P r i m a L u c e L a b i S r l
S p i d e r 2 3 0 u s e r m a n u a l
2)
Receiver optimization
: because of the needed high gains, especially for the recording objects outside of Solar Sy-
stem, it is absolutely critical to capture data at a constant working temperature. in order to do this, the RAL10PL
receiver has an internal heater with an electronic stabilization system that brings the receiver temperature at 44°C
and maintain it with 0.1°C accuracy. Therefore we recommend to pay attention to the constancy of the temperatu-
re (which can be read in the top left part of RadioUniverse, close to the value of radio emission). In fact a not con-
trolled variation of temperature will cause a change in the value recorded radio that can be confused with a real
radio emission.
For proper operation of the RAL10PL heater, it is recommended that the ambient temperature does not exceed
35°C. If, during the hot summer days, the direct light of the sun warms the receiver box to very high values and the
temperature reading is above 44°C, it is advisable to open the receiver box to allow air to cool it slightly. You can
also place, on top of the receiver, an object large enough to keep the receiver under shadow. If not enough, you can
place a fan that constantly blows air inside the RAL10PL box. Then wait for the temperature to stabilize at 44°C to
start the recordings.
The graph below was recorded by keeping Spider230 pointed towards the North Star (thus always to the same
point in the sky that does not have radio sources recordable from the radio telescope) for 8 hours. The recording
was made under optimum atmospheric conditions, without any cloud in all the recording period. The blue line sho-
ws the variation of the signal recorded as a function of the working temperature of the receiver (red line) and the
one of the environment (green line).
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