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<DIV>After the discussion of color in the early days, I did a look up of the
tape format that RCA used.</DIV>
<DIV> </DIV>
<DIV>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</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>The Non-Phased color mode of the Colortec was used to playback a dub that
had been made using this system. </DIV>
<DIV> </DIV>
<DIV>Information was obtained from RCA schematics and Television Broadcasting
Tape Recording Systems by Ennes.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV></FONT><DIV CLASS="aol_ad_footer" ID="df91bebcff20bdc63e729d51948724cc"><br/><font style="color:black;font:normal 10pt arial,san-serif;"> <hr style="margin-top:10px"/>Access 350+ FREE radio stations anytime from anywhere on the web. <a href="http://toolbar.aol.com/aolradio/download.html?ncid=emlcntusdown00000003">Get the Radio Toolbar</a>!</font></DIV></BODY></HTML>