Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!pasteur!agate!ig!uwmcsd1!bbn!gatech!mcnc!unccvax!dya
From: dya@unccvax.UUCP (York David Anthony)
Newsgroups: sci.electronics
Subject: Re: Where did Channel 1 go?
Message-ID: <1004@unccvax.UUCP>
Date: 10 Jun 88 19:14:18 GMT
References: <996@unccvax.UUCP> <4990002@hpccc.HP.COM>
Organization: Univ. of NC at Charlotte, Charlotte, NC
Lines: 34

In article <4990002@hpccc.HP.COM>, lkraft@hpccc.HP.COM (Lyle Kraft) writes:
>     I don't know what the current FCC broadcast rules state, 
>     but it used to be that video carriers were required to be
>     within + or - 2kHz of their assigned carrier frequencies.
>     Therefore, it would be very difficult to get 10 or 20kHz 
>     beats between interfering stations. 

      The carrier frequencies assigned to full power TV stations
are specified with an offset in the Table of Assignments (Title
47CFR 73.607[b] ?).  This is a table which lists the communities
and the channels which may be applied for (and on which there are
usually operating TV stations).  A channel may not be used in the
community until first a Petition for Rulemaking is prosecuted 
alloting that channel to the community.

      For example, the entry for Greensboro, North Carolina reads
(I think)

     Greensboro: 2-,48+,61

     High Point: 8,*32+,67+

     Channel 2 has a "minus" offset, thus its carrier frequencies
are 55.240000 mHz and 59.740000 mHz (the nominal being 55.25 and
59.75); channel 48 has "plus" offset, and channel 61 has "
zero" offset, or the "real" carrier frequencies.

    You must maintain precision offset operation within 1 kHz
of the designated offset carrier frequenices.

York David Anthony
DataSpan, Inc

The *channel designation refers to a channel reserved for
noncommercial/educational use