Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Television Broadcast Theory

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 12-27-2011, 09:56 AM
Kamakiri's Avatar
Kamakiri Kamakiri is offline
Administrator
 
Join Date: Jun 2002
Location: Buffalo, New York
Posts: 5,048
Test pattern?

I have to do a proper linearity adjustment on my '63 Zenith portable, and was wondering how everyone here does theirs? A television analyst, a DVD with a test pattern, SWAG it, or.....?
__________________
"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
Reply With Quote
  #2  
Old 12-27-2011, 10:05 AM
maxhifi's Avatar
maxhifi maxhifi is offline
VideoKarma Member
 
Join Date: Dec 2010
Posts: 1,457
I bought a home theatre setup DVD, which has color bars, cross hatch, dots, etc.

Feed it into a VCR, and then VCR into TV

I don't trust my ancient unrestored TV analyst to have any better linearity than the ancient TV I'm trying to align.
Reply With Quote
  #3  
Old 12-27-2011, 10:08 AM
bob91343 bob91343 is offline
VideoKarma Member
 
Join Date: Nov 2010
Posts: 745
I have a color bar generator for sale.
Reply With Quote
  #4  
Old 12-27-2011, 11:29 AM
earlyfilm's Avatar
earlyfilm earlyfilm is offline
Eternal Member
 
Join Date: Jun 2011
Location: Culpeper, VA
Posts: 527
Quote:
Originally Posted by Kamakiri View Post
I have to do a proper linearity adjustment . . . .
You can get a custom DVD created here and the money goes to a good cause:

http://www.earlytelevision.org/for_sale.html

Jas.
Reply With Quote
  #5  
Old 12-27-2011, 11:59 AM
Kamakiri's Avatar
Kamakiri Kamakiri is offline
Administrator
 
Join Date: Jun 2002
Location: Buffalo, New York
Posts: 5,048
Good call, I just ordered one!
__________________
"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
Reply With Quote
Audiokarma
  #6  
Old 12-27-2011, 12:42 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,610
I tend to use my 1970's SS Heathkit generators.
__________________
Tom C.

What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

Reading between the scan lines since the mid 2000's.
Reply With Quote
  #7  
Old 12-27-2011, 04:20 PM
Celt's Avatar
Celt Celt is offline
Peanut Head
 
Join Date: Nov 2002
Location: Paragould, Arkansas
Posts: 1,653
I always liked this one which I refer to as "Old boring B&W movie about Indians".

__________________

Let me live in the house beside the road and be a friend to man.
Reply With Quote
  #8  
Old 12-28-2011, 07:09 AM
Kamakiri's Avatar
Kamakiri Kamakiri is offline
Administrator
 
Join Date: Jun 2002
Location: Buffalo, New York
Posts: 5,048
Quote:
Originally Posted by Celt View Post
I always liked this one which I refer to as "Old boring B&W movie about Indians".

This brings up an interesting point. What was the meaning of the numbers in the diagram? While they may be measurements of some kind, one can only imagine that it's actually a points score for a TV based bean bag toss
__________________
"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
Reply With Quote
  #9  
Old 12-28-2011, 12:47 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,610
Quote:
Originally Posted by Kamakiri View Post
This brings up an interesting point. What was the meaning of the numbers in the diagram? While they may be measurements of some kind, one can only imagine that it's actually a points score for a TV based bean bag toss
Aah, TV Indian bean bag toss a favorite among late night drinking buddies and early risers that owned protelgram projectors.
__________________
Tom C.

What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

Reading between the scan lines since the mid 2000's.
Reply With Quote
  #10  
Old 12-28-2011, 12:56 PM
jr_tech's Avatar
jr_tech jr_tech is offline
VideoKarma Member
 
Join Date: Sep 2009
Posts: 3,773
Quote:
Originally Posted by Kamakiri View Post
This brings up an interesting point. What was the meaning of the numbers in the diagram? While they may be measurements of some kind, one can only imagine that it's actually a points score for a TV based bean bag toss
I believe that they define the resolution scale in various parts of the "wedges" from 200 to 450 lines in the center and 200 to 350 at the corners

jr
Reply With Quote
Audiokarma
  #11  
Old 12-28-2011, 02:28 PM
old_tv_nut's Avatar
old_tv_nut old_tv_nut is offline
See yourself on Color TV!
 
