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Subject:
Re: What is "FM Width"?
From:
howard kaufman <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Sun, 26 Apr 2015 12:14:13 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (71 lines) 
Copyability.
Just because you can hear it farther, doesn't mean that you can understand
the words.
Probably easier to build equipment as well.
Technological invention continues to make more efficient types of operation
as time goes on, but all of the older equipment is still out there being
used.


-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Richard B McDonald
Sent: Sunday, April 26, 2015 10:27 AM
To: [log in to unmask]
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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