Electronics

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Some pro's "pretend" and say that wireless alarm system are certified
and due to that Radio Frequency Interference (RFI) protected, lets put
it in the right context.

Let's show that the equipment certification process has nothing to do
with RFI protection and detection.

What is covered during equipment certification?

1. Equipment Radiation
All "internal generated unwanted" Radio Frequency (RF) signal
produced by most equipment's is tested during certification and
have to be under an external measurable signal level defined by the
ElectroMagnetic Compatibility (EMC) tests with typical certified
(CISPR requirement) measuring devices.

2. Equipment Immunity
Equipment's have to satisfy a second part of EMC certification,
they have to undergo tests to show they're immunity against
Radio Frequency transmissions generated by equipment as here above
in item 1.

3. RF Receiver immunity test (?)
There is NO external Radio Frequency Interference (RFI) signal
immunity or detection test for "receivers".
The receivers have been designed to capture specific signals
emanating from the sensors (transmitters) and are designed to
reject unidentified sensor signals but can't avoid unwanted signals
to reach them and jeopardize they're operation when they are
generated in a continuous manner on the receiver frequency (no
identification).

This being said:
- there is no certification test for RFI "immunity" caused by
RF transmitters as mentioned previously;
- there is no certification test for RFI "detection".

Professionals say that some "newer" systems detect interferences on
Wireless alarm system by stating features not designed and supported
by the manufacturer for that specific purpose!!!
Professionals claim they had no interference detected during the last
20 years on 1000+ systems!!!
That's for me at least a good prove that RFI is not detected, the
system goes "bingo" and nobody knows.

An eventual RFI detection doesn't solve the muzzling problem of RFI.
Just imagine what will happen when an interference occur in a suburb
where several Wireless alarm systems are present and an interference
is generated and detected...
Happy nightmares dear owners.

Paul

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