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Old 1st Mar 2019, 11:47 am   #133
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 6,347
Default Re: Baird T5 restoration project.

Today's report is about the good progress I'm making with the sound and vision receiver units. The oscilloscope trace shows the negative going video present at the grid of the TSP4 video output valve. Despite having no RF amplifier the vision receiver has high gain. It has been established that the vision IF amplifier is aligned to the upper sideband which means there is a deep "trough" between the vision and sound passbands. The vision IF is 13mc/s, much higher than I thought it would have been.
Much more work needs to be done on the vision receiver but the results so far are very encouraging.

DFWB.
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