[ARC5] BC sets and others.

[Geoff]

I believe that is still inaccurate, but I invite you to do the legwork; Im 
kind of busy these days getting customer repairs out the door.

It is my understanding that the 10.2 kHz is the total audio bandwidth and 
not each sideband.

In any case many antenna systems do not have much beyond a 10KHz BW, Ive 
been at several stations and can listen to what comes out of the TX and also 
what actually gets broadcast. The chopped sidebands are very apparent.

Carl



----- Original Message ----- 
From: "Rob Atkinson" <ranchorobbo at gmail.com>
To: "Geoff" <geoffrey at jeremy.mv.com>
Cc: "Robert Eleazer" <releazer at earthlink.net>; "ARC-5 List" 
<arc5 at mailman.qth.net>
Sent: Wednesday, January 22, 2014 12:56 PM
Subject: Re: [ARC5] BC sets and others.


> On Wed, Jan 22, 2014 at 10:19 AM, Geoff <geoffrey at jeremy.mv.com> wrote:
>> That is not completely accurate. Analog stations are allowed 10 kc total
>> bandwidth at full power with a rapid drop after that and nothing beyond 
>> 10
>> kc per sideband.
>
> That may have been true at one time; not sure about that, however FCC
> adopted the NRSC "mask" which defines stepped attenuation of the
> sidebands starting out at 10.2 kc from carrier and continuing out.
> Nothing closer in.  Most stations operate with NRSC (National Radio
> Systems Committee) compliant processors that employ treble boost
> (pre-emphasis) to compensate for the lousy modern AM receiver high
> frequency roll-off.  They have a low pass filter cutoff usually around
> 9.5 kc.  This all began around 1990.
>
> Rob
> K5UJ
>
>
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