Re: RF Immunity in Smoke Detectors

[SeanS <alarmdude01@xxxxxxxxx>]

Russell Brill wrote:
> "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...
>
>
I was thinking HF and 10 & 15 was probably it as well.