All my homebrew stuff uses radio shack meters and home made shunts. To calibrate them, I use a variac and a dmm and get the meters to read the same up to 1000 volts (what the DMM does).
I been looking at the extra class test, I can homebrew a station and an antenna, but cant pass that test, lots of stuff about modes I never heard of, digital stuff, satellite stuff, vhf stuff, etc. YUK! Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Geoff/W5OMR > Sent: Monday, July 23, 2007 11:31 AM > To: Discussion of AM Radio in the Amateur Service > Subject: Re: [AMRadio] Average OP Age was BA Tr FS > > [EMAIL PROTECTED] wrote: > > > No shortage of meters here but who even can calculate the > shunt or series resistor for an analog meter nowdays. > > From some of the questions I see posted by newbys on > several Ham forums I have to wonder how they ever passed the test. > > > > > Depends on the meter movement. A FS=1mA meter movement is > 1000 ohms per > volt. So, in order to measure kV, the series shunt is > 1Megohm per 1000v. > Therefore, if your DC volt meter reads 0 ~ 5, then 5Megohms would > measure 5,000VDC at full scale. > > I think, though, you're asking more along the lines of "who, of the > 'todays ham' crowd even posses the knowledge of how to build a meter > shunt" and I've got to agree. > > Have you -seen- a test, recently? I got licensed in Feb of > 1984, by two > general class license holders. That was before the VE program. In > September of that following year, was the last time the FCC > came to San > Antonio to administer tests. The VE program was -very- close > behind (3 > months or so, as I recall). > > 10 years after that, I helped out in the VE program, and Oh My > Goodness!! The CW test is 'MULTIPLE GUESS'? (back when they -had- CW > testing ~sigh~) > > The theory questions weren't much better... > > "What is the current through a 1k ohm resister if 1v is > applied across it? > A) 250 Amps > B) 117VAC > C) 47 ohms > D) 100mA > > No, seriously.. it was -that- bad! And that was 13 years > ago. Can you > imagine how much further down the bar has been 'lowered' by the > lobbyist/employers of the Yae-com-wood manufacturers of today? > > Wait... you (collectively) looked surprised.... > > Oh, c'mon... you don't -really- think the ARRL lowered the > standards of > entry level Ham Radio licensing out of the goodness of their > hearts, do you? > > "Money Talks" > (you know the rest) > > -- > 73 = Best Regards, > -Geoff/W5OMR > > ______________________________________________________________ > AMRadio mailing list > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > To unsubscribe, send an email to [EMAIL PROTECTED] with > the word unsubscribe in the message body. > ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
