On Dec 30, 16:01, Robert F. Carson wrote: a I'm not Eric (you sent this message to a mailing list), but maybe I can point you in the right direction. The MC3361 is a "radio on a chip" IF subsystem, not terribly old, made by Motorola and second sourced by various companies. The MC3371 is very similar. You can find the Motorola data sheets at http://home.welfen-netz.de/IngoGerlach/9k6_pr/mc3361c.pdf and http://www.iweil.com/devices/recievers/mc3371.pdf The latter is particularly detailed, has a good description, and several sample circuits. -- Pete Peter Turnbull Network Manager University of York