Well I looked at my Google Bookmarks and found this:=A0 http://scottyspectr=
umanalyzer.com/

While not a spectrum analyzer, a component of a VNA is a comb generator, fo=
und here:
http://www.thegleam.com/ke5fx/cg.htm

Instead of searching for spectrum analyzers, you may find more help looking=
 for VNA's.=A0 There are several of those projects on the 'net, although th=
ey don't make it to 1GHz.
http://sdr-kits.net/DG8SAQ/VNWA/baier_VNWA10_QEX.pdf
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.