home bbs files messages ]

Forums before death by AOL, social media and spammers... "We can't have nice things"

   sci.electronics.repair      Fixing electronic equipment      124,925 messages   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]

   Message 123,310 of 124,925   
   micky to All   
   Will two table radios always be in phase   
   25 Dec 22 13:34:00   
   
   XPost: alt.comp.os.windows-10, alt.home.repair   
   From: NONONOmisc07@fmguy.com   
      
   Technical qustion about wave valleys and troughs and if two radio   
   playing the same station will be in phase wrt all frequencies, or if   
   some will cancel out?   
      
   And why is it low frequencies are famous for cancelling out when out of   
   phase when high frequencies are just as likely, 0.5, I think, to cancel   
   each other out?   
      
   Can I just turn off one radio and turn it on again so that the total   
   odds over both times have increased that by the second time the radios   
   will be in phase?   
      
      
   I have a radio and tv in one bathroom but neither in the other, which is   
   smaller and adjoins the bedroom.  Sometimes I want to hear the radio   
   which only gets 'loud' if you are in the same room. I can hear it from   
   the bathroom but not enough to understand what is said.   
      
   I have another table radio, KLM, expensive, that I had for about 33   
   years when the speaker switch started to fail**, and I turn that one on   
   too, to the same station, also at maximum volume, and I can hear in the   
   bathroom just fine, but I wonder if some frequencies are out of phase   
   from one radio to the other, cancelling each other, and I'm not hearing   
   them.   
      
   It seems to me, if one radio is farther from the transmitting antenna,   
   by 1/2 wave length, the speakers in the two radios will always be going   
   in the opposite direction from each other.  Maybe.   
      
   In my case, the radios are one above the other, so the distance from the   
   xmtr is very similar.   But what about within the radio, when the   
   heterodyning frequency starts.  What if it starts have a cycle after the   
   first radio?   
      
      
      
   **So I bought the second radio.  The first one has a pushbutton switch   
   meant to connect/disconnect a wooden-cabinet stereo speaker, which I   
   have no room for, and unless I get the switch just right, no sound comes   
   out at all.  (even the on/off momementary contact switch no longer works   
   well, after only 33 years, maybe using it at most 6 times a day, so that   
   6x365x33=66,000 times.  Aren't switches supposed to last into the   
   millions of times?  --- It's failing isn't nearly as bad, because I just   
   keep pushing until it works.  The speaker switch OTOH has a spring that   
   pushes it out, past its sweet spot, so now it's hard to get to connect   
   at all.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]


(c) 1994,  bbs@darkrealms.ca