Join Date: Jul 2004
Location: Rancho Sahuarita
Posts: 4,607
Quote:
Originally Posted by jr_tech View Post
I believe that they define the resolution scale in various parts of the "wedges" from 200 to 450 lines in the center and 200 to 350 at the corners

jr
Yes, resolution in "TV Lines per picture height." 330 lines is the most you could get on a broadcast signal with a black and white set (or color set with comb filter). Maybe 270 lines horizontal with a color set with 3.58 MHz trap.
Reply With Quote
  #12  
Old 12-28-2011, 05:37 PM
W.B. W.B. is offline
VideoKarma Member
 
Join Date: Nov 2008
Posts: 117
Quote:
Originally Posted by jr_tech View Post
I believe that they define the resolution scale in various parts of the "wedges" from 200 to 450 lines in the center and 200 to 350 at the corners
NBC, oddly enough, had a layout of their famed "bullseye" pattern in which they explained what the significance of the wedge calibration dots as positioned on each side of their horizontal and vertical wedges, were:



Alas, I haven't heard, seen or read anything about this variation being seen on the air.

NOTE: 200 TV lines = 2.5 MHz (or "mc," as it was known as of 1947).
Reply With Quote
  #13  
Old 08-25-2012, 02:22 AM
cbenham's Avatar
cbenham cbenham is offline
VideoKarma Member
 
Join Date: May 2006
Posts: 468
Quote:
Originally Posted by Celt View Post
I always liked this one which I refer to as "Old boring B&W movie about Indians".
Here's my favorite test pattern...
Cliff
Attached Images
File Type: jpg CBS Color Test Pattern .jpg (49.4 KB, 52 views)
Reply With Quote
  #14  
Old 10-09-2012, 10:34 PM
Telecruiser's Avatar
Telecruiser Telecruiser is offline
VideoKarma Member
 
Join Date: Sep 2012
Location: East Texas
Posts: 98
Google "TV Test Pattern" in their "images" area. There are a ton of them available as jpeg's. If you want to actually use one to set up your old video equipment look for a Micca Digital Media Player at Amazon.com http://www.amazon.com/Micca-MPlay-Di...keywords=micca or eleswhere. You can save the test pattern on a regular SD memory card, and the Micca player will turn it into composite video. The good news is the player is less than $30. I have one on my work bench and have a variety of test patterns and color bars stored on it. I love it.
Reply With Quote
  #15  
Old 12-20-2015, 09:20 PM
W.B. W.B. is offline
VideoKarma Member
 
Join Date: Nov 2008
Posts: 117
As I'd noted in earlier posts, the color circular test pattern design originally had two variations, coded by region as per the order of a diagonal black/white wedge at the bottom of the outer lower right quadrant. TP's with this layout:



were for stations east of the Mississippi with 'W' calls; three stations were confirmed to use it - WIBF (later WTAF and now WTXF) Channel 29 in Philadelphia, PA; WFLD Channel 32 in Chicago, IL; and WNDT (now WNET) Channel 13 in Newark, NJ / New York City (the last actually confirmed to be color). And as laid out here:



was for west of the Mississippi with 'K' calls. Only one station, to date, has been confirmed to use it, and then with a B&W print: KAET (Channel 8) in Phoenix, AZ.

My question is, how many "old-timers" on this forum remember either layout, and who else would've used either prior to the wedges at bottom right being eliminated? Certainly those stations weren't the only ones . . . ?
Reply With Quote
Audiokarma
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 12:44 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
ęCopyright 2012 VideoKarma.org, All rights reserved.