[Elecraft] CW Reverse Sideband Suppression Bad Using OP-1

[W7is at aol.com]

I  purchased a one year old K2 #5116.  Its equipped with the KSB2 SSB module. 
 
I  noticed the filter selection for CW Wide wasn’t set up with OP-1 as per 
the  
instructions for the KSB-2.    So I went into the Cal Fil  and set all the 
BFO  
settings exactly as per the KSB2 manual to  allow OP-1 to be used in place of 
FL-1 
on CW Wide.  Then I used the Spectrogram software to set the filters  exactly 
as per the instructions.   All the filters tuned up perfectly  . 
All  went well exact for one thing.    On CW Reverse,  using OP-1,  I can 
hear 
both sides of zero beat on the CW signals --- at  the same level.  So with an 
 S9 
signal I have to tune through  both sides of zero beat at S9 but  only using 
CW Reverse.   
e CW Normal using OP-1 has  prefect side band suppression with no  
sign  of the other side of zero beat.  
I  can tune CW signals while in either USB or LSB mode and it receives  
perfectly 
with no sign of the other side of zero beat.  So SSB suppression  on both USB 
and LSB  appears to be ok.  
The  only thing that’s not coming up right is while using OP-1 in place of 
FL-1 on  
CW  Reverse.   Everything else  appears to be working as it should be in this 
K2.  
Anyone have  any ideas on what to look for as the cause?    
Frank W7IS