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

Tue Apr 22 03:38:37 EDT 2008

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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