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705gain [2007/05/20 20:44] (current)
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 +====== Model 705 Microphone Gain Mod ======
 +**From the Ten-Tec Reflector December 21, 2000**
  
 +I made some changes in mine.  It was done in an effort to solve, what I thought was an RF problem, but in doing so, I found that I got better audio reports.  ​
 +
 +Change R1 from 100K to 68K.  Change C4 from 220pf to 330pf.
 +
 +This does reduce the gain of the mic pre-amp stage and maintains the same frequency compensation. ​ The result is that the input to the 1st stage of the Omni VI+ is reduced and (it was my determination) that the front end audio clipping was eliminated. ​ After the modification,​ the Omni mic level control must be advanced to about the 10 to 11 o'​clock position. ​ (Normally it runs about 9 o'​clock) ​ The mic level control is electrically located between the 1st and 2nd stages.  ​
 +
 +73\\ 
 +Bob K4TAX

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