Richard,

The narrower FM deviation doesn't make the communications work any better. 
The reason for narrower deviation is so that more channels can be in a given 
amount of bandwidth, in other words, there can be two 2.5KHz stations in the 
space that one 5KHz station would occupy.  I don't believe that the Amateur 
service uses the narrower, less than 5KHz at this time.  The narrower is 
used in commercial applications.

Howard #3

----- Original Message ----- 
From: "Richard B McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, April 26, 2015 10:27 AM
Subject: Re: What is "FM Width"?


> Hi Howard #3!
>
> Thanks!  So, by narrowing the band it makes it more "efficient."  Hhhmmm . 
> .
> . so, does this mean better/longer/clearer RX and TX?  Why or in what
> circumstances would someone use wide versus narrow?
>
> 73,
> Richard KK6MRH
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Howard, W A 9 Y B W
> Sent: Saturday, April 25, 2015 11:01 AM
> To: [log in to unmask]
> Subject: Re: What is "FM Width"?
>
> As I assume you know, FM stands for Frequency Modulation.  The standard 
> for
> many years was a deviation of 5 KHz meaning when you modulate an FM 
> carrier,
> it changes in frequency up to plus and minus 2.5 KHz.  Narrow FM 
> modulation
> is a lesser deviation, 2.5 KHz and 2 KHz.  The reason for a narrow 
> deviation
> is to allow a more efficient use of the radio spectrum.  We are talking
> about two way radio communications above and as a side note, Broadcast FM
> has a deviation of plus or minus 75 KHz. As the deviation widens, the
> fidelity of the transmitted audio increases.  This is why the deviation of
> FM broadcasts have such a wide deviation.
>
> Howard #3
>
> ----- Original Message -----
> From: "Richard B McDonald" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Saturday, April 25, 2015 10:26 AM
> Subject: What is "FM Width"?
>
>
>> Hi!
>>
>>
>>
>> So, I am aware that the "width" of an FM signal can be set to "wide" or
>> "narrow", but what does that mean?  Under what circumstances would you 
>> use
>> one or the other.
>>
>>
>>
>> 73,
>>
>> Richard KK6MRH
>
>
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