|[AMRadio] Average OP Age was BA Tr FS|
brett.gazdzinski at verizonbusiness.com
Mon Jul 23 14:41:21 EDT 2007
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.
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] 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
> DOXEMF at aol.com 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,
> AMRadio mailing list
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