[QuadList] TRT 1 Color Standards

[Chill315 at aol.com]

After the discussion of color in the early days, I did a look up of the  
tape format that RCA used.
 
The first version of the TRT has two record standards.  One being the  
Lo-Band mono that is the same as the current standard.  They had a color  format 
that had the frequencies of 5.4 MHz to 6.3 MHz with a pre-emphasis of  9.54 
db.  This was close to the final LO-Band Color of 5.5 to 6.5
 
The real problem was the emphasis curve.  In the TRT-1B the demod had  a 
center position for the early color recordings.  It was called VAR.   I always 
wondered what this was used for.  This group has provided the  answer in 
the history of the RCA machines.
 
Now the Heterodyne system was a playback system only.  The color was  
recorded directly.  It used a system that created a signal comparing the  jitter 
of the sub carrier off tape to the house 3.58.  This signal was  changed in 
frequency to create a signal corresponding to the jitter.  The  jitter error 
was canceled and the result was heterodyned back to normal.
 
The Non-Phased color mode of the Colortec was used to playback a dub that  
had been made using this system.  
 
Information was obtained from RCA schematics and Television Broadcasting  
Tape Recording Systems by Ennes.
 
Chris Hill
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