[TechAssist] Re: RCA PTK178, Close captioning question.

What is VITS?  18 years ago TSN (The Sports Network) was always washed
out looking on the first 40" Mitsubishi projection TV's.  I think my
boss phoned the cable company and they said they could do nothing about
it because it was the fault of the channel.  8 years later I bought a
used Panasonic GAOO 27" and it had the same problem with TSN.  I phoned
the cable company and it was fixed the very next day.  The cable must
have been doing similar things with the video signal.  

Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx 
 

-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Hoyt's TV
Sent: Friday, December 31, 2004 5:43 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA PTK178, Close captioning question.

Since no one else has jumped in, I'll give you my 2 cents worth.

I haven't studied that situation, but it sounds likely to me. I believe
(really taxing the memory here) that CC is in the vertical interval and
whenever the composite signal is disassembled and reassembled, as some
cable
companies have done in the past, it's easy to lose some of those things.
Any
time you use a set top box, you have the chance that this was done to
the
signal at some point, because somebody has had the opportunity to mess
with
that signal after it left the transmitter and before it got to you. Not
all
of them are broadcast engineers.

Around here we had a problem 25 years ago of severe brightness
differences
between channels on Zenith TVs of the vertical chassis design, but only
on
cable. Seems that Zenith was using the base line in the video signal as
an
automatic brightness reference. Our cable company was disassembling and
reassembling each channel before putting it on their system and not
paying
much attention to that part of the signal. It only bothered Zeniths, so
apparently they were the only company using that as a brightness
reference.

The cable company denied it of course, but Zenith's engineers explained
it
to me in great detail. Since they were the ones who originally designed
the
cable system we use, way back in the late 40s and early 50s. Since the
guy I
talked to was there at the time, I kind of believed him over the cable
company.

What ever happened to VITS? I saw a few GE TVs that used it, way back
when.
Never saw any others.


Russ Hoyt
Hoyt's TV
Exeter, NH


----- Original Message ----- 
From: "Kevin" <kevintv@xxxxxxx>
To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, December 30, 2004 4:14 PM
Subject: [TechAssist] RCA PTK178, Close captioning question.


> Sorry I do not have the model #, but this is just a general question
> about CC, so I hope that will be OK.  Does CC work through all inputs
> (cable, composite, S-Video, and component)?  Or does CC only work
> through channel 3?  I repaired an RCA PTK178 and hooked up their
> satellite through the S-Video input, and disconnected the cable from
the
> satellite receiver.  Now they say the CC is turned on but does not
work
> at all.  I suggested they watch the satellite through channel 3 as
they
> did before the repair and see if that corrects the problem.  By the
way
> the original problem was coolant on the P/S board that was causing a
> jitter in the picture.  I repaired it by cleaning the board, replacing
a
> cap, and resealing all 3 tubes.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
>
>
>
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