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In reply to the coverage question, I believe its due to the digital
nature of the signal. The information I have shows a considerable
range increase. <br>
<br>
As for bandwidth, there's a new "version" of P25 due out which is
6.25khz bandwidth, but NZ Police are using 12.5khz I believe. <br>
<br>
I don't think you'll see Police allowing any other group to use
their network, even though yes it could be done. Part of this will
be due to the nature of the repeater sites. Most sites will contain
4 repeaters (this is the minimum they will install at one site too)
- one for control and 3 for actually passing conversations. While
yes this could hold more than 3 actual channels, the channels are a
heck of a lot busier now than before, as most info that was passed
by cellphone now doesn't need to, and can go out over the radio. As
such, your average two channels covering an area are in use most of
the time. When there's also AOS, CIB, and the Proactive groups to
consider that will need a channel as well, that won't leave much, if
any, room for anyone else.<br>
<br>
On 3/08/2011 4:48 p.m., <a class="moz-txt-link-abbreviated" href="mailto:nivick@vodafone.co.nz">nivick@vodafone.co.nz</a> wrote:
<blockquote
cite="mid:9c0e54a67c011707a4b69c1092163fa7@vodafone.co.nz"
type="cite">
<p>Is P25 narrow bandwidth? Trunking allows more groups to use
less spectrum allocation, ambo could use the allocated channels
for police and no one would be<br>
the wiser. Control Channel is not picky who it allocates talk
channels too.</p>
<p> </p>
<p>On Wed, 3 Aug 2011 16:34:19 +1200, Scanhead
<a class="moz-txt-link-rfc2396E" href="mailto:scanhead@gmail.com"><scanhead@gmail.com></a> wrote:</p>
<blockquote style="padding-left: 5px; border-left: 2px solid
#1010ff; margin-left: 5px; width: 100%;"><!-- html ignored --><!-- head ignored --><!-- meta not allowed -->
<p>Has coverage improved purely because its a digital signal? Or
because the bands have changed or more equipment is installed
(larger network etc)? Is it like comparing AMPS to GSM
coverage wise?<br>
</p>
<div class="gmail_quote">On Wed, Aug 3, 2011 at 3:27 PM, Mike
Bailey <span><<a moz-do-not-send="true"
href="mailto:tahiini@gmail.com">tahiini@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0 0 0 .8ex;
border-left: 1px #ccc solid; padding-left: 1ex;">
<div>
<div class="im">"So what are the advantages of P25
over analog if secure communication is not an issue? "<br>
<br>
</div>
Coverage is improved. Also, on the fringe areas, you
either have full coverage, or none at all - not the
sometimes scrambled guff we can hear now and then. Also,
the radio itself can tell you if you're in coverage or
not.
<div class="im"><br>
<br>
On 3/08/2011 2:54 p.m., Scanhead wrote:</div>
<div>
<div>
<div class="h5">
<blockquote>Perhaps the confusion is because the
police are using ESB band with P25 trunking as the
replacement for ESA... Which is normally
(and probably still) where ambo operates.
<div><br>
</div>
<div>Can anyone confirm that current digital
scanners are still not able to follow tait P25
trunked? From memory it was to do with the data
rate of the control channel (could be wrong). I
could get unencrypted voice with my uniden
digital but was never able to follow
the conversation. Thats why I started looking at
software radio etc.
<div><br>
</div>
<div>It is ironic that the P25 system came into
being because of a need for radio systems and
services to inter-communicate, and now it is
what separates them. Some will argue that P25
radios can communicate with the old analog
systems (mixed mode), but I've been told this
is not possible with a trunked system. (again,
could be wrong)</div>
<div><br>
</div>
<div>So what are the advantages of P25
over analog if secure communication is not an
issue? </div>
<div><br>
</div>
<div>Scanhead.<br>
<br>
<div class="gmail_quote">On Wed, Aug 3, 2011
at 12:17 PM, Neill Ellis <span><<a
moz-do-not-send="true"
href="mailto:tgsnoopy@gmail.com">tgsnoopy@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin: 0 0 0 .8ex; border-left:
1px #ccc solid; padding-left: 1ex;">Hi
Grunter,<br>
<br>
I think you might be on to something. I'm
pretty sure the media would have let us
know if Ambo's were trialling or had gone
secure digital.<br>
<br>
Regards,<br>
<br>
Neill.
<div>
<div><br>
<br>
<br>
On 3/08/2011 11:50 a.m., Grant Carroll
wrote:<br>
</div>
</div>
<blockquote class="gmail_quote"
style="margin: 0 0 0 .8ex; border-left:
1px #ccc solid; padding-left: 1ex;">
<div>
<div>Hello,<br>
I am still listening to ambos on the
same frequencies in the ESB band
they have been on for ages. This is
on an analogue scanner and my
digital scanner with no "P25" coming
up to suggest the transmissions are
digital and obviously if I can hear
them on an analogue scanner they
aren't. Am I missing something here?
Are they being simulcast on analogue
and new digital frequencies for now
or is their going digital just a
vicious rumour?<br>
Cheers guys.<br>
Grunter1.<br>
<br>
<br>
</div>
</div>
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