- #1
racshot65
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Hi,
I'm reading about the discovery of the cosmic microwave background radiation and don't understand this part ...
What power does a source called with liquid helium produce and how is it related to the amplifier circuits ?
I don't get what they did and why ?
Thanks !
I'm reading about the discovery of the cosmic microwave background radiation and don't understand this part ...
... It seemed likely this discrepancy was due to a slight excess of electrical noise in the amplifier circuits. In order to eliminate such problems they made use of a device know as a cold load.
The power coming from the antenna was compared with the power produced by an artificial source cooled with liquid helium.
The electrical noise in the amplifier circuit would be the same in both cases and therefore cancel out in the comparison. Allowing a direct measurement of the power coming from the antenna.
What power does a source called with liquid helium produce and how is it related to the amplifier circuits ?
I don't get what they did and why ?
Thanks !