Why is there a strange diagonal "noise" appearing on my footage ?

hi
i've made a rough cut of a piece i am working on and discovered a strange diagonal noise effect on the footage. its very faint but noticable. it appears mostly on "flat" or "even" areas like sky or waters.
here are the details of the project-
shot on DV with panasonic DVX100 at 25 P 4:3 (i use pal system)
captured with sony DSR-11 set to DV PAL (default)
edited in a DV PAL sequence (default - 25 lower field).
streatched to 16X9 (nested on a 16X9 sequence and changed aspect ration to 1). turned into black and white using a monochrome filter (cant remember the name...)
exported with compressor CBR 7.4 bits, Proggressive, anamorphic, motion-best. Automatic.
built on DVD SP 3, 16X9
burned on toast 7.
is there something wrong with my workflow ?
can you think of a reason for those strange faint diagonals pulsing ? any suggestion ? maybe its my Tv (although i've never experience that before)?
i appriciate your replies and enjoy learing from you fellas...
thanx
nir evron
G5 dual 2.3 hitachi 500G HD, lacie 250G FW HD Mac OS X (10.4.2) fcp 5, dvdsp 3

My guess is that the noise showing up in the stretching and then is magnified in the monochrome step.
To check if my hunch is right, take your original 4:3 footage and run it through the Monochrome filter and then export a 10 second bit of the most offensive noise. If it doesn't go away there, then it is porbably the Filter that is creating the noise. Try a different method of making it black and white.
If it does go away, then the problem was brought in by the Stretching. To fix it, rather than stretching your footage, crop it instead. Either use a 16:9 Matt in your 4:3 space, or pull the 4:3 into the 16:9 and just enlarge it until it fits your space (you will loose a little off the top and bottom).
Hope that helps!
~Luke

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