The result is a signal with considerably less content, one that would fit within existing 6 MHz black-and-white signals as a phase modulated differential signal.
12.
In addition to lunar white signals, grade timed sections are sometimes indicated by a sign with the letters " GT ", or simply " T ", in white.
13.
The sync pulse is normally 40 IRE below this 0 IRE value, so the total range covered from peak to trough of an all white signal would be 140 IRE.
14.
When the train approaches each red over white signal, it would clear to yellow over white and the train stop would be lowered; and the final red signal would clear to green.
15.
CBS displayed improved versions of its original design, now using a single 6 MHz channel ( like the existing black-and-white signals ) at 144 fields per second and 405 lines of resolution.
16.
The colour scenes, restored by combining the colour signal from the off-air recording and the black and white signal from the film recording, were included as a bonus extra after the story.
17.
In the early 1990s, an early form of the Doctor Who Restoration Team attempted to pair the low-resolution colour signal from these sources with the high-resolution black-and-white signal from the black-and-white film recordings.
18.
Since the total distance between the remote camera and the base unit / TV monitor was about 50 feet and due to the limitations of the camera we used, we could get only black n white signals and that too without audio.
19.
When it became necessary to change course from an intended route, or in the event of enemy action, patrol movements were controlled by a simple semaphore flag system using blue and white signal flags, or hand signals, depending on how widely dispersed the trucks were.
20.
This was important in the early days of color television, because holding the U and V signals to zero while connecting the black and white signal to Y2 allowed color TV sets to display B & W TV without the additional expense and complexity of special B & W circuitry.
