[opendtv] Re: Cable Hookup
- From: "James Albro" <jalbro@xxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 24 Jun 2008 14:00:05 -0400
OTA channel 14 has its visual carrier at 471.25 MHz., the lowest cable
channel at or above this frequency is channel 66, at 475.25 MHz. (IRC
channel plan, HRC is similar). So if the cable system has less than 70
analog channels (2-66 plus 95-99) and the TV set was set for OTA reception
it wouldn't see any analog channels except 2-13, even if the tuner was able
to "fine-tune" the carrier frequency difference.
Also, cable channel "UHF" frequencies are different from OTA. For example,
OTA channel 14 falls between cable channels 65 (469.25 MHz.) and 66 (475.25
MHz.) (IRC). The difference continues through the channel plan.
----- Original Message -----
From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Monday, June 23, 2008 6:04 PM
Subject: [opendtv] Re: Cable Hookup
> This is part of a pattern, since you've never been connected to cable. I
haven't made a connection like this in the last 18 days. I suspect that you
haven't made such a connection in your life, since you've never been
connected to cable. (My family was laggardly; we didn't connect to cable
until October 1966.)
>
> Also, as anybody who has actually tried to tune in cable channels while
connected to cable would tend to know, cable channels are a superset of over
the air channels. (And, I'm wondering where one configures a tv set to tune
in channels 1-13) Cable drops in 'mid-band" and "superband" channels
between ota 13 and 14, but once they run out of those channels, which most
do nowadays, they start using UHF channels.
>
> The ota (14-83) and cable UHF frequencies are the same; it's the channel
numbering that differs. (And, cable can and often does use channels above
ota 69, to the limit of their amps and distro cable.)
>
> The last time I checked, there was zero difference between channels 2-13
vis-a-vis cable and over the air. Maybe, bert, in your extensive experience
with cable connections, you have found a difference, but I doubly doubt it.
>
>
> -----Original Message-----
> >From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
> >Sent: Jun 23, 2008 2:18 PM
> >To: opendtv@xxxxxxxxxxxxx
> >Subject: [opendtv] Re: Cable Hookup
> >
> >Bob Miller wrote:
> >
> >> If someone has cable and is "hooked up", pirating the cable, on
> >> an HDTV set with a tuner will the scan find all the channels,
> >> HD and otherwise? What happens without a digital tuner, if it
> >> only has an analog tuner?
> >
> >The digital "tuner" should be able to find all unencrypted digital
> >channels on the cable. Same goes for the analog tuner.
> >
> >> Someone is claiming that on an HDTV set with tuner they are
> >> getting 2-13 analog and digital channels 2.1 2.2 to 13 but
> >> nothing else, no CNN or HBO. They claim to be getting only
> >> analog 2-13 on the HDTV with no tuner.
> >
> >The fact that they only receiving Ch 1-13 leads me to believe that
> >possibly they have not configured the TV set to tune to the cable
> >frequencies. All of my STBs, VCRs, PVRs, and integrated TV sets, have
> >this as one of the first steps in the setup menu.
> >
> >In fact, aside from Ch 5 and 6, which are slightly different, channels
> >2-13 use the same frequencies for cable and OTA. So if the set thinks
> >it's hooked up to an OTA antenna, it will be able to receive any analog
> >or digital stations in channels 2-13 (minus 5 and 6), even if connected
> >to a cable system.
> >
> >However, cable systems also use VHF frequencies between Ch 6 and 7 (i.e.
> >the big gap between 83.25 and 175,25 MHz), below Ch 2 (below 55.25 MHz),
> >and also above Channel 13, on which they may very well have stations
> >that are UHF stations OTA.
> >
> >Over tha air, the gap between Ch 13 and Ch 14 is between 211.25 and
> >471.25 MHz. Instead over cable, Channel 14 picks up at 121.25 MHz, which
> >is still VHF. Turns out that cable channels 14 through 36 all use
> >frequencies in the VHF band. By definition, at or below 300 MHz.
> >
> >Tell him to make sure he has the set configured for cable freqs.
> >
> >Bert
> >
> >
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