We run LTR systems from La to Fl. In New Orleans, we have two 20 channel
> systems, two five channel and one seven channel system.  The smallest
> system we have has 3 channels, located in a rural area. We can chart
> system load for any time of the day.  Very rarely do we get busys.  If
> it starts to happen, we add a new channel.  When I say 3 conversations,
> thats 3 actual speakers. By way of trunking, and people unkeying to
> listen, you actually have more than three "conversations" going on at
> the same time.The average key up time is short and most people have a
> short delay between talker A unkey and talker B keyup.  They have to
> stop and think what to say before pressing ptt.  The biggest culprit
> for  busy channels is actually, interference, skip, if you will, even on
> 800 and iden noise is one of the worst. Some customers who have long
> winded talkers are welcome cause its easy to put up a new channel, and
> the more they talk, the more we make.
>
> SJ wrote:
> >
> > --------Remember, if you have 3 channels in a system, there
> > can only be 3 simultaneous conversations going on.------------
> >
> >  That's what I meant, really. I mean think about it, you have say 3
> > channels,3 very busy channels at one given time. It just doesn't make
any
> > sense to put more than 3 agencies/businesses on that system, especially
if
> > one of them is public safety(I'm theorizing LTR here). 3 years ago when
we
> > had the ice storm, I had 2 scanners going on the county trunk system
just to
> > keep up. We had people using their old low band stuff just to keep in
touch,
> > quite confusing.
> >  It is possible, however unlikely, that this will happen again.
considering
> > the cost of the system, one would think they would have added a couple
more
> > freqs.
> >
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]]On Behalf Of Larry Williams
> > Sent: Saturday, January 05, 2002 10:36 PM
> > To: [email protected]
> > Subject: Re: [Trunkcom] MultiNet
> >
> > Man, you must not have much excitement in life if you have to worry
> > about "busy tones".  Remember, if you have 3 channels in a system, there
> > can only be 3 simultaneous conversations going on. So many low end users
> > think of it as a CB and use it accordingly. They are in their trucks and
> > get bored so they talk to the other bored drivers. THAT, eats up air
> > space. Especially on a multinet system or any other where you have
> > selective calling between individual users.  5 chan system, 1 company,
> > 20 bored long winded drivers, ... BUSY SIGNALS.  By the way, same goes
> > for cops and public service folks as well.
> >
> > It would be interesting to see if someone was encountering a busy signal
> > or two or  more.  At least when we made the move to the system here they
> > told us about busy tones, and said that the chances of someone getting
> > one
> > were slim to none, but I heard that in Warren, Michigan they were
> > telling
> >  non public safety workers to quiet down because of busies.  By the way
> > I
> >  found out that Warren will be adding its old MDT channel to the trunked
> >  system pool, because they just switched services, so the 856.0375 will
> > soon
> > be part of the system.
> >
> > ------------------------
> > >snip<
> > Come on now. The only way you heard the LTR burst on the bus radios was
> > if it was running conventional on the same freq as the LTR channel.  If
> > it was LTR, the radio had to either been modified or defective.  The
> > only thing you can "HEAR" on an LTR channel burp is the squelch on your
> > radio opening and closing, period. The NEW Kenwood LTR radios have what
> > is called FleetSync where they send out MFSK data either at the
> > beginning or end of transmission that contains a 7 digit code that is
> > unique for each radio in a fleet. It can also be used to send canned
> > status messages or even short and long data messages like a MDT. You can
> > hear that data but its only been in use a couple of years.
> >
> > >         Now, the LTR system that I used to have to listen to all the
time
> > > on 800 MHz in school like I said had the burst, and it was even coming
in
> > > over the bus radios.  This bus company is now on 900 MHz with I think
a
> > > conventional system but they are using CTCSS tones from what I've
> > > noticed.  Aren't the newer LTR or multi-net systems using tones or
data
> > > bursts you can't hear?
> >
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