[Elecraft] KSB2 ALC Mod

Roy Morris w4wfb at carolina.rr.com
Tue Aug 15 10:22:35 EDT 2006


Some time ago I installed the PN2222 amp mod to my KSB2 board to increase the 10 meter SSB output on my QRP K2.  Later I added the KPA100.  John (KI6WX) said the KSB2 amp mod was no longer needed since adequate output is obtained on 10 meters.  I have since removed this PN2222 amp mod.
However, at the time I had the mod installed I had to do another mod suggested by Gary Surrency to keep the balanced modulator from overdriving the ALC when using PTT.  This KSB2 mod replaces R9 with a 1.5K resistor and a 1K resistor is placed across a cut trace between Q1's base and pin 6 of P1 connector.  I am wondering if I should undo this mod since I no longer have the PN2222 amp mod.  I am not aware of any adverse effect on my SSB signal.   Roy Morris  W4WFB
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