[QuadList] TBC

[Don Norwood]

Hi Park:

It would be good to look at test signals at the output of each stage of the signal chain to determine why the Ampex machine is soft.  If the demod outputs of both machines are the same, then an analysis of what is going on with Amtec and Colortec should reveal where the softness is coming from.  If the bandwidth of the DTBC is better, then that could explain why it looks sharper, but I'd want to be certain that there isn't something wrong in the analog path of the other machine.  Could also be that the response of the DTBC is peaked beyond flat.  Test signals will reveal all!

Don
  ----- Original Message ----- 
  From: C. Park Seward 
  To: Quad List 
  Sent: Tuesday, December 08, 2009 10:20 AM
  Subject: Re: [QuadList] TBC


  The YouTube comparison was done before the 3M DOC was installed in the Ampex so you can see black line dropouts.


  There is no visible aliasing in the Ampex/Merlin. It is also a 10 bit TBC.


  The compression on YouTube makes it more difficult to see the slight picture differences. The Merlin has a slightly sharper picture while the Ampex is slightly softer. Lockup time is about the same, around two seconds.


  Best,
  Park


  C. Park Seward
  Visit us: http://www.videopark.com







  On Dec 8, 2009, at 6:52 AM, Chill315 at aol.com wrote:


    The playback in the side by side shows the quality of both.  If this is the original, you can see the difference.  The aliasing will tell you which is the Merlin machine.  The lack of a good drop out compensator will tell you which is the Ampex original.  The Ampex machine used the built in one that was included with the AFC modules.






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