Date: Mon Feb 12 22:09:34 2007

Author: Chuck Patten

Subject: Re: double connection to DVR?

Post:
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The most likely reason is that the cable box gets its validation via the RF
connection to enable it to decode the premium services that you have. That
special data is not present in the video sent to the TV via the RCA style
cables which also give you a much better quality signal than you would get
via the RF if it was re-modulated by the cable box and sent to the TV.

cheers,
chuck...

_____

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Bernard Cleyet
Sent: Monday, February 12, 2007 2:13 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] double connection to DVR?


The recorder may get time a signal from the direct connection and likely not
from the video. Not a very good box if it gives you only ordinary video
instead of separated (three video cables -- chrominance, luminance) or
S-video. And what connects to the monitor or TV?

If you were to connect the box to the TV how would you do it and why can't
you put it between the TV and the box -- weird.

bc

p.s. when I want to record just sound from streaming or radio, I can't. I
must feed any old video (either S or ordinary vid). First I used ordinary
from a portable colour bar / dot, etc. generator and then S from one of my
VHS recorders.

Paul Nord wrote:


Makes no sense to me. The DVD player should just be a pass-through for the
RF signal. An encoded signal shouldn't be of any use. If the complete
signal isn't on the RCA cables, how would a TV deal with it?

What happens when you connect the RF cable directly to the TV decoder?

I generally connect the TV/VCR cards with both the RCA inputs and the RF.
People seem to insist that the TV must be on channel 3. If that's not
connected, they get hopelessly confused. But the RCA inputs work much
better. I switch the channel back to "AV Input" whenever I can.

Paul


On Feb 11, 2007, at 11:13 AM, Carter, Tom wrote:


Folks,

This is really only barely a physics hardware question, but I figured
someone on this list would know so I thought I'd ask. Does anyone know why
you have to have both an RF cable connection and a RCA cable connection
between a recording device and your TV cable box?

I just spent a frustrating day hooking up and learning to use my new
fancy-shmancy DVD recorder. (It appears they don't make VHS recorders any
more and the one I've had since grad school just died.) During one of my
many phone calls with tech-support, the person was extremely clear that I
needed to have the connections from my TV cable in this order:
a) RF coax cable directly from outside the house INTO back
for DVD recorder
b) RF coax cable OUT of back of the recorder INTO the cable
TV decoding box
c) Three RCA cables (yellow, white, red) OUT of the TV
decoding box back into DVD recorder

So it seems like the DVD recorder needed to get connected twice to the
TV signal, once before the decoder (RF) and once after (RCA).

The tech support person admitted there were many mistakes in their
instruction manual, but she was insistant that this portion was correct.
When I asked her why, she said "It needs to get the signal, Mr. Carter.
There is no other way." That made it clear!

Any ideas? Just tech-support non-sense? Maybe some kind of clocking
signal that the decoder strips away that the DVR needs? I'm happy to take
this conversation offline if the explanation get too long (or too boring to
everyone else).

Tom


--------------------------
Dr. Tom Carter
Physics
College of DuPage
(o)630-942-3346
http://www.cod.edu/people/faculty/cartert



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The most likely reason is that the cable box =
gets its=20
validation via the RF connection to enable it to decode the premium =
services=20
that you have. That special data is not present in the video =
sent to=20
the TV via the RCA style cables which also give you a much =
better=20
quality signal than you would get via the RF if it was re-modulated by =
the cable=20
box and sent to the TV.

cheers,
chuck...


From: tap-l-owner@lists.ncsu.edu=20
[mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Bernard=20
CleyetSent: Monday, February 12, 2007 2:13 PMTo:=20
tap-l@lists.ncsu.eduSubject: Re: [tap-l] double connection to =

DVR?
The recorder may get time a signal from the direct connection =
and=20
likely not from the video. Not a very good box if it gives you =
only=20
ordinary video instead of separated (three video cables -- chrominance,=20
luminance) or S-video. And what connects to the monitor or =
TV?If=20
you were to connect the box to the TV how would you do it and why can't =
you put=20
it between the TV and the box -- weird.bcp.s. when =
I want=20
to record just sound from streaming or radio, I can't. I must feed =
any old=20
video (either S or ordinary vid). First I used ordinary from a =
portable=20
colour bar / dot, etc. generator and then S from one of my VHS=20
recorders.Paul Nord wrote:
Makes no sense to me. The DVD player should just =
be a=20
pass-through for the RF signal. An encoded signal shouldn't be =
of any=20
use. If the complete signal isn't on the RCA cables, how would a =
TV deal=20
with it?=20

What happens when you connect the RF cable directly to the TV=20
decoder?

I generally connect the TV/VCR cards with both the RCA inputs and =
the=20
RF. People seem to insist that the TV must be on channel =
3. If=20
that's not connected, they get hopelessly confused. But the RCA =
inputs=20
work much better. I switch the channel back to "AV Input" =
whenever I=20
can.

Paul



On Feb 11, 2007, at 11:13 AM, Carter, Tom wrote:


Folks,

This is really only =
barely a=20
physics hardware question, but I figured someone on this list =
would=20
know so I thought I'd ask. Does anyone know why you =
have to=20
have both an RF cable connection and a RCA cable =
connection=20
between a recording device and your TV cable box?

I just spent a =
frustrating day=20
hooking up and learning to use my new fancy-shmancy DVD =
recorder. (It=20
appears they don't make VHS recorders any more and the one I've had =
since=20
grad school just died.) During one of my many phone =
calls with=20
tech-support, the person was extremely clear that I needed to have =
the=20
connections from my TV cable in this order:
&nb=
sp; =20
a) RF coax cable directly from outside the house INTO back for =
DVD=20
recorder
&nb=
sp; b)=20
RF coax cable OUT of back of the recorder INTO the cable TV =
decoding=20
box
&nb=
sp; =20
c) Three RCA cables (yellow, white, red) OUT of the TV decoding box =
back=20
into DVD recorder

So it seems like the DVD =
recorder=20
needed to get connected twice to the TV signal, once before =
the=20
decoder (RF) and once after (RCA).

The tech support person admitted =
there were=20
many mistakes in their instruction manual, but she was insistant =
that this=20
portion was correct. When I asked her why, she said "It needs =
to get=20
the signal, Mr. Carter. There is no other way." That =
made it=20
clear!

Any ideas? Just =
tech-support=20
non-sense? Maybe some kind of clocking signal that the =
decoder=20
strips away that the DVR needs? I'm happy to take this =
conversation=20
offline if the explanation get too long (or too boring to everyone=20
else).

&nb=
sp; &nbs=
p; =
; =
&=
nbsp; =20
Tom



--------------------------
Dr. Tom Carter
Physics
College of DuPage
(o)630-942-3346
http://www.cod.edu/peo=
ple/faculty/cartert

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