Thanks for the ideas Tim. I had considered that the telephone might be the
source and will try your idea. The sensors are all wireless and are battery
powered. To date none of the batteries have been replaced leading me to
wonder if maybe one is getting low which could account for the RF problem
only recently surfacing.
Don VE3XD
-----Original Message-----
From: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] On
Behalf Of N3XX - Tim Heger
Sent: July-06-08 6:41 PM
To: rfi@contesting.com
Subject: Re: [RFI] RFI in home security system
I would first disconnect the telephone line and then xmit to see if the
alarm goes off. If not, maybe the problem is the telephone line. Then
would leave the telephone line disconnected while doing more testing, to
avoid false alarms to the monitoring service. Next, try disconnecting the
wires in the alarm control box coming from each sensor, one at a time, and
xmit again each time to see if the trouble is coming from the one that is
disconnected.
If the sensors are wireless, they must be powered somehow. How about
removing the power to each one, one at a time, and testing with each sensor
not powered?
GL - 73,
Tim - N3XX
----- Original Message -----
From: "EP Swynar" <gswynar@durham.net>
To: "Don Cassel" <doncassel@rogers.com>; <rfi@contesting.com>
Sent: Sunday, July 06, 2008 3:39 PM
Subject: Re: [RFI] RFI in home security system
> Hi Don,
>
> I have a similar issue here with our system --- only in my case it's
> 80-meters that is the "bad" band, limiting me to no more than 100-watts,
> or
> so, of output power there...
>
> I'm sure it's all just a matter of unfortunate wire length to one of the
> intrusion sensors, creating a resonance on the affected band...but which
> lead, and how best to defeat the resonance without compromising the
> security
> system...?
>
> ~73~ Eddy VE3CUI - VE3XZ
>
>
> *****************************************
>
>
> ----- Original Message -----
> From: "Don Cassel" <doncassel@rogers.com>
> To: <rfi@contesting.com>
> Sent: Sunday, July 06, 2008 3:32 PM
> Subject: [RFI] RFI in home security system
>
>
>> Just recently I have been setting off my security alarm when operating 40
>> meters. The system has been in use for almost 4 years and previously
>> there
>> has never been any problem with RFI. The system is an ADT with a Focus 32
>> control unit. The control unit is wired to a keypad but all security
>> checkpoints, ie. doors and motion sensors are wireless. The 40m antenna
>> is
>> an Alpha-Delta DX/DD configured as an inverted-vee one leg of which
>> passes
>> over the house. I never run more than 200 watts as this is the maximum
> that
>> the Yaesu Mark V can produce.
>>
>> Generally the problem occurs only at the low end of 40 in the CW and RTTY
>> portion of the band. Nothing in my station or in the security system for
>> that matter has changed but obviously something has. Ideas would be
> welcome.
>>
>> Don VE3XD
>>
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>
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