Hi Lymex, A DBM is a standard RF component, so I don't think it's something you would build.
HP made them years ago (HP 10514A) and companies like Mini-Circuits still do; in great variety and quantity. See, for example: http://www.minicircuits.com/dg03-102.pdf http://www.minicircuits.com/mixer.shtml This will tell you how they work: http://www.minicircuits.com/appnote/mxr1-25.pdf I assume you have a good local source for new or used electronic components. A DBM, old or new, should not cost very much. For a photo of the old HP 10514A DBM see: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7534160664 /tvb ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, July 28, 2005 08:01 Subject: RE: Re: Allan Deviation of Z3801A > Dear Tom, > > Thank you so much for you great reply, which clears up most of > my confusions. > > Also thanks for contacting John for my register problem, I am > now registered manually by him. > > I have experience on electronics and understand the beat method > which sound to be a very nice idea. However, I don't have > experience on how to build a DBM. It seems to me that this is > the only feasible way to measure Allan Dev, so any help on this > is greatly appreciated. > > Thanks again, have fun! > > Lymex, BG2VO _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts