| 1. | An amplifier with a 0 dB noise figure would be perfect.
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| 2. | Thus, the noise figure of tube amplifiers increases with frequency.
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| 3. | The noise figure in this case is 20 dB.
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| 4. | In most cases only the noise figure of the first stage need be considered.
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| 5. | The total noise factor can then be used to calculate the total noise figure.
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| 6. | To obtain low noise figure the impedance of the source can be increased by a transformer.
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| 7. | At 800 MHz, tubes like EC8010 have noise figures of about 10 dB or more.
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| 8. | To obtain low noise figure, the impedance of the source can be increased by a transformer.
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| 9. | From those measurements and the characteristics of the noise source, the noise figure can be calculated.
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| 10. | Noise generators are used to test signals for measuring noise figure, frequency response, and other parameters.
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