[TheList] Northland Police data noise

Sun Jul 31 20:10:15 AEST 2016

I have to admit, it was me that installed that system. About 10 years
before I retired 15 or so years ago.  The telemetry transmitters are at
each repeater site, a  number of them. They come in 2 Flavours, analog and
completely digital. Analog ones also support the digital 'channels' that
the digital transmitters send, ie 'ÒN' and 'OFF' . Analog ones also send
battery voltage via a analog to digital converter. It is a really simple
system, 300 baud from memory, based on AX25 protocols. All TTL so fairly
old now. Ďecoding would be worthless - you would have to know what each
channel means. I have forgotten.

Ian

On 31/07/2016 9:27 PM, "Chris Hoffmann" <chris021 at gmail.com> wrote:

> I have always thought it was battery levels from solar repeaters, but have
> never tried to decode it.
>
> On 31/07/2016 8:40 PM, "DogSecurity - Richard" <richard at dogsecurity.co.nz>
> wrote:
>
>> Hey guys,
>>
>> I was up in Whangarei last night doing some geocaching (could have picked
>> a better weekend....) anyway each time I've gone up, when I've been
>> listening to the police channels, I sometimes hear some type of data tone.
>> It's obviously some type of SCADA/data transmission although I can't pick
>> what it is just by listening. What I'm curious about is... what is it for?
>> are they monitoring a remote solar site for battery stats?
>>
>> Cheers,
>>
>> Richard / Z-master
>>
>>
>>
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