Thanks Jack, I wasn't sure what was going on but figured it was something to do with RF in room. There's a repeater a mile or two from me and my computer and TV on so maybe that was driving it nuts.
I just figured when I was asked to do the AC checks, setting the DMM to mV(actually is was on its autoscaling mode) it would show the <20mV as suggested, but instead it was going crazy. I forced the scale to .000 V and I was able to get a .002 to .000 reading on the pins so I figured I was ok. KX1 is pretty nice to build so far, in fact the KXPD was the hardest thing I've done so far. Now I will tackle the receiver circuits. Thanks for the help, -Chris --- Jack Smith <[EMAIL PROTECTED]> wrote: > Chris: > > A DVM has relatively high input impedance and will > pick up stray 60 Hz > and other things floating around (AM broadcast, > perhaps) when the leads > are open. In essence, the leads act like a small > dipole receiving antenna. > > Short the leads together and it should read a lot > closer to zero, unless > you live next door to a substation or a 50 KW AM > broadcast transmitter. > (You can think of this as converting the leads to a > loop antenna, which > has a lot less pickup than a dipole.) > > Thus, the behavior you see is normal. > > Jack K8ZOA > www.cliftonlaboratories.com > > > > Koaps wrote: > > Hello all, > > > > I had a question about using a digital multimeter > for > > AC millivolt measures. > > > > I have a radio shack 24-range DMM and when I set > it to > > mV it never seems to go to zero, its constantly > > counting numbers from 30-100 mV with the leads not > > connected to anything. > > > > If I change the range to .000 V it will show > around > > .020 to .009 with the leads not connected to > anything. > > > > When I tested U1 pin 1 and U3 pin 6 on my KX1 on > the > > .000 V range I got .000, is this an ok measurement > or > > is my DMM too screwy to use for AC mV measures? > > > > All the DC and resistance measurements with it > seemed > > ok. > > > > thanks, > > -Chris > > > > > > > > > ____________________________________________________________________________________Get > the Yahoo! toolbar and be alerted to new email > wherever you're surfing. > > > http://new.toolbar.yahoo.com/toolbar/features/mail/index.php > > _______________________________________________ > > Elecraft mailing list > > Post to: [email protected] > > You must be a subscriber to post to the list. > > Subscriber Info (Addr. Change, sub, unsub etc.): > > http://mailman.qth.net/mailman/listinfo/elecraft > > > > > Help: http://mailman.qth.net/subscribers.htm > > Elecraft web page: http://www.elecraft.com > > > > > ____________________________________________________________________________________ Sucker-punch spam with award-winning protection. Try the free Yahoo! Mail Beta. http://advision.webevents.yahoo.com/mailbeta/features_spam.html _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
