[Test-Equipment] FS: Heath IM4180 FM deviation meter

[Mike Manes]

How arcane.  Yes, the math works, but try looking at it with just an
RF power instrument: FM envelope amplitude is constant, and that's why
one can use a non-linear PA, like Class C.
73 de Mike W5VSI

James Duffer wrote:
> While the provided answer to your question will suffice, actually Frequency Modulation (FM), the carrier does not change in frequency, the amplitude varies, this can be observed with a spectrum analyzer and proven mathmematically.  The modulated wave has various side frequencies that vary in both frequency and amplitude depending on the modulating source.  AM (Amplitude Modulation) the carrier is constant but the modulated composite varies in amplitude as a result of the combination of the carrier and side frequencies.
>  
> Keep asking questions about things that interest you, and follow up with reference material.
>  
> 73, Jim, wd4air> From: kc7hkp at comcast.net> To: dickburk at ix.netcom.com; test-equipment at mailman.qth.net> Subject: Re: [Test-Equipment] FS: Heath IM4180 FM deviation meter> Date: Tue, 22 Apr 2008 00:40:01 +0000> CC: > > Thanks You very Much Richard for answering Me !, I did not know what it was, I can only learn from books since elmer are not around much any more.> being handicapped in a wheelchair and stuck in my bedroom, I only have books or the net to learn> So Thanks again for taking the time to answer.> Instead of degrading me because i did not know.> George> --> KC7HKP > George Yazzolino > 14801 NE 20th Circle > Vancouver, Wa. USA ,98684 > Grid CN-85 > kc7hkp at arrl.net> > -------------- Original message -------------- > From: "Richard Knoppow" <dickburk at ix.netcom.com> > > > > > ----- Original Message ----- > > From: > > To: "Discussion of Electronic Test Equipment" > > > > Sent: Monday, April 21, 2008 1:25 PM > > Subject: Re: [Test-Equipment] FS: Heath IM4180 FM deviatio
n > > meter > > > > > > > Hi Dick > > > What is FM Deviation ? > > > I have not heard this word before in ham radio . > > > Sorry to bother you > > > George > > > > > In case this is a serious question... > > Deviation is the measure of the amount of frequency > > modulation in an FM signal. It is superficially the amount > > the carrier is changed in frequency when modulated. There > > are several ways to measure the amount of FM but its > > possible to make a fairly simple device to indicate it on a > > meter although other methods are more accurate. > > FM transmission became popular for the ham bands after > > WW-2. It has pretty much disappeared on the HF bands but is > > quite widely used on 6 meters and above. > > The other reaction to the question is because FM should > > be elementary knowledge. OTOH, no one should be afraid to > > ask a question for fear of being humiliated. > > May I suggest that a Google search is a good place to > > start for definitions. > > > >
 --- > > Richard Knoppow > > Los Angeles, CA, USA > > dickburk at ix.netcom.com > > > > ______________________________________________________________ > > Test-Equipment mailing list > > Home: http://mailman.qth.net/mailman/listinfo/test-equipment > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:Test-Equipment at mailman.qth.net > ______________________________________________________________> Test-Equipment mailing list> Home: http://mailman.qth.net/mailman/listinfo/test-equipment> Help: http://mailman.qth.net/mmfaq.html> Post: mailto:Test-Equipment at mailman.qth.net______________________________________________________________
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-- 
Mike Manes    mrmanes at gmail.com     Tel: 303-979-4899
"Things should be made as simple as possible, but not more so."
A. Einstein