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

Tue Apr 22 06:13:42 EDT 2008

Nope it was the radio cuz I listened on the scanner first before setting it.

After turning it back to 5k,it worked fine.
----- 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 3:38 AM
Subject: Re: [Test-Equipment] FS: Heath IM4180 FM deviation meter

> I think you will find that you had modulation but the
> repeater and other 2 meter receivers could not get enough
> modulation (it was mostly all outside of their narrow
> bandwidth) to recover much of your voice. You were running
> wideband modulation. It would be like listening to broadcast
> FM with your 2 meter receiver. You had way too much
> modulation for the receivers.
>
> WBob, WB6JPI
>
>
> ----- Original Message -----
> From: "Howard" <Esrman at ameritech.net>
> To: "Discussion of Electronic Test Equipment"
> <test-equipment at mailman.qth.net>
> Sent: Tuesday, April 22, 2008 12:28 AM
> Subject: Re: [Test-Equipment] FS: Heath IM4180 FM deviation
> meter
>
>
> > 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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