Here is a website that discusses a toroid RF phase shift which works
fairly well.

http://www.seboldt.net/k0jd/phase_notes.html

==============================================


Oh yes, in answer to your other post regarding DDS, look at

http://home.comcast.net/~aa0zz/index.html

This website has a DDS VFO which also provides the 90 degree split. It
uses the AD9854 and it is reasonably clean, but it does have low level DDS
spurs. It is not exactly low cost, but you do get a reasonably complete
design, including the rotary shaft tuning dial interface for controlling the
DDS.


Jim Pennell
N6BIU


--

21:40 Pacific Time Zone
Jun 1 2007

International Time
04:40 UTC
02.06.2007