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

Sheldon Daitch sdaitch at mor.ibb.gov
Tue Apr 22 08:44:11 EDT 2008 

I suspect the scanner is also a narrowband receiver as well.

73
Sheldon
WA4MZZ

Howard wrote:

>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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>>>>>          
>>>>>
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>>>>>          
>>>>>
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>>>      
>>>
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>>    
>>
>
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