Attached are data from 212 and 274 GHz with no grids: 4133.GIF 4133b.GIF
  4134.GIF 4134b.GIF

Grid was placed over the Duommun horn, but the cross-pol level remained around 17.5 dB:

4136.GIF 4136b.GIF

The horn was cleaned and the aperture reshaped by the shop (grid remained over horn) and levels reduced to -23.5 dB:

4138.GIF 4138b.GIF

Placed grid over both transmit and receive horns:

4143.GIF 4143b.GIF

We checked linearity using a section of Marconi absorber (~ 25 dB insertion loss) and confirmed that the power meter, spectrum analyzer, and network analyzer all measured the same relative power. Dynamic range was checked by placing block of CV-3 absorber over horn. Dynamic range was > 40 dB on Network Analyzer.


Replaced Ducommun horn with CMI Standard Gain Horn.

Measurement of CMI Horn HO3R (co-pol):

4150.GIF 4150b.GIF

Crosspol results for the pyrimidal horn look suspiciously similar to all previous data. I think the title here is incorrect and the grid was only on the TX for this measurement.

4149.GIF 4149b.GIF
2009-05-05 Remeasurement of above. Note coordinate system change. 4169.GIF 4169b.GIF

Excel 2007 software was upgraded to plot this data and that file is \\cvfiler\cv-cdl-sis\CartTstData\Cart6.008productionTSTdata\Warm Patterns\Xpol243GHz.xlsm

-- JohnEffland - 2009-05-01

Topic attachments
I Attachment Action Size Date Who Comment
SIS-20090501b.GIFGIF SIS-20090501b.GIF manage 81 K 2009-05-01 - 16:27 JohnEffland  
SIS-20090501c.GIFGIF SIS-20090501c.GIF manage 119 K 2009-05-01 - 16:28 JohnEffland  
SIS-20090501h.GIFGIF SIS-20090501h.GIF manage 71 K 2009-05-01 - 17:15 JohnEffland  
SIS-20090501k.GIFGIF SIS-20090501k.GIF manage 95 K 2009-05-01 - 17:20 JohnEffland  
SIS-20090504a.GIFGIF SIS-20090504a.GIF manage 117 K 2009-05-04 - 08:29 JohnEffland  
This topic: ALMA > Band6Cartridges > WarmBeamPatternMeasurements
Topic revision: 2009-05-05, JohnEffland
This site is powered by FoswikiCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding NRAO Public Wiki? Send feedback