lkraft@hpccc.HP.COM (Lyle Kraft) (06/10/88)
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.
What gives ?
Lyle dya@unccvax.UUCP (York David Anthony) (06/11/88)
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