Receiver crosshead modulation of the gain.


     Total power data was taken with the xband receiver. A 40 Mhz band at 8800 Mhz was square law detected with a 20 millisecond time constant and then sampled at 100 hz with the 12 bit A/D converters. About 40 seconds of data was taken. The plot shows a 1.2 hz variation in the total power. 1.2 Hz is the period of the crosshead used to cool the amplifier. This variation should be checked on the other receivers.
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