TS430S.2

FROM: N0HME
SUBJECT: TS430 NOISE BLANKER MOD

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 KENWOOD TS-430 NOISE BLANKER MOD     

 ON THE RF UNIT X44-1510-XX CHANGE THE

 FOLLOWING COMPONENTS:

  1-CHANGE R80 TO 100K 1/4 WATT RESISTOR.

  2-CHANGE R81 TO 56K 1/4 WATT RESISTOR.

  3-CHANGE C125 TO A 560 PF 25 VOLT DISC CAPACITOR.


 NO REALIGNMENT IS REQUIRED        

 KENWOOD TS-430 AGC MOD 

   THE TYPE OF SPEECH PROCESSOR

 CIRCUIT USED IN THE TS-430 IS AN AGC

   (AUTOMATIC GAIN CONTROL) DRIVEN AUDIO FREQUENCY AMPLIFIER. 

   BY DECREASING THE TIME CONSTANT SUBSTANTIALLY, THE SPEECH PROCESSING

   EFFECT WILL BE IMPROVED.

   THE MODIFICATION IS VERY SIMPLE.

   REPLACE CAPACITOR C104 4.5 UF ON THE IF BOARD BY A SMALLER  
   VALUE OF O.47 UF. 



 TO MODIFY THIS CAPACITOR

  1-REMOVE THE IF BOARD AS INDICATED FOR THE CW FILTER INSTALLATION.

  2-REMOVE C104 FROM THE BOARD. 

  3-MOUNT A 0.47 UF CAPACITOR ON THE BOARD. 

  4-MOUNT THE IF BOARD AS INDICATED BY CW FILTER INSTALLATION. 

  5-YOU ARE NOW FULLY OPERATIONAL AGAIN. 

  6-ADJUST THE MIC GAIN WITHOUT THE PROCESSOR UNTIL NORMAL ALC    
 
  DEVIATION. 

  7-SWITCH THE PROCESSOR ON AND ADJUST VR7 NEAR C104 UNTIL NORMAL 
 
  ALC DEVIATION. (DO NOT ALTER THE MIC GAIN AT THIS TIME) 

  8-ENJOY THE SPEECH PROCESSOR IMPROVEMENT. 

 FROM KF4NJ JOHN............RELAYED   BY...N0KGX..GENE