On 10/22/2014 7:47 AM, Mike Ryan wrote:
ANY amount of HF rf would set it off.
The alarm industry is notorious for ignoring RF susceptibility. When the
RF is coupling via wiring from dry contacts in the form of a simple
on/off, a cap across the input of the receiver will generally fix it. If
the interconnect is sending data, a cap will likely kill the data. Mfrs
often tell their users to use parallel conductor wiring for
interconnects, which makes them more susceptible to differential mode
RFI. They SHOULD be using good twisted pair, which strongly rejects
differential mode coupling.
73, Jim K9YC
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