[Elecraft] xmit and receive frequencies different

[Merlarts at aol.com]

Hi gang,
 
My K2 (2631) with KSB2 doesn't transmit and receive on the same  frequency.  
There's about a 70Hz difference on lower sideband and 50Hz on  upper.  The 
transmit frequency is always lower than the receive  frequency.  
 
Carrier supression is great, transmit audio sounds good, and I'm within no  
more than 100Hz away from the suggested frequencies.  The package came with  
3.6Khz markings.  
 
I've run Cal PLL a number of times.  The VFO is accurate and  linear.  It 
just won't transmit and receive on the same frequency.  
 
Any thoughts?
 
Merlin, W3ICT
 
merlarts at aol.com