[Elecraft] Smoke detectors

[Jim Miller]

Strongly suggest contacting county fire marshal before selecting wireless
only detectors.

You don’t want to violate code and have any insurance claim denied if these
is an event.

Jim ab3cv



On Thu, Oct 29, 2020 at 5:38 PM Jim Brown <jim at audiosystemsgroup.com> wrote:

> Most RFI to/from ham radio and "devices" is caused by poorly designed
> electronics using interconnected wiring as TX/RX antennas. Because of
> the frequencies on which they operate, WiFi-connected devices with no
> exterior wiring are inherently FAR less likely to create or receive RFI
> IF they operate on internal batteries. If running from the AC line or a
> switching power supply (wall wart, wall lump, etc.) the PSU will almost
> certainly create RFI noise and wiring both on the AC and DC side will
> radiate it.
>
> Bottom line -- choose stand-alone devices with internal batteries and no
> external wiring for minimum RFI.
>
> In your situation, I would try one of them before returning them.
>
> 73, Jim K9YC
>
> On 10/29/2020 12:57 PM, Harlan Sherriff via Elecraft wrote:
> > Dave, I totally agree. I am sure the “problem” the manufacturer is
> cautioning about is RF, since my original post was about “wireless
> connected” detectors. My gripe was nothing in the sales literature warned
> against it. Not till I bought the units and read the installation guide
> >
> > Sent from my iPhone
> >
> >> On Oct 29, 2020, at 3:51 PM, Dave B via Elecraft<
> elecraft at mailman.qth.net>  wrote:
> >>
> >> Well, RF (AKA "Radio Waves") can falsely trigger all sorts of equipment
> >> that was not "designed" to work with, or be influenced by them.
> >>
> >> That is the classic EMC Susceptibility or Immunity problem.  Basically,
> >> poor design and/or implementation of the affected (or sometimes bad
> >> installation of an otherwise good) device.
>
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