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I recall several years ago, Accom issued a series of firmware fixes that
corrected PICTURE POSITION on the 2 bridges, so that it was unity consistent
across both conversions (no shifts in either process). This problem will, of
course, affect apparent blanking, but it was a picture phase issue.  
You might want to check into that.....
Phil Mendelson

>>                                                                    18:00 
>>  OFFICE MEMO                                                 Time:
>>                      Subject:
>>                      BLANKITY-BLANK BLANKING                       01-24-96
>>                                                              Date:
>>We have noticed an anomaly with our ACCOM D-Bridge equipment that I 
>>can't explain.  If we take a D2 signal, decode it with a D-221 and 
>>then re-encode it to D2 with a D-122, I get an extra 100-150ns of 
>Bill, I don't know if it will help, but Accom supplied us with a modified 
>PROM for the D122 to give us narrower blanking, so that we had some head 
>room for Tape to Tape, editing etc.  I seem to remember that it reduced 
>blanking to around 10.6 uS.
>Andy Toms
>NEW jobs! and equipment! at http://www.alegria.com/telecinehome.html
>...mailing list is available as a digest; inquiries to rob at alegria.com
Phil Mendelson      philm at hollydig.com
"Animals are our friends...............
but they won't take us to the airport."