[Elecraft] Smoke detectors

[Jim Miller]

Every AHJ is different. Find out what yours says.

Jim ab3cv

On Thu, Oct 29, 2020 at 10:16 PM Hank via Elecraft <elecraft at mailman.qth.net>
wrote:

> We switched to wireless alarm connected, internal battery detectors due to
> the occasional RFI interference caused by running a little power on 80
> meters. Our alarm company actually had some experience with RFI issues and
> made the recommendation. I installed them and have a calendar reminder to
> swap the batteries every fall when the time changes.
>
> Local fire code does not require detectors. Insurance folks give us a
> break on rates for having them - wired or otherwise here in Ga.
>
> Hank
> K4HYJ
>
> > On Oct 29, 2020, at 5:36 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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