[TheList] Squawking Tones on Police Channel & High Frequency Tone on Channel

Sun Mar 20 19:31:45 AEDT 2022

3088101

On Sun, 20 Mar 2022, 21:30 Oliver O'Connell, <nzoliver at outlook.com> wrote:

> Hi, what’s the community patrol talk group?
>
> Sent from my telephone.
>
> On 20/03/2022, at 21:27, Darryl Healy <darryl0768healy at gmail.com> wrote:
>
> 
> I assume corrections DMR will obviously be encrypted also?
>
> 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.
>
> 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.
>
> There is alot of interesting stuff on the Orion network including
> community patrol which have just gone encrypted.
>
> The network caters for hundreds of companies from florists, couriers,
> truck companies to alot of council work and then some...
>
> On Sun, 20 Mar 2022, 14:18 DogSec - Richard, <richard at dogsecurity.co.nz>
> wrote:
>
>> Hard to say...  but most likely that will be the case, yes you'll no
>> longer hear police.
>>
>> 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.
>> 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.
>>
>> 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.
>>
>>
>>
>>
>> On 20/03/2022 1:24 pm, Tim Devaney wrote:
>>
>> Are we not going to be able to receive the police soon ??
>>
>> On Sun, Mar 20, 2022, 12:09 DogSec - Richard <richard at dogsecurity.co.nz>
>> wrote:
>>
>>> Hi BJ,
>>>
>>> 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
>>>
>>> Battery Bank A is 100/75/50/25% (maybe not even in that much detail)
>>>
>>> Generator On/Off
>>>
>>> Entry Door OPEN/CLOSED
>>>
>>> Alarm ACTIVATED/DEACTIVATED/IN ALARM
>>>
>>> SOLAR ON/OFF (IE is there voltage coming into the system on the Solar
>>> lines)
>>>
>>> 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.
>>>
>>> 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.
>>>
>>> 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.
>>>
>>> Cheers,
>>>
>>> Richard
>>> On 20/03/2022 11:23 am, Darryl Healy wrote:
>>>
>>> Those tones are something to do with the linking with all the VTGs.
>>>
>>> They happen every 4 hours at midnight and so on.
>>>
>>> Someone will no doubt give a more technical explanation of them soon.
>>>
>>> On Sun, 20 Mar 2022, 11:01 BJ, <bjcuizon151 at gmail.com> wrote:
>>>
>>>> Hi all,
>>>>
>>>> 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.
>>>>
>>>> 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?
>>>>
>>>> Thanks in advance,
>>>> BJ
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>>>
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