Jim Brown wrote:
>On Sat, 09 May 2009 12:28:05 -0700, Michael Tope wrote:
>
>
>
>>Anyone know any home security equipment dealers who are hams or who
>>know anything about EMI/EMC?
>>
>>
>
>No experience with these guys, but security systems are notorious
>for RFI susceptibility. FWIW -- that 300 MHz range is commonly used
>for garage doors and remote control of A/V systems. I don't know of
>instances of RFI to the RF functions, but expect problems with RFI
>to other circuitry. The usual fixes are twisted pair wiring, caps
>across wiring from dry contacts, and chokes to kill common mode.
>
>73,
>
>Jim K9YC
>
>
>
Hi Jim,
The feedback I am getting suggests the wireless systems are superior to
the wired systems in terms of EMI-EMC. This is not surprising since your
are getting rid of long lengths of twisted pair wires when you go with a
wireless sensor system. I don't need to tell you that it is those wires
where the trouble often comes from.
73, Mike W4EF.................
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