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The notes if dated June 22, 1936 is curious. Clearly the 240 line system had a narrower channel. The frequency response depicted in the second attachment does not relate to the July 1936 test and mail perhaps be a 240 line channel video aural carrier spacing which was approximately 1.5MHz. the 2.25MHz appears perhaps simply to define a reference between the sound carrier position and edge of the video response not the carrier position. Remember this is pre VSB transmission.
It appears development was moving rapidly and the decision to raise the resolution with number of lines which required wider bandwidth may have occurred rapidly. This can be gathered from the volume 1 Television.
Last edited by Penthode; 12-26-2025 at 07:58 AM.
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12-26-2025, 12:14 AM
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