Thank you all for the responses and some good insight to this problem.
Those of you who have had similar problems, it doesn't sound like there was
much solution other than either total disconnect of the alarm system during
Ham time or extensive filtering (by trial and error) on the various control
lines,
This weekend, I intend to kill the house power and disconnect the backup
battery to make sure of this. Unfortunately, the alarm service out this
way has been generally uncooperative on most things. As much as I would
like to spend time trying to bypass the RFI with filters/chokes, it could be
coming from literally anywhere on any of the control lines to various
sensors and keypads throughout the house and my time of late has been very
limited, but I'll try maybe just at the main box itself and see what effect
some chokes have an the control lines.
One person suggested the Timewave ANC, which I looked at - it looks
interesting and could be just the thing, the 6db signal loss
notwithstanding. Heck, 6db isn't so bad considering the total loss of
signal right now on the low bands. Of course that isn't foolproof either
considering that you have to get the secondary antenna to actually pick up
the RFI.
I'll post the final results here for anyone who's interested in a follow-up.
Thanks again to all who responded.
73,
Marc, WB2JUF
> 1. Home Security System RFI (Marc Ornstein)
> [...]
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|