Hi: Ran across this recently, for those looking for odd stable frequencies. http://www.qrp-labs.com/ocxokit I haven't built one of these, but for $16 plus shipping, hey. It does use a single-loop oven, built in. I've had conversation with QRP labs, and found them knowledgeable and congenial. Toyed with ordering one for testing, but haven't done so yet. The pile is already high. Certainly can get frequencies out with low-end OCXO stability at a very reasonable price if indeed it works. Don -- Dr. Don Latham PO Box 404, Frenchtown, MT, 59834 VOX: 406-626-4304