Here are acouple of links that has quite a bit of information on the Pullen Mixer. Many of you have probably already seen these. http://www.mines.uidaho.edu/~glowbugs/receivers.htm http://www.mines.uidaho.edu/~glowbugs/Pullen%20Mixer%20from%20RSGB.pdf http://web.itctel.com/~rhaub/glowbug/regenodyne/regenodyne.htm Best, DW Holtman WB7SSN