NTSC Pennant?

[old_tv_nut]

how's this?

Test image: note +/- I bars and +/- Q bars in upper left (Y, I, Q all full bandwidth)


Q turned off (transmitter side, I filtered at to 1.5 Mhz bandwidth):


I turned off (transmitter side, Q filtered to 0.5 Mhz bandwidth):


Encoded and decoded with I/Q demods, subcarrier notch filter in Y channel, shows: cross color in awning; Q smear on green-magenta edge; subcarrier dots on color bar edges.


NOTE: computer simulation was simplified by making the color subcarrier phase coherent with the pixel placement in these images, resulting in the slight aspect ratio distortion seen here.

[jeyurkon]

Interesting! John

[Pete Deksnis]

Originally Posted by old_tv_nut

how's this?

Oops! (slaps forehead w/left hand) I shoulda knowed!


+I = orange

[Pete Deksnis]

Originally Posted by old_tv_nut

Encoded and decoded with I/Q demods, subcarrier notch filter in Y channel, shows: cross color in awning....

Cool! I had not noticed cross color in the awning before your pointing it out. Neat simulation.

Pete

[old_tv_nut]

Originally Posted by Pete Deksnis

Cool! I had not noticed cross color in the awning before your pointing it out. Neat simulation.

Pete

Note: most of it is in the I channel, and disappears with narrowband demods
I'm out of town and will post when I get home.