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

Tue Apr 22 03:28:39 EDT 2008

All I know is what I have expierienced.

When I first became a ham....

I bought an old kenwood 2600 and on 2-meters I could hit the repeater but
was told I had a good carrier but no modulation.

Someone who knew me called and told me to check the deviation.

I did and it was way more than 5 k that it was supposed to be.

So he told me what pot to turn  and how to check it.

I set it right and after that I had pretty good modulation.

So to make sure that I hadn`t changed something else after opening it,I set
the pot back.

No modulation,terrific carrier.

So I set the pot again.

Now the radio sounds loud and clear.

I set the pot with a scanner on the freq of interest for the loudest
modulation,actually the best-sounding modulation.

so I have learned that deviation is critical to any sound out at all!

You can also turn it so low that modulation is almost non-existent.
----- Original Message -----
From: "wolfbob" <wolfbob at csnsys.com>
To: "Discussion of Electronic Test Equipment"
<test-equipment at mailman.qth.net>
Sent: Tuesday, April 22, 2008 2:44 AM
Subject: Re: [Test-Equipment] FS: Heath IM4180 FM deviation meter

> Howard..
>
> What do you mean?
>
> WB
> ----- Original Message -----
> From: "Howard" <Esrman at ameritech.net>
> To: "Discussion of Electronic Test Equipment"
> <test-equipment at mailman.qth.net>
> Sent: Monday, April 21, 2008 11:39 PM
> Subject: Re: [Test-Equipment] FS: Heath IM4180 FM deviation
> meter
>
>
> > 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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