I suppose that I could get myself a "known good " unit (we do have some), and play around with a short loop and my attenuator until I got the known good unit to pick up the signal, and then set that as a standard. Not very scientific, though... --Lawrence ----- Original Message ----- From: "Dale Botkin" To: Sent: Friday, May 24, 2002 1:00 PM Subject: Re: [EE]: Sensitivity training for Engineers > Why not just couple it with a short loop? You're after a small signal > anyway. > > And bear in mind -- if your on board clock is anywhere near accurate, you > can go several days without a WWVB sync-up and not be significantly off > the real time. I have a WWVB clock in the basement; some nights it syncs, > some nights it doesnt', but I figure if it gets synced once a week it's > close enough I'd never notice the few seconds' drift. > > Dale > -- > "Curiosity is the very basis of education and if you tell me that > curiosity killed the cat, I say only the cat died nobly." > - Arnold Edinborough > > > On Fri, 24 May 2002, Lawrence Lile wrote: > > > I am probably stuck with fabricating such a signal generator, for two > > reasons: > > > > 1. We will want to superimpose WWV compatible time code signatures on it to > > fully test our product > > > > 2. The FCC would go ballistic if I transmit on 60KHz, so the whole thing > > will have to be in a big steel faraday cage with EMC gaskets on the doors, > > and so on. > > > > Maybe this is as simple as: > > > > 1. Produce 60KHZ 5V signal > > 2. Superimpose a WWV compatible time code on it > > 3. put the whole thing into a very well shielded enclosure > > 4. Attenuate it with a variable resistor array by 1E-6 or so inside another > > good enclosure > > 5. inject said signal into another well shielded enclosure using an antennae > > that has a ghost of a chance of transmitting it > > > > > > Now, a half-wave antenna at 60KHZ is only 7800 feet long, which will be a > > little impractical to do in the lab. Hmmmm... Doesn't look so simple. > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.