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Re: Cable Modems on HAM bands?



Jon,

The point here is that operators looking for interference from cable modems
should not look in the 42-65 MHz band in the US. There are no cable
operators that I know of that use this segment of the band. People can check
if they can see a signal in channels 2,3,4,5 to verify that a 65 MHz band is
not used in their location. In a 65 MHz reverse system, the forward channels
start around 86 MHz which would not allow transmission of the lower TV
channels.

Pieter

----- Original Message -----
From: "Jon Ogden" <na9d-2@speakeasy.net>
To: "IP" <sietetrescincoprimo@hotmail.com>; "Bob Bruninga"
<bruninga@usna.edu>; <amsat-bb@AMSAT.Org>
Sent: Tuesday, May 20, 2003 11:52 AM
Subject: Re: [amsat-bb] Cable Modems on HAM bands?


> The term "New" is in relation to the Docsis standards.  The most recent
> standard defines the frequencies I gave.  In North America, there is no
> "frequency" allocation in CATV.  The operators can use whatever standards
> they want.  While it's true that most of the modems probably use the 5 to
42
> MHz band because of backward compatibility, the actual Docsis standard has
> the 5 to 65 MHz range.  The operator can use whatever frequencies in that
> range he wants.
>
> 73,
>
> Jon
> NA9D
>
> on 5/20/03 10:09 AM, IP wrote:
>
> > 99 percent of the modems are in the 5-42 MHz band in the US. The 5-65
MHz is
> > not a newer/old issue it is a north america / europe issue. The cable
splits
> > are:
> >
> > 40/52 or 42/54 for north america
> > 65/86 for europe
> > 55/70 for japan
> >
> > These can change +/- a couple of MHz.
> >
> > Pieter
>
> -------------------------------------
> Jon Ogden
> NA9D (ex: KE9NA)
>
> Citizen of the People's Democratic Republik of Illinois
>
> Life Member: ARRL, NRA
> Member:  AMSAT, DXCC
>
> http://www.qsl.net/na9d   <- Updated on 1/22/03!!!
>
> "A life lived in fear is a life half lived."
>
>
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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>
----
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