RESULTS OF STUDIES OF TWO RAYTHEON QK411A STORAGE TUBES.
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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Two Raytheon QK411A electrical input-output storage tubes were investigated with regard to resolution, uniformity, storage time, and dynamic range. One of the tubes is far superior to the other in many respects but exhibits a much shorter reading time. Both tubes have a resolution capability of approximately 200 TV lines at 100 per cent contrast. Uniformity is poor in these tubes, being no better than plus or minus 15 per cent in the better tube. Write and erase times were observed to be much less than one second however, priming time at 20 microamps cathode current was observed to be approximately one second. Cut off characteristics of the storage surface in the two tubes differed, though the dynamic range under the same operating conditions was observed to be very similar. The dynamic range of the tubes is very low at radar sweep speeds, which results in the need for extremely good bias and clamping circuits at the signal grid to prevent loss of low level signals. Author
- Electrical and Electronic Equipment