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563upgrade [2011/10/07 11:43]
n1eu
563upgrade [2015/11/24 12:54] (current)
n1eu
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   *The later 564's have certain changes to top and bottom foil grounding on certain boards to improve 10M birdies which are a major problem with this rig.   *The later 564's have certain changes to top and bottom foil grounding on certain boards to improve 10M birdies which are a major problem with this rig.
   *The BPF filter on later 564's has a broadcast band mod to improve intermod in the presence of strong local AM BCB or SW signals. Night and Day difference on my rig.   *The BPF filter on later 564's has a broadcast band mod to improve intermod in the presence of strong local AM BCB or SW signals. Night and Day difference on my rig.
-  *An aftermarket mod from INRAD is available to improve the SSB audio response involving a swap of two component values. ​ This became a semi-approved factory mod. Stock audio is degraded by passing through the DSP chip when DSP is not engaged+  *An aftermarket mod from INRAD is available to improve the SSB audio response involving a swap of two component values. ​ This became a semi-approved factory mod. Stock audio is degraded by passing through the DSP chip when DSP is not engaged ​//(N1EU note: "high pass filtered"​ is a more accurate description than "​degraded"​ - see [[http://​omni6.wikidot.com/​rxaudio|Omni6 rx audio discussion]])//​
   *Later 564's use significant amounts of SMT construction   *Later 564's use significant amounts of SMT construction
  
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 **July 2011** //(comment from N1EU)// **July 2011** //(comment from N1EU)//
  
-In light of the improvements described above by N1LQ, I spent several ​hours comparing a 1992 vintage ​Omni 6 with a 2001 vintage Omni 6+ from the very last production batch (serial number 08XXXXX1 purchased in early 2002).  My conclusion ​was that any improvements in rx noise/​birdies was subtle, if at all audible.+N1LQ does a great job of tracing ​the 564 evolutionbut I'd like to offer up some comments: 
 + 
 +1.  I'​ve ​spent many hours of A/B comparisons of various vintages of Omni 6/6+ from 1992 to 2001.  My conclusion ​is that any improvements in rx noise/​birdies was subtle, if at all audible, and that the earliest units performed just about as well as the latest units. 
 + 
 +2.  The Inrad mod audio improvements are slight compared to the real problem, which is the audio dsp.  This is [[http://​omni6.wikidot.com/​rxaudio|discussed elsewhere]]. 
 + 
 +3.  In terms of the use of SMT in later units, the logic board, PBT board, Control board and IF/AF board all became SMT.  The 9Mhz Xtal Filter board was SMT from the start of production.  
 + 
 +4.  Changes were made in components in the product detector circuit on the IF/AF board of the Omni 6+ to improve intermod distortion over the Omni 6. 

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