XPost: alt.comp.os.windows-10, alt.home.repair, sci.electronics.design   
   From: wwm@wwmartin.net   
      
   On 1/2/23 07:01, Phil Hobbs wrote:   
   > John Larkin wrote:   
   >> On Sun, 1 Jan 2023 22:14:49 +0100, "Carlos E.R."   
   >>  wrote:   
   >>   
   >>> On 2022-12-25 22:12, micky wrote:   
   >>>> sci.electronics.design added.   
   >>>>   
   >>>> 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?   
   >>>   
   >>> If I remember correctly, each amplifier stage inserts a delay and a   
   >>> phase shift in the signal it processes.   
   >>   
   >> Microseconds. Equivalent to a tiny fraction of an inch at sound   
   >> propagation speed.   
   >>   
   >>>   
   >>> Each capacitor or coil inserts a phase difference between voltage and   
   >>> current.   
   >>   
   >> Tiny.   
   >>   
   >>>   
   >>> So, you can assume that if they are the same model, the should be in   
   >>> phase. Not trivial to calculate.   
   >>>   
   >>>   
   >>> Then, if the distance to the transmitter is one half wave lenght, there   
   >>> will be a 180 phase difference in the high frequency arriving.   
   >>   
   >> Which won't affect the audio.   
   >   
   >   
   > That's all true for AM, and mostly true for FM, but not for SSB.  The   
   > BFO phase comes out in the audio signal, so the audio phase will vary at   
   > infrasonic or low-audio rates.   
   >   
   > Cheers   
   >   
   > Phil Hobbs   
   >   
   Infrasonic? OIC... we need a SSB decoder for radio bigfoot!   
      
   --- SoupGate-Win32 v1.05   
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