XPost: alt.home.repair, sci.electronics.repair   
   From: ianREMOVETHISjackson@g3ohx.demon.co.uk   
      
   In message , Bob M.   
    writes   
   >"Jeff Liebermann"  wrote in message   
   >news:m9bad5l68mh8jh9jbe1cdlufqem3fs6f9c@4ax.com...   
   >   
   >>   
   >> It's not just weather stations.  It's any kind or thermometer that   
   >> uses wireless for communications.  Most of them are on 433.925Mhz.   
   >> Also remotes for air conditioners, room lighting, door locks, vehicle   
   >> alarms, vehicle keys, SCADA systems, and mess of other gadgets that   
   >> involve key fobs and very low speed/thruput wireless data.  Just enter   
   >> "433.925" into a Google search for some hints.   
   >   
   >Also add "ham radio" to that list. 420-450 mHz is a popular ham radio band.   
   >   
   >The same 420-450 mHz band is where the US Air Force's "Pave PAWS"   
   >radars operate; they have a range of over 3,000 miles. Located at Otis   
   >AFB, MA, Beale AFB, CA and Clear AFS, AK, these radar beams extend out   
   >over the ocean, primarily.   
   >   
   >And, does the OP's house have metal siding?  Metal siding greatly   
   >reduces the penetration of the transmitter signal to the inside the   
   >house.  I had steel siding at the old place & this one; the old place   
   >had wireless doorbells that didn't always work, even with new   
   >batteries. This place has wired doorbells that always work.   
   >   
   >The OP's remedy is to install wired doorbells.   
      
   Don't forget that these wireless devices are "made to a price". They   
   usually employ the minimum amount of circuitry which enables them to   
   function. They may respond to an RF signal on almost ANY frequency,   
   provided it is strong enough. It doesn't have to have the correct coding   
   etc.   
      
   Of course, 'electronic' wired devices (even those where no 'frequency'   
   is involved) also can also suffer from RF interference. But a purely   
   'electrical' device - like a doorbell - should be OK.   
   --   
   Ian   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)