<html><body><div style="color:#000; background-color:#fff; font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:12pt"><div><span>Rick did some polarization characterisation runs on</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>18 March, at C and X band, which show a few faulty antennas.</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><br><span></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>Antenna 1, at C band, in A and B IFs - there is a large and</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier
New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>very frequency dependent leakage of the orthogonal</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>polarization into these IFs (particularly</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>A)</span><span>.</span><span> IFs C and D</span><span> look fine, so the problem is probably</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>downstream of</span><span> the horn. Contemporaneous observations at</span></div><div style="color: rgb(0, 0, 0); font-size: 16px;
font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>X band (all IFs</span><span> on antenna 1) are also fine.</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><br><span></span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>Antenna 14, at X band. All IFs - there is a large (~17%)</span></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><span>polarization leakage (antenna 14 looks fine at C band).</span></div><div> </div><div>--<br>-------------------------------------------------------<br><br></div><div>Phone:
+61-2-80651793<br>Email: rsault@nrao.edu<br>Web: http://astro.ph.unimelb.edu.au/~rsault</div></div></body></html>