Tsys forMathew's 430Mhz test feed


    A cal diode was installed on the 430 dipole of mathew's on the ch. Calixto reported that the cal at 430Mhz was 42.1 K. The system temperature was measured using the cal. The setup was:

The plots show the cal deflection and the system temperature (.ps)  (.pdf):     Tsys for the receiver is 152 K (if the cal is 42.1 K).  There is an oscillation in the cal of about 220 seconds. The cal is currently configured to use a constant voltage source. It needs to be switched to a constant current source.
processing: x101/050822/chmathews.pro