Back in the 'old days' of AM broadcasting in the US, the local stations
were spread out with greater than 10 KHz spacing so they would not
interfere even when received on wide bandwidth AM receivers. There were
a few 'clear channel' superstations that had no competition nationwide
and IIRC,
The FCCs frequency assignment policy protected these Class 1A stations
from both co-channel and adjacent channel interference, if my
recollection of 40 year old rules is correct. Obviously greater
co-channel protection was provided than adjacent channel (+/- 10 KHz)
protection.
As far as
There still are clear channel stations: KFI in Los Angeles, KSL in Salt
Lake City, WLW in Cincinnati, WOR in New York and a number of others across
the country.
Also, with rare exceptions, stations in any given market are at least 20
KHz apart. That is, adjacent channels are not assigned in any
Ron D'Eau Claire wrote:
The clear channel flamethrowers running
500,000 watts are relatively few by comparison.
500kW? I assume that must be a typo. AFAIK, the limit on the AM BCB is 50kW in
Canada and the US.
--
Cheers!
Kevin.
http://www.ve3syb.ca/ |What are we going to do
On Tue, 15 Jan 2008 09:51:38 -0800, Ron D'Eau Claire wrote:
Many AM stations today limit their audio bandwidth to 5 or 6 KHz,
maximum, and even more consumer AM receivers sold today limit the
audio bandwidth to 5 kHz or less!
Some of the reasons for the limits at the transmitter have to do
: [Elecraft] AM bandwidth, the rest of the story :=)
Ron D'Eau Claire wrote:
The clear channel flamethrowers running
500,000 watts are relatively few by comparison.
500kW? I assume that must be a typo. AFAIK, the limit on the AM BCB is 50kW
in
Canada and the US.
--
Cheers!
Kevin.
http
In a message dated 1/15/08 3:18:00 PM Eastern Standard Time, [EMAIL PROTECTED]
writes:
500kW? I assume that must be a typo. AFAIK, the limit on the AM BCB is 50kW
in
Canada and the US.
There was one 500 kW AM BC station in the USA, however. IIRC, it was WLW, and
it ran that power level
]
To: K2 elecraft@mailman.qth.net
Sent: Tuesday, January 15, 2008 1:17 PM
Subject: Re: [Elecraft] AM bandwidth, the rest of the story :=)
Ron D'Eau Claire wrote:
The clear channel flamethrowers running
500,000 watts are relatively few by comparison.
500kW? I assume that must be a typo. AFAIK
David Yarnes wrote:
Well, maybe he did mean 50 KW, but then again there are (were)
stations like good ole' XERF, Del Rio, Texas! That station (and a
bunch of others from south of the border, ran a heck of a lot more
than 50 KW.
I used to listen to XERF, XEG, and several other south of the
OK I looked it up. According to Title 47, part 73.44 of the FCC
regulations, http://www.fcc.gov/mb/audio/bickel/amfmrule.html#AM the
modulation of an AM broadcast station must be down 25 dB at 10.2 kHz
from the carrier. Assuming a 3-pole low-pass filter (e.g. a
pi-network), the filter
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