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

[Howard]

And if your deviation is set too high ,at least in the 2-meter band,you`ll
actually not put out any modulation.
----- Original Message -----
From: "James Duffer" <dufferjames at hotmail.com>
To: "Discussion of Electronic Test Equipment"
<test-equipment at mailman.qth.net>; "Richard Knoppow" <dickburk at ix.netcom.com>
Sent: Monday, April 21, 2008 9:15 PM
Subject: RE: [Test-Equipment] FS: Heath IM4180 FM deviation meter



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 deviation > > 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 > > > >
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