[TheList] APCO25

Sat Apr 23 18:35:13 AEST 2011

I remember trying to set up a VESDA system at a TV site in OZ - far north
Queensland.   When it went off it opened the main MCB and took out the whole
site, several commercial TVs and lots of FMs. Took us ages to figure out
there was a bushfire something like 20KMs away causing the smoke. Quick
solution to sample the outside air first...
Denis

-----Original Message-----
From: thelist-bounces at radiowiki.org.nz
[mailto:thelist-bounces at radiowiki.org.nz] On Behalf Of Neill Ellis
Sent: Saturday, 23 April 2011 7:37 p.m.
To: zl1cop at qsl.net; thelist at radiowiki.org.nz
Subject: Re: [TheList] APCO25

LOL, or High Power on HF to set off Burglar Alarms. One of the local 
rouges hammered Tauranga to the point that just about all the alarms 
were replaced with newer equipment that had better immunity. 
Occasionally he'd go over to Rotovegas or Hamiltown and cause caos over 
there.

Then there was the VESDA Fire Alarm in the telephone exchanges, 
temperamental at the best of times. Fire would check, reset the system 
etc. Last thing they'd do was call up on their handportable to say it 
was all good and they were on their way. Of course the burst of RF from 
that call just outside the door would often set it off again.

Those were the days.

Thanks for the stroll down memory lane Andy :-)

Regards,

Neill.

On 23/04/2011 5:30 p.m., Andy wrote:
> If that catches on it would be a great unintended benefit of the digital
> radio system.
> Imagine, all you have to do is press the mic button and every speeder
within
> range hits the brakes!!
>
> Reminds me of bit of some harmless fun indulged in by some young
constables
> back in the early 80s when space invader machines were the latest
attraction
> at the local takeaway.
> These machines were a magnet for the local "yoof" on a Friday night,
before
> they moved on to their normal activities of syphoning gas and roaring
around
> pissed in mk2 Cortinas. It didn't take long to establish that the radio
> suppression on these devices was not very effective to say the least. A
> quick burst of 25 watts of carrier at around 78MHz from the innocent white
> HZ Holden parked across the road was sufficient to blank the screen and
> reset the machine so it said  "Game Over - Insert 20 cents ".  It was
> amazing how much money they would feed it before realizing that something
> was going on, especially if you gave them a couple of minutes of play
before
> hitting the button again. Every time they complained to the takeaway guy
it
> worked perfectly when he tried it. They never figured it out.
>
> Andy
>
>
>   -----Original Message-----
> From: Mike Barnes (ZL3TMB) [mailto:zl3tmb at ihug.co.nz]
> Sent: Friday, 22 April 2011 10:35 a.m.
> To: zl1cop at qsl.net
> Subject: RE: [TheList] APCO25
>
> I know to slow down, and keep the $$ in my pocket :)
>
> -----Original Message-----
> From: Andy [mailto:zl1cop at qsl.net]
> Sent: Friday, 22 April 2011 12:04 a.m.
> To: 'Mike Barnes (ZL3TMB)'
> Subject: RE: [TheList] APCO25
>
> "A simple P25 buzz warns of the police near by....."
>
> And then what?
>
>
>
> -----Original Message-----
> From: Mike Barnes (ZL3TMB) [mailto:zl3tmb at ihug.co.nz]
> Sent: Thursday, 21 April 2011 11:00 p.m.
> To: thelist at radiowiki.org.nz; zl1cop at qsl.net
> Subject: RE: [TheList] APCO25
>
>
> Hmmmmm, so if I enter all these frequency as mobile inputs in my scanner
> with a very poor antenna.
> I've just created the best radar detector ever :)
>
> A simple P25 buzz warns of the police near by.....
>
>
http://www.rsm.govt.nz/cms/pdf-library/resource-library/publications/pib-23/
> PIB23-Issue-6.pdf
>
> The simple ideas are the greatest.. :)
>
> Have fun.....
>
>
> Andy wrote:
>> Current state of play:
>>
>> Following freqs in the Auckland area observed as active with APCO P25
>> trunking data:
>>
>> 141.1500
>> 141.1750
>> 141.2625
>> 143.2750
>> 143.3500
>> 143.3625
>> 143.3750
>> 143.3875
>> 143.4375
>> 498.5125
>> 498.5250
>> 498.5625
>> 498.6375
>> 498.6625
>> 498.6750
>> 498.6875
>> 498.7000
>> 498.8125
>> 498.9875
>>
>> cheers
>>
>
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