Re: RF Immunity in Smoke Detectors

["Russell Brill" <russwbrill@xxxxxxxxxxxxx>]

"SeanS" <alarmdude01@xxxxxxxxx> wrote in message
news:dnZXg.70$9z6.36@xxxxxxxxxxx
> Russell Brill wrote:
>> Use shielded cable between the Smoke(s) and the control... In most cases,
>> the wiring acts as an antenna feeding RF into the detection device or the
>> control (sometimes BOTH)............ Regards, Russ
>>
>> "Eyeball Kid" <jimbo1@xxxxxxx> wrote in message
>> news:EwXXg.42$AU6.33@xxxxxxxxxxxxxxx
>>> I have a customer who is an amateur radio operator and is complaining
>>> that whenever he is transmitting he trips the smoke detector we
>>> installed (System Sensor 2012HA).  He is asking for a smoke that is
>>> better designed for RF Immunity.
>>>
>>> Almost all the motions I have seen have some spec listing RFI  (typicall
>>> 30v/m 10-1000Mhz)  but I have not found any such spec on any of the
>>> smokes I have looked at.  (System Sensor, GE-Interlogix, DSC)
>>>
>>> Anyone have any suggestions for a smoke detector in a RF rich
>>> environment?
>>>
>>> Anyone done an install at a radio station (the transmitter not the
>>> studio) and what did you use?
>>>
>>
>>
> Russ has some good starting advice. As an amateur radio operator Im
> curious as to what band he is transmitting on when this occurs.

Probably HF, 10 (28MHZ) & 15 (21MHZ) meters were the hardest to keep out of
tvs, cheap phones, stereos etc.. One big problem some Hams create for
themselves when it comes to RFI, mounting HF antennas in their (This is done
because of CC&R's that restrict outside antennas) attics... There's nothing
like radiating a 100+ watt 28MHZ signal 6ft away from all of your Low & High
voltage wiring...