A telescope that is observing at a centre frequency of 1.4 GHz and has a diameter of 32m.a)...

Question

A telescope that is observing at a centre frequency of 1.4 GHz and has a diameter of 32m.a) Calculate Beamwidthb) How many square degrees does this correspond to?c) How pure is this beam?d) Can we detect sources beyond it?-----A)D = 32ml = c/1400MHzl = XXXXXXXXXXm
Beamwidth = XXXXXXXXXX) / 32 = XXXXXXXXXXradiansBeamwidth = XXXXXXXXXXdegreesBeamwidth = ~28 arcminutes
B)Beamwidth = XXXXXXXXXXdegrees
Area = Pi * r^2Area = Pi * XXXXXXXXXX^2Area = XXXXXXXXXXsquare degrees
I am not sure if this is correct.
C)I don't really understand what it's asking here.
D)I think this is asking if it will pick up signals which the feed antenna via the "sidelobes" of the dish.

Robert · Accepted Answer

Problem 
A telescope that is observing at a centre frequency of 1.4 GHz and has a diameter of 32m. 
a) Calculate Beamwidth 
b) How many square degrees does this correspond to? 
c) How pure is this beam? 
d) Can we detect sources beyond it?

A telescope that is observing at a centre frequency of 1.4 GHz and has a diameter of 32m.a) Calculate Beamwidthb) How many square degrees does this correspond to?c) How pure is this beam?d) Can we...

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