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<p>No they don't talk with Police directly.. their control room may,
but I understood that the decision was made that ONLY Police have
Police radios on the P25 network. From this, I don't believe any
Community Patrols will have them in the future, and that the CHCH
control room won't have one. <br>
</p>
<p>I would assume that if Police sell their CHCH P25 repeater
equipment to the NGCC, that AvSec (they're a government department
aren't they? I don't remember) will move to P25, given there's a
P25 UHF repeater at the Airport. <br>
</p>
<p>Obviously take what I say with a grain of salt though, I don't
really have any inside knowledge.<br>
</p>
<p>Darryl - Yes, Corrections are encrypted, they're on CapPlus or
CapMax, I forget which it is. I was told, when we did the
Tongariro site, that the current LTR sites were all moving
across.. LTR is an old system - of course, that was several years
ago, back then NGCC was just a twinkle in someones eye, and I
still feel that they'll not go across to P25 given how much
they've spent moving several prisons over to DMR, and that they
want site only dcoverage... It's certainly possible that the
prisoner transport vehicles would go over to P25.<br>
</p>
<div class="moz-cite-prefix">On 21/03/2022 10:33 am, Radio
Engineering wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFp_d1nOOF+Y3T+WCeDXoWMVQP1vNhgbuZZ08_P38ZjiGYeU9A@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">Community patrol are encrypted? What the heck for?
They do a good job, but their coms is mostly run of the mill
stuff - nothing that requires secrecy.
<div dir="auto">I presume they have a handheld P25 radio to
communicate with police as well?</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, 20 Mar 2022, 21:27
Darryl Healy, <<a href="mailto:darryl0768healy@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">darryl0768healy@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto">I assume corrections DMR will obviously be
encrypted also?
<div dir="auto"><br>
</div>
<div dir="auto">For those that don't know Chch INTL aviation
security are on the Orion CON+ network and it works well
for them having regional wide coverage and a repeater
setup at the airport itself.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Also all of chch intl is on this network
including airport crash fire which aren't encrypted along
with all the airline, servicing and cleaning comms.</div>
<div dir="auto"><br>
</div>
<div dir="auto">There is alot of interesting stuff on the
Orion network including community patrol which have just
gone encrypted.</div>
<div dir="auto"><br>
</div>
<div dir="auto">The network caters for hundreds of companies
from florists, couriers, truck companies to alot of
council work and then some...</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, 20 Mar 2022, 14:18
DogSec - Richard, <<a
href="mailto:richard@dogsecurity.co.nz" target="_blank"
rel="noreferrer" moz-do-not-send="true"
class="moz-txt-link-freetext">richard@dogsecurity.co.nz</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<p>Hard to say... but most likely that will be the
case, yes you'll no longer hear police.<br>
</p>
<p>The Government is bringing in NGCC (Next Gen Critical
Communications) network which will be P25, Cellular
and IP based telecommunications setup, similar to
Australia, America, etc. The ESA/UHF analog networks
will be shut off. <br>
It will have Police, FENZ, St John, WFA, and possibly
CivDef etc. It's possible that some or all of it will
be encrypted, that will be up to each orgainization.
I'd imagine that it will follow along with the current
Auckland, Wellington, Wairarapa and Canterbury setups
where Police are encrypted. But that could change as
happened in Victoria on the MMR/RMR networks
(basically speaking MMR is UHF, RMR is VHF) where
Ambulance were unencryped, but that's changed and is
now encrypted.. Encryption is done on the subscriber
unit - P25 supports encryption. <br>
</p>
<p>The current P25 network I understand to be owned by
the Police, this new network will not be. I would
assume that the Police will sell their equipment so
they no longer have to worry about the repeater
networks falling over, that would become the NGCCs
problem, but they would keep their current radio techs
as they still need people on the ground looking after
vehicles/handhelds... I will also assume that NGCC
won't have any interest in dealing with subscriber
units as it's a lot to manage - they'll have enough on
their plates to deal with, running a national trunking
repeater network. I also assume that Police will want
to keep their codeplugs close to their chest.
