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

[wolfbob]

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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