[Elecraft] KSB2 Problem: Big attenuation of received signals

[Andrew Meier]

My first post, this is regarding my attempt to install
the KSB2 option into my K2/100 #4363. 

I built the KSB2 option, and removed C167 and the two
jumpers from the RF board, plugged in the KSB2 board,
applied power, and got the "Elecraft" on the display. 


The problem is that the receiver became very quiet. I
could still hear the strongest signals if I turn the
AF Gain way up, and instead of S9 on the meter,
they're way down to S1. The KSB2 manual specifically
states (page 15, final step of "initial test") this
should not happen, and if it does, to go to the
troubleshooting section.  I confirmed about half of
the DC measurements in the troubleshooting section. I
noticed when I jiggle around RFC2 I get some noise in
the receiver, and those little RFC1 & 2 toroids on the
KSB board were a challenge to wind, so I'm wondering
if I have a problem there. 

I removed the KSB2 board, put the jumpers and the C167
back into the RF board, and now I am back to my
well-performing K2/100. 

The KSB2 board is sitting on the bench waiting to be
fixed.

Have any of you seen receiver attenuation problems
when you first plugged in the KSB2? What was your
solution? 

Thanks,
-Andrew, KF7HB




		
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