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In reviewing my considerable body of observations of the Moon with our P-band system, it was clear that ea25 had a very high cross-polarization, which was not due to the usual feed dipole rotation. (This can be distinguished because rotation provides a `real'
D-term (real meaning as in complex numbers), and ea25's D-terms had a very large imaginary component). Only ea25 behaved this way – all others provided the usual 'real-dominated' D-terms. And, over time, it was clear that this cross-polarization was getting
worse. </div>
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A week ago Monday, after inspection of the dipoles revealed no abnormalities, the receiver was replaced. </div>
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Lilia set up a short observation yesterday of 3C147 and DA240, which allows a full calibration to be done.</div>
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<b>Result: The cross-polarization of ea25 is now completely normal. </b></div>
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Suggestion: Somebody should look at the receiver to see if the origin of the leakages between the signal channels can be found.</div>
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Rick and Lilia</div>
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