FENZ/Police have their own radio techs, so it'd be
business as usual for them, except no more repeater
work - they're multi talented in that they do radio,
telephony and IT stuff. St John use Vital for
repeaters, but contract Tait to subcontract radios,
each Civil Defence area seems to do their own thing
for radio work. I don't know much about WFA other
than they use a couple of talkgroups on the Wellington
P25 network. Others that could join would be
government departments... Aviation Security, MBIE
(Immigration etc) I will assume that Corrections
will remain as they are with their current LTR setups
that are moving over to DMR as they really need prison
specific coverage, and keep the prisoner transport
vehicles on Vital.<br>
</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<div>On 20/03/2022 1:24 pm, Tim Devaney wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">Are we not going to be able to receive
the police soon ?? </div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Mar 20,
2022, 12:09 DogSec - Richard <<a
href="mailto:richard@dogsecurity.co.nz"
rel="noreferrer noreferrer" target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">richard@dogsecurity.co.nz</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<p>Hi BJ,</p>
<p>Years ago someone did a write-up about it on
here, but basically it's a form of SCADA for
monitoring sites remotely. Some sites are
often not easy to get to and may have access
issues such as being helicopter access only.
These sites have quite large battery banks, as
mains power may be flaky. The SCADA allows
for inputs and outputs to be monitored
remotely. They are often polled at specific
times, which is why sometimes you may hear the
tones underneath voice comms. If the
controller polls and doesn't get a response
back then it will retry X amount of times (if
programmed) then assumes the site is dead, and
alerts get generated. A variety of things can
be monitored. Often these are only 'analog'
inputs so you only get very specific
details.. You could see things like <br>
</p>
<p>Battery Bank A is 100/75/50/25% (maybe not
even in that much detail)<br>
</p>
<p>Generator On/Off</p>
<p>Entry Door OPEN/CLOSED <br>
</p>
<p>Alarm ACTIVATED/DEACTIVATED/IN ALARM <br>
</p>
<p>SOLAR ON/OFF (IE is there voltage coming into
the system on the Solar lines) <br>
</p>
<p>REPEATER POWER ON/OFF (some repeaters can
have an output that's activated when it's in a
certain state) As Daryl mentioned, it would
be a (probably unreliable) way of determining
if a repeater is working or not.<br>
</p>
<p>With the NGCC being implemented, a lot of
this will eventually become redundant as most
things like SCADA would be converted to IP
based, and digital radio is also IP based,
meaning a lot of this could be sent over a
text message over the radio network. I assume
P25, but DMR will prioritize voice over
messaging.<br>
</p>
<p>As for the screeching, lots of factors could
be causing that. I-band links shouldn't
really be used for monitoring as they're only
point-to-point or point-to-multipoint links
meaning you really need to be in line of the
path for it to be received. I'd recommend use
the VHF/UHF frequencies. Once again, with
things turning to digital soon, they'll
probably be redundant with the links will be
done over IP.<br>
</p>
<p>Cheers,</p>
<p>Richard</p>
<div>On 20/03/2022 11:23 am, Darryl Healy wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">Those tones are something to
do with the linking with all the VTGs.
<div dir="auto"><br>
</div>
<div dir="auto">They happen every 4 hours at
midnight and so on.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Someone will no doubt give a
more technical explanation of them soon.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, 20
Mar 2022, 11:01 BJ, <<a
href="mailto:bjcuizon151@gmail.com"
rel="noreferrer noreferrer noreferrer"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">bjcuizon151@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">
<div dir="ltr">Hi all,
<div><br>
</div>
<div>Was in Dunedin recently and tuned
in to police comms. Anyone know what
those squawking tones on some police
channels are? It doesn't sound like
fire selcall but more like a really
short (~1 sec) burst of what sort of
sounds like a part of the old dial-up
handshake.</div>
<div><br>
</div>
<div>Also, was listening to firecom and
ambo thru the I-band link in Chch and
on some link channels there is a
really high pitched tone that is
present when someone keys up. It can
only be heard on a radio with no audio
filtering/DSP as my Tait seems to
cancel it out. Does anyone have an
idea what this is as well?</div>
<div><br>
</div>
<div>Thanks in advance,</div>
<div>BJ</div>
</div>
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