Should you want to eliminate the subharmonic sampling, you can use an ICS501 with the crystal that came with the kit.? If you look in the files section, June 26 2007 I have an article called
Softrock-Lite with ICS501M.pdf
Also can be found on my webpage
In the article are some photos.? I actually "dead bug" wired the few parts on top of the PCB.? More recently I have used 8 pin SMT adapter boards or custom PCB's.? The parts are inexpensive, really easy to use and directly interface to the softrocks.
Also can be found on my webpage
I recently bought some 501's from Mouser, so they are still available.
Mouser # 972-501MLFT?
1 @ $1,58
Dick K9IVB