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TS430S.2
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1990-08-27
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TS430S.2
FROM: N0HME
SUBJECT: TS430 NOISE BLANKER MOD
--QRX!--
--LOADING (12)--
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