[ARC5] BC sets and others.

[Geoff]

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 is why geographically close stations are not on 
adjacent frequencies and local listeners are not bothered by more distant 
groundwave stations.

The 3 tier power levels plus antenna directivity are there to protect local 
markets in the daylight, dusk, and night from groundwave, extended 
groundwave, and skywave signals. Class D stations still have their protected 
areas which does not mean for everyone of their listeners who may be outside 
that zone at some hours.
It all goes to prove that AM is not dead yet unless the FCC continues to 
rule via bribes and politics.

IBOC is a mess but stations are gradually abandoning it.

Carl
KM1H



----- 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: Tuesday, January 21, 2014 10:26 PM
Subject: Re: [ARC5] BC sets and others.


> The spacing in the U.S. is 10 kc but every station is allowed up to 10
> kc sidebands.  IBOC has wrecked that, but the 20 kc occupied analog
> bandwidth was allowed via frequency assignments with regard to power,
> pattern, and distance between tx sites.  One of the problems is that
> FCC gradually jammed too many stations in, especially class D, so the
> band is a mess now.
>
> Rob
> K5UJ
>
> On Tue, Jan 21, 2014 at 7:48 PM, Geoff <geoffrey at jeremy.mv.com> wrote:
>> With 10 kc "channels" in place since before 1940 there hasnt been 20 kc 
>> in
>> over 70 years.
>>
>> Carl
>
>
> -----
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