[Test-Equipment] Information needed RF meter

[Gary Schafer]

Short the antenna terminals on the receiver.

73
Gary  K4FMX

> -----Original Message-----
> From: test-equipment-bounces at mailman.qth.net [mailto:test-equipment-
> bounces at mailman.qth.net] On Behalf Of J ALLEN CALL
> Sent: Tuesday, October 20, 2009 7:13 PM
> To: test-equipment at mailman.qth.net
> Subject: Re: [Test-Equipment] Information needed RF meter
> 
> 
> Hi Robert:  OKay.  Here is what I am doing.  I have an AM transmitter
> rated at 100milliwatts on 1620Khz.  It is connected to a 8 foot vertical
> antenna, with a loading coil and variable capacitor, and I would like to
> connect the meter so that I can adjust the loading coil turns and
> capacitor for maximum output.  I know that I can use a scope but I need
> this to be portable.  What I am trying to do is demonstrate a recording
> that I have with President FDR giving his December 8, 1941 talk to the
> nation about the Japanese bombing of Pearl Harbor and declaring war on
> Japan.  I have a Hallicrafters SX28A  tuned to 1620Khz so that the
> broadcast can be heard using the 1941 era receiver.  The transmitter is so
> close to the receiver that it pegs the S-meter which is why I need the
> milliwatt RF meter.  Any suggestions?
> 
> 
> 
> J
> 
> W7KSG
> .
> 
> 
> 
> 
> 
> > From: WA5CAB at cs.com
> > Date: Tue, 20 Oct 2009 19:52:02 -0400
> > To: test-equipment at mailman.qth.net
> > Subject: Re: [Test-Equipment] Information needed RF meter
> >
> > Jay,
> >
> > The answer is that more information is needed. If the RF source is
> > something like an exciter, rated for example to output 100 mW into a 50
> ohm load,
> > and you want to connect an indicator to see whether it works properly or
> not,
> > then how to do that depends upon whether it is connected to its intended
> > load or not. If not, you need a dummy load watt meter (or milliwatt
> meter).
> > If the intended load is connected, you need an RF voltmeter. The two can
> be
> > substantially the same circuit wise, but component values will differ by
> at
> > least one and better two or three orders of magnitude.
> >
> > In a message dated 10/20/2009 6:29:47 PM Central Daylight Time,
> w7ksg at q.com
> > writes:
> > > I need a meter to measure 100milliwatts of RF. I was wondering if I
> > > connect the RF source to a 0-200Ua DC meter and put a diode in series
> with the
> > > plus of the meter to change it to DC would that work? Would it be
> sensitive
> > > enough to get a reasonable response on the meter scale? I know that it
> > > will not be calibrated. I just need an output indication. Any ideas
> out
> > > there? Thanks.
> >
> > Robert Downs - Houston
> > wa5cab dot com (Web Store)
> > MVPA 9480
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