Eldon, I still have not really finished this either. I understand how to set the BFO frequencies at the edge of the crystal filter but I think that will have an impact on the actual frequency that I am transmitting or receiving on. Even 2 or 3 kHZ seems like a decent error... I think the correct thing to do would be to adjust the LSB/USB frequency offset in the code once you know what are your BFO frequencies. Food for thought - Hope I am not adding confusion ;) I just saw your site. Love your construction style. Really elegant and fun. How do you assemble all the modules together? 73, thomas On Fri, Mar 14, 2014 at 10:22 AM, Eldon Brown <eldonb46@xxxxxxxxx> wrote: > Thanks Wayne, > > Those are the conclusions that I was approaching, and thanks for the link. > > Regards, > Eldon Brown > > 73 - Eldon - WA0UWH - CN88xc - http://WA0UWH.blogspot.com/ > > > >