I have not searched for the frequency that ADT uses with a suitable spectrum
analyzer. I would guess it is using one of the part 15 bands - however
without measurements I do not know for sure.
73,
Tim K3LR
-----Original Message-----
From: W5JR.Mike [mailto:w5jr.mike@gmail.com]
Sent: Monday, July 30, 2012 3:58 PM
To: k3lr@k3lr.com
Cc: <jim@audiosystemsgroup.com>; <rfi@contesting.com>
Subject: Re: [RFI] RFI & Alarm Systems?
What frequency(ies) are these wireless secirity systems operating in - 434,
390, 902, 2400 MHz? And how are the sensors powered, via coin cells?
Since I operate 440 and 900 repeaters at my house as well as user radios,
I'm interested prior to installing. The wireless grill thermometer on 434
MHz and the remote outdoor temp sensor for the WX station roll over dead
when the UHF repeater (at 5w) comes up and it plays about 9 hours a day.
tnx
Mike
On Jul 30, 2012, at 11:31 AM, "Tim Duffy K3LR" <k3lr@k3lr.com> wrote:
> Hi Jim:
>
> Without pulling it apart - there is no way to identify the manufacture.
ADT
> has done a great job of keeping customers out of the inner workings.
>
> 73,
> Tim K3LR
>
> -----Original Message-----
> From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] On
> Behalf Of Jim Brown
> Sent: Sunday, July 29, 2012 10:55 PM
> To: rfi@contesting.com
> Subject: Re: [RFI] RFI & Alarm Systems?
>
> On 7/29/2012 8:50 PM, Tim Duffy K3LR wrote:
>> The ADT wireless alarm system I have used is totally RFI free.
>
> Tim,
>
> Can you identify by model number(s)?
>
> I suspect that the fact that they're using wireless sensors is part of
> why it works. I suspect most of the issues with other security systems
> is with horrific wired inputs to a central control unit (Pin One issues
> and non-existent bandwidth limiting), and their failure to tell their
> installers to use twisted pair.
>
> 73, Jim K9YC
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