I am building an amateur radio telescope and am considering adding a cryogenic cooling system to the LNA.
Information about how to build my own liquid nitrogen plant would be appreciated as well, although I have found some information in a google search.
What amount of LN2 would I need to produce for, say, 4-5 hours of observations per night? Would about 1.5L be enough?
I am doing this to learn about cryogenic electronics more so than getting better performance (- it's certainly not covered in my course), which I think will be marginal, since I live in the city. The scope will be observing at the Hi line, 1420 MHz.
You need a dewar. Please go to this link.
http://www.infraredlaboratories.com/ND_Series_Dewars.html
ND-3 has hold time of 24 hrs for LN2. Capacilty of LN2 is 0.5 liters. Due to evaporation during filling, I would estimate that you need at least 4 times of that amount, say 2 litres of LN2.
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