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     1. 03:15 PM - Re: Radio interference (jetboy)
 
 
 

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Time: 
03:15:14 PM PST US
Subject: 
Re: Radio interference
From: 
"jetboy" <sanson.r@xtra.co.nz>
      
      
      Updated the plots at
      
      http://groups.yahoo.com/group/jabiruengines/files/Radio%20noise/
      
      I also did  bench testing; adding an R type plug and distributor spark gap to the
      setup to more closely represent the situation on a flying engine.
      
      I could only observe the noise with the R plug on an older analyser (no plots available),
      however the noise reduction was a significant improvement over the
      normal plug and inductive lead combination (-5 dB).
      
      The pulse observed at the coil output lead was not significantly higher when using
      a R plug; but it was higher with increased plug gap settings. 
      
      I now have no concerns about R plugs affecting coil reliability provided the specified
      gap is maintained. NGK DR9EIX is probably the best option.
      
      If the inductive suppression lead is only available with low resistance (less than
      1 K) then fitting R plugs would seem a good option.
      
      Ralph
      
      --------
      Ralph - CH701 / 2200a
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=92699#92699
      
      








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