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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